FILED PURSUANT TO RULE 424(b)(2)
REGISTRATION NO. 333-133858


PROSPECTUS SUPPLEMENT DATED OCTOBER 12,2006
TO PROSPECTUS DATED MAY 5,2006 AND
PROSPECTUS SUPPLEMENT DATED AUGUST 28,2006

This prospectus is not an offer to sell these securities and it is not
soliciting an offer to buy these securities in any state where the offer
or sale is not permitted.



                      RESEARCH FRONTIERS INCORPORATED

                      179,487 Shares of Common Stock


                           -------------------


Research Frontiers Incorporated is selling to three accredited investors a
total of 179,487 shares of common stock.  This offering is part of a "shelf"
registration statement that we have filed with the Securities and Exchange
Commission which was declared effective by the SEC on May 25, 2006.The shelf
registration statement covers the issuance of up to 2,000,000 shares of common
stock, and/or warrants to purchase such common stock. Each time that we sell our
securities under the registration statement, we will issue a prospectus
supplement like this one, which includes the terms of the offering such as the
price, terms and amount of securities being sold. We may sell these securities
to or through underwriters and also to other purchasers or through agents. We
will set forth the names of any underwriters or agents in the accompanying
prospectus supplement.

    Our common stock is listed on the Nasdaq Capital Market under the
symbol "REFR." The last reported sale price of our common stock on the
Nasdaq Capital Market on October 11, 2006 was $4.37.

                               -------------------

     Investing in our common stock involves a high degree of risk. See "Risk
Factors" beginning on page 3.

                               -------------------

     Neither the Securities and Exchange Commission nor any State Securities
Commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                               -------------------

                              Per Share(1)         Total Offering
Public Offering Price:             $3.90           $700,000.00
Proceeds, before expenses, to us:  $3.90           $700,000.00

Delivery of the shares of common stock to all of the purchasers
is expected to be made on or about October 12, 2006.



   The date of this prospectus supplement is October 12,2006



                  ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement, the accompanying prospectus supplement
dated August 28, 2006, and the accompanying base prospectus dated
May 5, 2006 are part of a "shelf" registration statement that we
have filed with the Securities and Exchange Commission, or SEC. Each time
we sell securities under the accompanying base prospectus we will
provide a prospectus supplement that will contain specific information
about the terms of that offering, including the price, the amount of
common stock being offered and the plan of distribution. The shelf
registration was declared effective by the SEC on May 25, 2006.
This prospectus supplement describes the specific details regarding
this offering, including the price, the amount of common stock being
offered, the risks of investing in our common stock and the plan
of distribution. The accompanying base prospectus provides general
information about us, some of which, such as the section entitled
"Plan of Distribution," may not apply to this offering.

If information in this prospectus supplement is inconsistent with
the accompanying base prospectus or the information incorporated
by reference, you should rely on this prospectus supplement. You
should read both this prospectus supplement and the accompanying
base prospectus together with the additional information about
Research Frontiers Incorporated to which we refer you in the
section of this prospectus supplement entitled "Available Information."

                              SUMMARY

You should read the entire prospectus, including the section entitled
"Risk Factors," carefully before making an investment decision.

                            THE COMPANY

     Research Frontiers Incorporated ("Research Frontiers" or the
"Company") develops and licenses its suspended particle technology for
controlling the amount of light passing through a device. Such
suspended particle devices are often referred to as "SPDs," "light
valves," or "SPD-Smart" products.

     SPDs use microscopic light-absorbing particles that are either in
a liquid suspension or a film. The microscopic particles align when an
electrical voltage is applied.  This permits light to pass through the
device, and allows the amount of light to be controlled. Our offices
are located at: 240 Crossways Park Drive, Woodbury, NY 11797
(telephone: 516-364-1902).

                            THE OFFERING

Common Stock issued by Research Frontiers:     179,487 shares
Common Stock Outstanding after this offering:  14,507,508 shares
Use of Proceeeds:                              general corporate purposes
Nasdaq Capital Market Symbol:                  REFR

The number of shares of common stock outstanding after this offering is
based upon 14,328,021 shares outstanding as of October 11,2006. It
excludes outstanding options and warrants to purchase 2,965,093
shares of common stock, and options or other equity awards for
816,779 shares available for future issuance pursuant to the
Company's 1998 Stock Option Plan.

                           RISK FACTORS

         In addition to the other information in this prospectus, you should
carefully consider the following factors in evaluating us and our business
before purchasing the shares of common stock offered hereby. This prospectus
contains, in addition to historical information, forward-looking statements that
involve risks and uncertainties. Our actual results could differ materially.
Factors that could cause or contribute to such differences include, but are not
limited to, those discussed below, as well as those discussed elsewhere in this
prospectus, including the documents incorporated by reference.

There are risks associated with investing in companies such as ours who
are engaged in research and development.  Because of these risks, you
should only invest if you are able to bear the risk of losing your entire
investment.  Before investing, in addition to risks which could apply to
any issuer or offering, you should also consider the business we are in
and the following:

Research Frontiers has a history of operating losses, expects to incur
additional losses in the future, and consequently will need additional
funds in the future to continue its operations.  To date, Research
Frontiers has lost money, and we expect to lose money in the
foreseeable future.  Because we expect that our future revenues will
consist primarily of license fees (which have not been significant to date),
unless our licensees produce and sell products using our technology,
Research Frontiers will not be profitable. There is no guarantee
that we will ever be profitable. Since Research Frontiers was started
in 1965 through December 31, 2005, its total net loss was $58,932,898.
In 2005 our net loss was $3,747,532 and was $4,262,741 in 2004.

