<SEC-DOCUMENT>0001144204-13-026504.txt : 20130506
<SEC-HEADER>0001144204-13-026504.hdr.sgml : 20130506
<ACCEPTANCE-DATETIME>20130506161633
ACCESSION NUMBER:		0001144204-13-026504
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20130506
DATE AS OF CHANGE:		20130506

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CLEARSIGN COMBUSTION CORP
		CENTRAL INDEX KEY:			0001434524
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			WA

	FILING VALUES:
		FORM TYPE:		S-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-188381
		FILM NUMBER:		13816353

	BUSINESS ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168
		BUSINESS PHONE:		(206) 673-4848

	MAIL ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3
<SEQUENCE>1
<FILENAME>v343217_s3.htm
<DESCRIPTION>FORM S-3
<TEXT>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>As filed with the Securities and Exchange
Commission on May 6, 2013</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; padding-bottom: 2pt"><B>Registration No. ________</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>UNITED
STATES SECURITIES AND EXCHANGE COMMISSION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Washington, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Form S-3</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>REGISTRATION STATEMENT UNDER THE SECURITIES
ACT OF 1933</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>CLEARSIGN
COMBUSTION CORPORATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact Name of Registrant as Specified in
Its Charter)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 34%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Washington</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 32%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>3823</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 32%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>26-2056298</B></FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(State or other jurisdiction of</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0">incorporation or organization)</P></TD>
    <TD STYLE="vertical-align: bottom; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Primary Standard Industrial</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0">Classification Code
        Number)</P></TD>
    <TD STYLE="vertical-align: bottom; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(I.R.S. Employer</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0">Identification No.)</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>12870 Interurban Avenue South</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Seattle, Washington 98168</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(206) 673-4848</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0">(Address, including
zip code, and telephone number, including area code, of registrant&rsquo;s principal executive offices)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Richard F. Rutkowski</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Chief Executive Officer</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ClearSign Combustion Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>12870 Interurban Avenue South</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Seattle, Washington 98168</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(206) 673-4848</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0">(Name, address, including
zip code, and telephone number, including area code, of agent for service)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>With Copies to:</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Kevin Friedmann,&nbsp;Esq.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Richardson&nbsp;&amp; Patel, LLP</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>The Chrysler Building<BR>
405 Lexington Avenue, 49th Floor</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>New York, New York 10174</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Telephone: (212) 561-5559</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Fax: (917) 591-6898</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Approximate date of commencement of proposed sale to the
public:</B>&nbsp;From time to time after the effective date of this registration statement, as determined by market conditions
and other factors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If the only securities being registered on this Form are being
offered pursuant to dividend or interest reinvestment plans, please check the following box.&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If any of the securities being registered on this Form are to
be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered
only in connection with dividend or interest reinvestment plans, check the following box.&nbsp;<FONT STYLE="font-family: Wingdings">x</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this Form is filed to register additional securities for
an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration
statement number of the earlier effective registration statement for the same offering.&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this Form is a post-effective amendment filed pursuant to
Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering.&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this Form is a registration statement pursuant to General
Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to
Rule 462(e) under the Securities Act, check the following box.&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this Form is a post-effective amendment to a registration
statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities
pursuant to Rule 413(b) under the Securities Act, check the following box.&nbsp;<FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.&nbsp;&nbsp;See the definitions of &ldquo;large
accelerated filer,&rdquo; &ldquo;accelerated filer&rdquo; and &ldquo;smaller reporting company&rdquo; in Rule 12b-2 of the Exchange
Act.&nbsp;&nbsp;(Check one):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="font: 10pt Times New Roman, Times, Serif; width: 90%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 65%"><FONT STYLE="font-size: 10pt">Large accelerated filer <FONT STYLE="font-family: Wingdings">o</FONT></FONT></TD>