We have funded our operations by selling our common stock to investors.
If we need additional money, there is no guarantee that it will be available
when we need it, or on favorable terms. Without giving effect to the
proceeds received from this offering, the Company would have had to raise
additional capital no later than the middle of 2007 if operations,
including research and development and marketing, were to be maintained
at current levels. After giving effect to the net proceeds received from
this offering, the Company would not have to raise additional capital
until mid-to-late 2007. Eventual success of the Company and generation of
positive cash flow will be dependent upon the extent of commercialization
of products using the Company's technology by the Company's licensees
and payments of continuing royalties on account thereof.

Research Frontiers depends upon the activities of its licensees in order
to be profitable.  We do not directly manufacture or market products
using SPD technology.  Although a variety of products have been sold by our
licensees, and since it is up to our licensees to decide when and if they
will introduce products using SPD technology, we cannot predict when
and if our licensees will generate substantial sales of such products.
Research Frontiers' SPD technology is currently licensed to 35 companies.
Other companies are also evaluating the technology for use in various
products. In the past, some companies have evaluated our technology
without proceeding further.  Also, we do not intend to manufacture
products using SPD technology.  Instead we intend to continue to
license our technology to manufacturers of end products, films and emulsion.
We expect that our licensees would be primarily responsible for marketing
and manufacturing, but we are also engaging in market development activities.

Products using SPD technology have only recently been introduced into the
marketplace.  Developing products using new technologies can be risky
because problems, expenses and delays frequently occur.  Research
Frontiers cannot control whether or not its licensees will develop SPD
products.  Some of our licensees appear to be more active than others, some
appear to be better capitalized than others, and some licensees appear
to be inactive. There is no guarantee when or if our licensees will
successfully produce any commercial product using SPD technology.

SPD technology is the only technology Research Frontiers works with,
so that our success depends upon the viability of SPD technology which
has yet to be proven. We have not fully ascertained the performance and
long-term reliability of our technology, and therefore there is no
guarantee that our technology will successfully be incorporated into all
of the products which we are targeting for use of SPD technology. We
expect that different product applications for SPD technology will have
different performance and reliability specifications.  For example, SPD
eyewear requiring batteries may need to use lower voltages than SPD
windows used in homes or offices, yet may not need to last as long or be
exposed to as harsh an environment. We expect that our licensees will
primarily be responsible for reliability testing, but that we may also
continue to do reliability testing so that we can more effectively focus
our research and development efforts towards constantly improving the
performance characteristics and reliability of products using SPD technology.

                       AVAILABLE INFORMATION

Research Frontiers  files reports, proxy statements and other information
with the Securities and Exchange Commission. You may read and copy
such reports, proxy statements and other information at the public
reference room maintained by the SEC at 100 F Street, N.E.,
Washington, D.C. 20549 and you can obtain information on the operation
of the Public Reference Room by calling the SEC at 1-800-SEC-0330.
The SEC also maintains an internet web site at http://www.sec.gov
that contains reports, proxy and information statements and other
information regarding issuers,  such as Research Frontiers, that
file electronically with the SEC.  Additional information about us
can also be found at our web site at http://www.SmartGlass.com.

The SEC allows us to incorporate by reference the information we file
with them, which means that we can disclose important information to
you by referring you to those documents.  The information incorporated
by reference is considered to be part of this prospectus, and later
information that we file with the SEC will automatically update and
supersede this information.  We incorporate by reference into this
prospectus our:

o   annual report on Form 10-K for the fiscal year
    ended December 31, 2005,
o   the portions of the proxy statement dated April 30, 2006 for our
    annual meeting of stockholders held on June 8, 2006 that
    have been incorporated by reference into our report on Form 10-K
    for the fiscal year ended December 31, 2005,
o   quarterly report on Form 10-Q for the fiscal quarter
    ended March 31, 2006 and June 30, 2006,
o   current reports on Form 8-K dated May 15, 2006, June 8, 2006 and
    August 28, 2006,and
o   any future filings after effectiveness of the registration statement made
    with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Securities
    Exchange Act of 1934 until all of the common stock offered under this
    prospectus is sold.

All filings filed by Research Frontiers pursuant to the Exchange Act after the
date of the initial registration statement and prior to effectiveness
of the registration statement shall be deemed to be incorporated by reference
into this prospectus.

This prospectus is part of a registration statement we filed with the SEC.
As permitted by the SEC, this prospectus does not contain all of the
information set forth in the registration statement and the exhibits and
schedules thereto.  The statements contained in this prospectus as to the
contents of any contract or any other document are not necessarily
complete.  In each case you should refer to the copy of such contract or
document filed as an exhibit to the registration statement.

We will provide each person to whom this prospectus is delivered, a
copy of any information we have incorporated by reference but have not
delivered along with this prospectus. If you would like a copy of any
document incorporated herein by reference, other than exhibits unless
such exhibits are specifically incorporated by reference in any such
document, you can call or write to us at our  principal executive offices:
240 Crossways Park Drive, Woodbury, New York 11797-2033,
Attention: General Counsel (telephone: (516) 364-1902). We will
provide this information without charge to any person, including a
beneficial owner, to whom a copy of this prospectus is delivered upon
written or oral request.

No dealer, salesperson or other individual has been authorized to give
any information or to make any representation not contained in or
incorporated by reference in this prospectus or in any supplement to this
prospectus.  If given or made, you must not rely on such information or
representation as having been authorized by Research Frontiers. Neither
the delivery of this prospectus nor any sale made hereunder will,
under any circumstances, create an implication that there has not been
any change in the affairs of Research Frontiers since the date of this
prospectus or that the information contained herein is correct
or complete as of any time after the date of this prospectus.

This prospectus and any supplement to this prospectus do not constitute
an offer to sell or a solicitation of an offer to buy any securities offered
hereby to any person, or by anyone, in any jurisdiction in which such
offer or solicitation may not lawfully be made.

The information set forth herein and in all publicly disseminated
information about Research Frontiers, includes "forward-looking
statements" within the meaning of Section 21E of the Securities
Exchange Act of 1934, as amended, and is subject to the safe harbor
created by that section. Readers are cautioned not to place undue
reliance on these forward-looking statements as they speak only as of the
date of this prospectus and are not guaranteed.

                             DIVIDENDS

Research Frontiers has never paid any cash dividends and does not
expect to pay any cash dividends for the foreseeable future.

                          USE OF PROCEEDS

We currently intend to use the net proceeds from this offering for general
corporate purposes, including our internal research and development
programs, general working capital and possible future acquisitions.

We have not determined the amounts we plan to spend on any of the areas listed
above or the timing of these expenditures. As a result, our management will have
broad discretion to allocate the net proceeds from this offering. Pending
application of the net proceeds as described above, we intend to invest the net
proceeds of the offering in money market funds and other interest-bearing
investments.

                    DESCRIPTION OF SECURITIES

   We may sell from time to time, in one or more offerings common stock and/or
warrants to purchase common stock.

DESCRIPTION OF COMMON STOCK

Research Frontiers can issue 100,000,000 shares of common stock,
$0.0001 par value per share. 14,507,508 shares were outstanding as
of the date of this prospectus after giving effect to the shares issued in
this offering. Holders of common stock are entitled to one vote per
share on matters submitted to shareholders for their approval, to
dividends if declared by Research Frontiers, and to share in any
distribution of Research Frontiers' assets.  All outstanding shares of
common stock are fully paid for and non-assessable.  Holders of
common stock do not have cumulative voting rights or preemptive
rights.  Therefore, a minority stockholder may be less able to gain
representation on Research Frontiers' board of directors.

Listing

Our common stock is listed on the Nasdaq Capital Market under the symbol "REFR".

Transfer Agent and Registrar

Continental Stock Transfer and Trust Company is the transfer agent and registrar
for our common stock.

                       PLAN OF DISTRIBUTION

The Company directly placed the Shares with the purchaser without a
placement agent.

The Company will receive net proceeds of $700,000 from
the sale of 179,487 shares of Common Stock at a price of
$3.90 per share.

The form of Subscription Agreement is included as
an exhibit to our Current Report on Form 8-K that was filed
with the Securities and Exchange Commission on October 12, 2006.

The transfer agent for our common stock is Continental Stock
Transfer & Trust Company.

Our common stock is traded on the Nasdaq Capital Market
under the symbol "REFR".

--------------------------------------------------------------------------------
FILED PURSUANT TO RULE 424(b)(2)
REGISTRATION NO. 333-133858


PROSPECTUS SUPPLEMENT DATED AUGUST 28,2006
TO PROSPECTUS DATED MAY 5,2006

This prospectus is not an offer to sell these securities and it is not
soliciting an offer to buy these securities in any state where the offer
or sale is not permitted.



                      RESEARCH FRONTIERS INCORPORATED

                      515,462 Shares of Common Stock


                           -------------------


Research Frontiers Incorporated is selling to accredited investor a total of
515,462 shares of common stock.  This offering is part of a "shelf"
registration statement that we have filed with the Securities and Exchange
Commission which was declared effective by the SEC on May 25, 2006.The shelf
registration statement covers the issuance of up to 2,000,000 shares of common
stock, and/or warrants to purchase such common stock. Each time that we sell our
securities under the registration statement, we will issue a prospectus
supplement like this one, which includes the terms of the offering such as the
price, terms and amount of securities being sold. We may sell these securities
to or through underwriters and also to other purchasers or through agents. We
will set forth the names of any underwriters or agents in the accompanying
prospectus supplement.

    Our common stock is listed on the Nasdaq Capital Market under the
symbol "REFR." The last reported sale price of our common stock on the
Nasdaq Capital Market on August 25, 2006 was $4.14.

                               -------------------

     Investing in our common stock involves a high degree of risk. See "Risk
Factors" beginning on page 3.

                               -------------------

     Neither the Securities and Exchange Commission nor any State Securities
Commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                               -------------------

                              Per Share(1)         Total Offering
Public Offering Price:             $3.88           $2,000,000.00
Proceeds, before expenses, to us:  $3.88           $2,000,000.00

Delivery of the shares of common stock to all of the purchasers
is expected to be made on or about August 28, 2006.



   The date of this prospectus supplement is August 28,2006



                  ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement and the accompanying base prospectus dated
May 5, 2006 are part of a "shelf" registration statement that we
have filed with the Securities and Exchange Commission, or SEC. Each time
we sell securities under the accompanying base prospectus we will
provide a prospectus supplement that will contain specific information
about the terms of that offering, including the price, the amount of
common stock being offered and the plan of distribution. The shelf
registration was declared effective by the SEC on May 25, 2006.
This prospectus supplement describes the specific details regarding
this offering, including the price, the amount of common stock being
offered, the risks of investing in our common stock and the plan
of distribution. The accompanying base prospectus provides general
information about us, some of which, such as the section entitled
"Plan of Distribution," may not apply to this offering.

If information in this prospectus supplement is inconsistent with
the accompanying base prospectus or the information incorporated
by reference, you should rely on this prospectus supplement. You
should read both this prospectus supplement and the accompanying
base prospectus together with the additional information about
Research Frontiers Incorporated to which we refer you in the
section of this prospectus supplement entitled "Available Information."

                              SUMMARY

You should read the entire prospectus, including the section entitled
"Risk Factors," carefully before making an investment decision.

                            THE COMPANY

     Research Frontiers Incorporated ("Research Frontiers" or the
"Company") develops and licenses its suspended particle technology for
controlling the amount of light passing through a device. Such
suspended particle devices are often referred to as "SPDs," "light
valves," or "SPD-Smart" products.

     SPDs use microscopic light-absorbing particles that are either in
a liquid suspension or a film. The microscopic particles align when an
electrical voltage is applied.  This permits light to pass through the
device, and allows the amount of light to be controlled. Our offices
are located at: 240 Crossways Park Drive, Woodbury, NY 11797
(telephone: 516-364-1902).

                            THE OFFERING

Common Stock issued by Research Frontiers:     515,462 shares
Common Stock Outstanding after this offering:  14,328,021 shares
Use of Proceeeds:                              general corporate purposes
Nasdaq Capital Market Symbol:                  REFR

The number of shares of common stock outstanding after this offering is
based upon 13,812,559 shares outstanding as of August 25,2006. It
excludes outstanding options and warrants to purchase 2,965,093
shares of common stock, and options or other equity awards for
816,779 shares available for future issuance pursuant to the
Company's 1998 Stock Option Plan.

                           RISK FACTORS

         In addition to the other information in this prospectus, you should
carefully consider the following factors in evaluating us and our business
before purchasing the shares of common stock offered hereby. This prospectus
contains, in addition to historical information, forward-looking statements that
involve risks and uncertainties. Our actual results could differ materially.
Factors that could cause or contribute to such differences include, but are not
limited to, those discussed below, as well as those discussed elsewhere in this
prospectus, including the documents incorporated by reference.

There are risks associated with investing in companies such as ours who
are engaged in research and development.  Because of these risks, you
should only invest if you are able to bear the risk of losing your entire
investment.  Before investing, in addition to risks which could apply to
any issuer or offering, you should also consider the business we are in
and the following:

Research Frontiers has a history of operating losses, expects to incur
additional losses in the future, and consequently will need additional
funds in the future to continue its operations.  To date, Research
Frontiers has lost money, and we expect to lose money in the
foreseeable future.  Because we expect that our future revenues will
consist primarily of license fees (which have not been significant to date),
unless our licensees produce and sell products using our technology,
Research Frontiers will not be profitable. There is no guarantee
that we will ever be profitable. Since Research Frontiers was started
in 1965 through December 31, 2005, its total net loss was $58,932,898.
In 2005 our net loss was $3,747,532 and was $4,262,741 in 2004.

We have funded our operations by selling our common stock to investors.
If we need additional money, there is no guarantee that it will be available
when we need it, or on favorable terms. Without giving effect to the
proceeds received from this offering, the Company would have had to raise
additional capital no later than the first quarter of 2007 if operations,
including research and development and marketing, were to be maintained
at current levels. After giving effect to the net proceeds received from
this offering, the Company would not have to raise additional capital
until mid-2007. Eventual success of the Company and generation of
positive cash flow will be dependent upon the extent of commercialization
of products using the Company's technology by the Company's licensees
and payments of continuing royalties on account thereof.

Research Frontiers depends upon the activities of its licensees in order
to be profitable.  We do not directly manufacture or market products
using SPD technology.  Although a variety of products have been sold by our
licensees, and since it is up to our licensees to decide when and if they
will introduce products using SPD technology, we cannot predict when
and if our licensees will generate substantial sales of such products.
Research Frontiers' SPD technology is currently licensed to 35 companies.
Other companies are also evaluating the technology for use in various
products. In the past, some companies have evaluated our technology
without proceeding further.  Also, we do not intend to manufacture
products using SPD technology.  Instead we intend to continue to
license our technology to manufacturers of end products, films and emulsion.
We expect that our licensees would be primarily responsible for marketing
and manufacturing, but we are also engaging in market development activities.

Products using SPD technology have only recently been introduced into the
marketplace.  Developing products using new technologies can be risky
because problems, expenses and delays frequently occur.  Research
Frontiers cannot control whether or not its licensees will develop SPD
products.  Some of our licensees appear to be more active than others, some
appear to be better capitalized than others, and some licensees appear
to be inactive. There is no guarantee when or if our licensees will
successfully produce any commercial product using SPD technology.

SPD technology is the only technology Research Frontiers works with,
so that our success depends upon the viability of SPD technology which
has yet to be proven. We have not fully ascertained the performance and
long-term reliability of our technology, and therefore there is no
guarantee that our technology will successfully be incorporated into all
of the products which we are targeting for use of SPD technology. We
expect that different product applications for SPD technology will have
different performance and reliability specifications.  For example, SPD
eyewear requiring batteries may need to use lower voltages than SPD
windows used in homes or offices, yet may not need to last as long or be
exposed to as harsh an environment. We expect that our licensees will
primarily be responsible for reliability testing, but that we may also
continue to do reliability testing so that we can more effectively focus
our research and development efforts towards constantly improving the
performance characteristics and reliability of products using SPD technology.

                       AVAILABLE INFORMATION

Research Frontiers  files reports, proxy statements and other information
with the Securities and Exchange Commission. You may read and copy
such reports, proxy statements and other information at the public
reference room maintained by the SEC at 100 F Street, N.E.,
Washington, D.C. 20549 and you can obtain information on the operation
of the Public Reference Room by calling the SEC at 1-800-SEC-0330.
The SEC also maintains an internet web site at http://www.sec.gov
that contains reports, proxy and information statements and other
information regarding issuers,  such as Research Frontiers, that
file electronically with the SEC.  Additional information about us
can also be found at our web site at http://www.SmartGlass.com.

The SEC allows us to incorporate by reference the information we file
with them, which means that we can disclose important information to
you by referring you to those documents.  The information incorporated
by reference is considered to be part of this prospectus, and later
information that we file with the SEC will automatically update and
supersede this information.  We incorporate by reference into this
prospectus our:

o   annual report on Form 10-K for the fiscal year
    ended December 31, 2005,
o   the portions of the proxy statement dated April 30, 2006 for our
    annual meeting of stockholders held on June 8, 2006 that
    have been incorporated by reference into our report on Form 10-K
    for the fiscal year ended December 31, 2005,
o   quarterly report on Form 10-Q for the fiscal quarter
    ended March 31, 2006 and June 30, 2006,
o   current reports on Form 8-K dated May 15, 2006 and June 8, 2006,and
o   any future filings after effectiveness of the registration statement made
    with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Securities
    Exchange Act of 1934 until all of the common stock offered under this
    prospectus is sold.

All filings filed by Research Frontiers pursuant to the Exchange Act after the
date of the initial registration statement and prior to effectiveness
of the registration statement shall be deemed to be incorporated by reference
into this prospectus.

This prospectus is part of a registration statement we filed with the SEC.
As permitted by the SEC, this prospectus does not contain all of the
information set forth in the registration statement and the exhibits and
schedules thereto.  The statements contained in this prospectus as to the
contents of any contract or any other document are not necessarily
complete.  In each case you should refer to the copy of such contract or
document filed as an exhibit to the registration statement.

We will provide each person to whom this prospectus is delivered, a
copy of any information we have incorporated by reference but have not
delivered along with this prospectus. If you would like a copy of any
document incorporated herein by reference, other than exhibits unless
such exhibits are specifically incorporated by reference in any such
document, you can call or write to us at our  principal executive offices:
240 Crossways Park Drive, Woodbury, New York 11797-2033,
Attention: General Counsel (telephone: (516) 364-1902). We will
provide this information without charge to any person, including a
beneficial owner, to whom a copy of this prospectus is delivered upon
written or oral request.

No dealer, salesperson or other individual has been authorized to give
any information or to make any representation not contained in or
incorporated by reference in this prospectus or in any supplement to this
prospectus.  If given or made, you must not rely on such information or
representation as having been authorized by Research Frontiers. Neither
the delivery of this prospectus nor any sale made hereunder will,
under any circumstances, create an implication that there has not been
any change in the affairs of Research Frontiers since the date of this
prospectus or that the information contained herein is correct
or complete as of any time after the date of this prospectus.

This prospectus and any supplement to this prospectus do not constitute
an offer to sell or a solicitation of an offer to buy any securities offered
hereby to any person, or by anyone, in any jurisdiction in which such
offer or solicitation may not lawfully be made.

The information set forth herein and in all publicly disseminated
information about Research Frontiers, includes "forward-looking
statements" within the meaning of Section 21E of the Securities
Exchange Act of 1934, as amended, and is subject to the safe harbor
created by that section. Readers are cautioned not to place undue
reliance on these forward-looking statements as they speak only as of the
date of this prospectus and are not guaranteed.

                             DIVIDENDS

Research Frontiers has never paid any cash dividends and does not
expect to pay any cash dividends for the foreseeable future.

                          USE OF PROCEEDS

We currently intend to use the net proceeds from this offering for general
corporate purposes, including our internal research and development
programs, general working capital and possible future acquisitions.

We have not determined the amounts we plan to spend on any of the areas listed
above or the timing of these expenditures. As a result, our management will have
broad discretion to allocate the net proceeds from this offering. Pending
application of the net proceeds as described above, we intend to invest the net
proceeds of the offering in money market funds and other interest-bearing
investments.

                    DESCRIPTION OF SECURITIES

   We may sell from time to time, in one or more offerings common stock and/or
warrants to purchase common stock.

DESCRIPTION OF COMMON STOCK

Research Frontiers can issue 100,000,000 shares of common stock,
$0.0001 par value per share. 14,328,021 shares were outstanding as
of the date of this prospectus after giving effect to the shares issued in
this offering. Holders of common stock are entitled to one vote per
share on matters submitted to shareholders for their approval, to
dividends if declared by Research Frontiers, and to share in any
distribution of Research Frontiers' assets.  All outstanding shares of
common stock are fully paid for and non-assessable.  Holders of
common stock do not have cumulative voting rights or preemptive
rights.  Therefore, a minority stockholder may be less able to gain
representation on Research Frontiers' board of directors.

Listing

Our common stock is listed on the Nasdaq Capital Market under the symbol "REFR".

Transfer Agent and Registrar

Continental Stock Transfer and Trust Company is the transfer agent and registrar
for our common stock.

                       PLAN OF DISTRIBUTION

The Company directly placed the Shares with the purchaser without a
placement agent.

The Company will receive net proceeds of $2,000,000 from
the sale of 515,462 shares of Common Stock at a price of
$3.88 per share.

The form of Subscription Agreement is included as
an exhibit to our Current Report on Form 8-K that was filed
with the Securities and Exchange Commission on August 28, 2006.

The transfer agent for our common stock is Continental Stock
Transfer & Trust Company.

Our common stock is traded on the Nasdaq Capital Market
under the symbol "REFR".

--------------------------------------------------------------------------------


This information in this prospectus is not complete and may be changed. We may
not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an
offer to sell these securities and it is not soliciting an offer to buy these
securities in any state where the offer or sale is not permitted.

                                   PROSPECTUS

                                DATED MAY 5, 2006


                               2,000,000 Shares

                                 Common Stock

                               -------------------


Research Frontiers Incorporated may from time to time issue up to 2,000,000
shares of  common stock, and/or warrants to purchase such common stock.
A general description of the known material terms of the securities we
are offering is included herein. We will specify in an accompanying prospectus
supplement any specific material terms of the securities offered which are
unknown as of the date of this prospectus. We may sell these securities to
or through underwriters and also to other purchasers or through agents.
We will set forth the names of any underwriters or agents in the
accompanying prospectus supplement.

    Our common stock is listed on the Nasdaq Capital Market under the
symbol "REFR." The last reported sale price of our common stock on the
Nasdaq Capital Market on April 28, 2006 was $5.45.

                               -------------------

     Investing in our common stock involves a high degree of risk. See 'Risk
Factors' beginning on page 3.

                               -------------------

     Neither the Securities and Exchange Commission nor any State Securities
Commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

This prospectus may not be used to consummate a sale of securities unless it is
accompanied by a prospectus supplement.

            The date of this prospectus is May 5, 2006


                              SUMMARY

         You should read the entire prospectus, including the section entitled
'Risk Factors,' carefully before making an investment decision.

                            THE COMPANY

     Research Frontiers Incorporated ("Research Frontiers" or the
"Company") develops and licenses its suspended particle technology for
controlling the amount of light passing through a device. Such
suspended particle devices are often referred to as "SPDs," "light
valves," or "SPD-Smart " products.

     SPDs use microscopic light-absorbing particles that are either in
a liquid suspension or a film. The microscopic particles align when an
electrical voltage is applied.  This permits light to pass through the
device, and allows the amount of light to be controlled. Our offices
are located at: 240 Crossways Park Drive, Woodbury, NY 11797
(telephone: 516-364-1902).

                           RISK FACTORS

         In addition to the other information in this prospectus, you should
carefully consider the following factors in evaluating us and our business
before purchasing the shares of common stock offered hereby. This prospectus
contains, in addition to historical information, forward-looking statements that
involve risks and uncertainties. Our actual results could differ materially.
Factors that could cause or contribute to such differences include, but are not
limited to, those discussed below, as well as those discussed elsewhere in this
prospectus, including the documents incorporated by reference.

There are risks associated with investing in companies such as ours who
are engaged in research and development.  Because of these risks, you
should only invest if you are able to bear the risk of losing your entire
investment.  Before investing, in addition to risks which could apply to
any issuer or offering, you should also consider the business we are in
and the following:

Research Frontiers has a history of operating losses, expects to incur
additional losses in the future, and consequently will need additional
funds in the future to continue its operations.  To date, Research
Frontiers has lost money, and we expect to lose money in the
foreseeable future.  Because we expect that our future revenues will
consist primarily of license fees (which have not been significant to date),
unless our licensees produce and sell products using our technology,
Research Frontiers will not be profitable. There is no guarantee
that we will ever be profitable. Since Research Frontiers was started
in 1965 through December 31, 2005, its total net loss was $58,932,898.
In 2005 our net loss was $3,747,532 and was $4,262,741 in 2004.

We have funded our operations by selling our common stock to investors.
If we need additional money, there is no guarantee that it will be available
when we need it, or on favorable terms. The Company will need to raise
additional capital no later than the first quarter of 2007 if operations,
including research and development and marketing, are to be maintained
at current levels. If the Company cannot raise additional funds,
it will be required to reduce expenses during 2006. Eventual success
of the Company and generation of positive cash flow will be dependent
upon the extent of  commercialization of products using the
Company's technology by the Company's licensees and payments
of continuing royalties on account thereof.

Research Frontiers depends upon the activities of its licensees in order
to be profitable.  We do not directly manufacture or market products
using SPD technology.  Although a variety of products have been sold by our
licensees, and since it is up to our licensees to decide when and if they
will introduce products using SPD technology, we cannot predict when
and if our licensees will generate substantial sales of such products.
Research Frontiers' SPD technology is currently licensed to 34 companies.
Other companies are also evaluating the technology for use in various
products. In the past, some companies have evaluated our technology
without proceeding further.  Also, we do not intend to manufacture
products using SPD technology.  Instead we intend to continue to
license our technology to manufacturers of end products, films and emulsion.
We expect that our licensees would be primarily responsible for marketing
and manufacturing, but we are also engaging in market
development activities.

Products using SPD technology have only recently been introduced into the
marketplace.  Developing products using new technologies can be risky
because problems, expenses and delays frequently occur.  Research
Frontiers cannot control whether or not its licensees will develop SPD
products.  Some of our licensees appear to be more active than others, some
appear to be better capitalized than others, and some licensees appear
to be inactive. There is no guarantee when or if our licensees will
successfully produce any commercial product using SPD technology.

SPD technology is the only technology Research Frontiers works with,
so that our success depends upon the viability of SPD technology which
has yet to be proven. We have not fully ascertained the performance and
long-term reliability of our technology, and therefore there is no
guarantee that our technology will successfully be incorporated into all
of the products which we are targeting for use of SPD technology. We
expect that different product applications for SPD technology will have
different performance and reliability specifications.  For example, SPD
eyewear requiring batteries may need to use lower voltages than SPD
windows used in homes or offices, yet may not need to last as long or be
exposed to as harsh an environment. We expect that our licensees will
primarily be responsible for reliability testing, but that we may also
continue to do reliability testing so that we can more effectively focus
our research and development efforts towards constantly improving the
performance characteristics and reliability of products using SPD technology.

                       AVAILABLE INFORMATION

Research Frontiers  files reports, proxy statements and other information
with the Securities and Exchange Commission. You may read and copy
such reports, proxy statements and other information at the public
reference room maintained by the SEC at 100 F Street, N.E.,
Washington, D.C. 20549 and you can obtain information on the operation
of the Public Reference Room by calling the SEC at 1-800-SEC-0330.
The SEC also maintains an internet web site at http://www.sec.gov
that contains reports, proxy and information statements and other
information regarding issuers,  such as Research Frontiers, that
file electronically with the SEC.  Additional information about us
can also be found at our web site at http://www.SmartGlass.com.

The SEC allows us to incorporate by reference the information we file
with them, which means that we can disclose important information to
you by referring you to those documents.  The information incorporated
by reference is considered to be part of this prospectus, and later
information that we file with the SEC will automatically update and
supersede this information.  We incorporate by reference into this
prospectus our:

o   annual report on Form 10-K for the fiscal year
    ended December 31, 2005,
o   the portions of the proxy statement dated April 30, 2006 for our
    annual meeting of stockholders to be held on June 8, 2006 that
    have been incorporated by reference into our report on Form 10-K
    for the fiscal year ended December 31, 2005, and
o   any future filings after effectiveness of the registration statement made
    with the SEC under Sections 13(a), 13(c), 14, or 15(d) of the Securities
    Exchange Act of 1934 until all of the common stock offered under this
    prospectus is sold.

All filings filed by Research Frontiers pursuant to the Exchange Act after the
date of the initial registration statement and prior to effectiveness
of the registration statement shall be deemed to be incorporated by reference
into this prospectus.

This prospectus is part of a registration statement we filed with the SEC.
As permitted by the SEC, this prospectus does not contain all of the
information set forth in the registration statement and the exhibits and
schedules thereto.  The statements contained in this prospectus as to the
contents of any contract or any other document are not necessarily
complete.  In each case you should refer to the copy of such contract or
document filed as an exhibit to the registration statement.

We will provide each person to whom this prospectus is delivered, a
copy of any information we have incorporated by reference but have not
delivered along with this prospectus. If you would like a copy of any
document incorporated herein by reference, other than exhibits unless
such exhibits are specifically incorporated by reference in any such
document, you can call or write to us at our  principal executive offices:
240 Crossways Park Drive, Woodbury, New York 11797-2033,
Attention: General Counsel (telephone: (516) 364-1902). We will
provide this information without charge to any person, including a
beneficial owner, to whom a copy of this prospectus is delivered upon
written or oral request.

No dealer, salesperson or other individual has been authorized to give
any information or to make any representation not contained in or
incorporated by reference in this prospectus or in any supplement to this
prospectus.  If given or made, you must not rely on such information or
representation as having been authorized by Research Frontiers. Neither
the delivery of this prospectus nor any sale made hereunder will,
under any circumstances, create an implication that there has not been
any change in the affairs of Research Frontiers since the date of this
prospectus or that the information contained herein is correct
or complete as of any time after the date of this prospectus.

This prospectus and any supplement to this prospectus do not constitute
an offer to sell or a solicitation of an offer to buy any securities offered
hereby to any person, or by anyone, in any jurisdiction in which such
offer or solicitation may not lawfully be made.

The information set forth herein and in all publicly disseminated
information about Research Frontiers, includes "forward-looking
statements" within the meaning of Section 21E of the Securities
Exchange Act of 1934, as amended, and is subject to the safe harbor
created by that section. Readers are cautioned not to place undue
reliance on these forward-looking statements as they speak only as of the
date of this prospectus and are not guaranteed.

                             DIVIDENDS

Research Frontiers has never paid any cash dividends and does not
expect to pay any cash dividends for the foreseeable future.

                          USE OF PROCEEDS

Unless we indicate otherwise in the applicable prospectus supplement,
we currently intend to use the net proceeds from this offering for general
corporate purposes, including our internal research and development
programs, general working capital and possible future acquisitions.

We have not determined the amounts we plan to spend on any of the areas listed
above or the timing of these expenditures. As a result, our management will have
broad discretion to allocate the net proceeds from this offering. Pending
application of the net proceeds as described above, we intend to invest the net
proceeds of the offering in money market funds and other interest-bearing
investments.

                    DESCRIPTION OF SECURITIES

   We may sell from time to time, in one or more offerings common stock and/or
warrants to purchase common stock.

DESCRIPTION OF COMMON STOCK

Research Frontiers can issue 100,000,000 shares of common stock,
$0.0001 par value per share. 13,812,559 shares were outstanding as of
the date of this prospectus.  Holders of common stock are entitled to one
vote per share on matters submitted to shareholders for their approval, to
dividends if declared by Research Frontiers, and to share in any
distribution of Research Frontiers' assets.  All outstanding shares of
common stock are fully paid for and non-assessable.  Holders of
common stock do not have cumulative voting rights or preemptive
rights.  Therefore, a minority stockholder may be less able to gain
representation on Research Frontiers' board of directors.

Listing

Our common stock is listed on the Nasdaq Capital Market under the symbol "REFR".

Transfer Agent and Registrar

Continental Stock Transfer and Trust Company is the transfer agent and registrar
for our common stock.

DESCRIPTION OF WARRANTS

The following description sets forth certain general terms and provisions of
the warrants to which any prospectus supplement may relate. The particular terms
of the warrants offered, the extent, if any, to which the general terms set
forth below apply to the warrants offered, and any modifications or additions to
the general terms as they relate to the warrants offered will be described in a
prospectus supplement.

General

We may issue warrants for the purchase of common stock from
time to time, and we may issue warrants independently or
together with common stock, and the warrants may be attached
to or separate from these securities.

We will describe in the applicable prospectus supplement the
terms of the series of warrants, including:

-the offering price and aggregate number of warrants offered;

-the number of shares of common stock purchasable upon the
exercise of one warrant and the price at which these shares may
be purchased upon such exercise;

-the dates on which the right to exercise the warrants will
commence and expire;

-the effect of any merger, consolidation, sale or other disposition
of our business on the warrant agreement and the warrants;

-the terms of any rights to redeem or call the warrants;

-any provisions for changes to or adjustments in the exercise
price or number of securities issuable upon exercise of the
warrants;

-to the extent material,federal income tax consequences of
holding or exercising the warrants;

-any other specific terms, preferences, rights or limitations of or
restrictions on the warrants.

Before exercising their warrants, holders of warrants will not
have any of the rights of holders of common stock, including
the right to receive dividends, if any, or, payments upon our
liquidation, dissolution or winding up or to exercise voting
rights, if any.

Exercise of Warrants

Each warrant will entitle the holder to purchase the securities
that we specify in the applicable prospectus supplement at the
exercise price that we describe in the applicable prospectus
supplement. Unless we otherwise specify in the applicable
prospectus supplement, holders of the warrants may exercise the
warrants at any time up to 6:00 P.M. Woodbury, New York time
on the expiration date that we set forth in the applicable
prospectus supplement. After the close of business on the
expiration date, unexercised warrants will become void.

Holders of the warrants may exercise the warrants by delivering
the warrant certificate representing the warrants to be exercised
together with specified information, and paying the required
amount to the Company in immediately available funds. Upon
receipt of the required payment and the warrant certificate
properly completed and duly executed, we will issue and deliver
the number of shares of common stock purchasable upon such
exercise. If fewer than all of the warrants represented by the
warrant certificate are exercised, then we will issue a new
warrant certificate for the remaining amount of warrants. Unless
we indicate otherwise in the applicable prospectus supplement,
holders of the warrants may surrender securities as all or part of
the exercise price for warrants.

                       PLAN OF DISTRIBUTION

We may sell the securities being offered hereby in one or more
of the following ways from time to time:

-through dealers or agents to the public or to investors;

-to underwriters for resale to the public or to investors;

- directly to investors; or

- through a combination of such methods.

We will set forth in a prospectus supplement the terms of the
offering of securities, including:

- the name or names of any agents, dealers or underwriters;

- the purchase price of the securities being offered and the
proceeds we will receive from the sale;

- any over-allotment options under which underwriters may
purchase additional securities from us;

-  any agency fees or underwriting discounts and other items
constituting agents' or underwriters' compensation;

- any initial public offering price;

- any discounts or concessions allowed or reallowed or paid to
dealers; and

 - any securities exchanges on which the securities may be listed
   if it is other than the Nasdaq Capital Market.

Underwriters, dealers and agents that participate in the
distribution of the securities may be deemed to be underwriters
as defined in the Securities Act and any discounts or
commissions they receive from us and any profit on their resale
of the securities may be treated as underwriting discounts and
commissions under the Securities Act. We will identify in the
applicable prospectus supplement any underwriters, dealers or
agents and will describe their compensation. We may have
agreements with the underwriters, dealers and agents to
indemnify them against specified civil liabilities, including
liabilities under the Securities Act. Underwriters, dealers and
agents may engage in transactions with or perform services for
us or our subsidiaries in the ordinary course of their businesses.
Certain persons that participate in the distribution of the
securities may engage in transactions that stabilize, maintain or
otherwise affect the price of the securities, including
over-allotment, stabilizing and short-covering transactions in
such securities, and the imposition of penalty bids, in
connection with an offering. Certain persons may also engage in
passive market making transactions as permitted by Rule 103 of
Regulation M. Passive market makers must comply with applicable
volume and price limitations and must be identified as passive
market makers. In general, a passive market maker must display
its bid at a price not in excess of the highest independent bid
for such security; if all independent bids are lowered below
the passive market maker's bid, however, the passive market
maker's bid must then be lowered when certain purchase
limits are exceeded.

                              EXPERTS

The financial statements of Research Frontiers as of December 31, 2005
and 2004, and for each of the years in the three-year period ended
December 31, 2005, have been incorporated by reference into this
prospectus and in the registration statement in reliance upon the reports of
BDO Seidman, LLP and KPMG LLP, independent certified public accountants,
which is also incorporated by reference into this prospectus, and upon
the authority of BDO Seidman, LLP and KPMG LLP as experts in
accounting and auditing.

                           LEGAL MATTERS

The legality of the securities offered hereby has been passed upon by
the law firm of Kronish, Lieb, Weiner & Hellman LLP.