    <TD STYLE="vertical-align: top; width: 30%"><FONT STYLE="font-size: 10pt">Accelerated filer <FONT STYLE="font-family: Wingdings">o</FONT></FONT></TD></TR>
<TR>
    <TD NOWRAP STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">Non-accelerated filer <FONT STYLE="font-family: Wingdings">o</FONT>
    (Do     not check if a smaller reporting company)</FONT></TD>
    <TD NOWRAP STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">Smaller reporting company <FONT STYLE="font-family: Wingdings">x</FONT></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 1pt solid"><B>CALCULATION OF REGISTRATION FEE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B></B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Title of Each Class of<BR> Securities to be Registered</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Amount to be<BR> Registered (1)</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Proposed<BR> Maximum<BR> Offering Price<BR> Per Unit (2)</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Proposed<BR> Maximum<BR> Aggregate<BR> Offering Price (3)</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Amount of<BR> Registration Fee (4)</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="font-weight: bold; text-align: left; text-indent: -12pt; padding-left: 12pt">Primary Offering</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-left: 0.2in">Common Stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&mdash;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&mdash;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="text-align: left; padding-left: 0.2in">Preferred Stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&mdash;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&mdash;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-left: 0.2in">Warrants to purchase Preferred or Common Stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&mdash;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&mdash;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="width: 48%; font-weight: bold; text-align: left; text-indent: -12pt; padding-left: 12pt">Total for Primary Offering</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">&nbsp;</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">&nbsp;</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font-weight: bold">&nbsp;</TD>
    <TD STYLE="width: 1%; font-weight: bold; text-align: left">$</TD><TD STYLE="width: 10%; font-weight: bold; text-align: right">30,000,000.00</TD><TD STYLE="width: 1%; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font-weight: bold">&nbsp;</TD>
    <TD STYLE="width: 1%; font-weight: bold; text-align: left">$</TD><TD STYLE="width: 10%; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>4,092.00</B></FONT></TD><TD STYLE="width: 1%; font-weight: bold; text-align: left"><FONT STYLE="font-weight: normal; font-style: normal">(5)</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-indent: -12pt; padding-left: 12pt">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="font-weight: bold; text-align: left; text-indent: -12pt; padding-left: 12pt">Secondary Offering</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-left: 0.2in">Common Stock</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">11,250</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">8.81</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">99,112.50</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="text-align: left; padding-left: 0.2in">Common Stock underlying Warrants</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">136,368</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">8.81</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,201,402.08</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font-weight: bold; text-align: left">Total for Secondary Offering</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">147,618</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">$</TD><TD STYLE="font-weight: bold; text-align: right">8.81</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">$</TD><TD STYLE="font-weight: bold; text-align: right">1,300,514.58</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">$</TD><TD STYLE="font-weight: bold; text-align: right">177.39</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="text-indent: -12pt; padding-left: 12pt; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="text-align: right; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="text-align: right; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="text-align: right; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-align: left; border-bottom: Black 1pt solid">&nbsp;</TD><TD STYLE="text-align: right; border-bottom: Black 1pt solid">&nbsp;</TD><TD STYLE="text-align: left; border-bottom: Black 1pt solid">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font-weight: bold; text-align: left; text-indent: -12pt; padding-left: 12pt; padding-bottom: 2.5pt">Total for Primary and Secondary Offering</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left; padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left; padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left; padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="text-align: left; border-bottom: Black 2.5pt double"><B>$</B></TD><TD STYLE="font-weight: bold; text-align: right; border-bottom: Black 2.5pt double">4,269.39</TD><TD STYLE="font-weight: bold; text-align: left; border-bottom: Black 2.5pt double">&nbsp;</TD></TR>
</TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(1) <FONT STYLE="color: black; background-color: white">With
respect to the primary offering, the securities are being registered as an indeterminate number of securities which shall have
an aggregate offering price not to exceed $30,000,000.</FONT> In addition, up to 147,618 shares of common stock may be sold from
time to time pursuant to this Registration Statement by the selling shareholders included herein. This Registration Statement shall
also cover any additional securities to be offered or issued from share splits, share dividends, recapitalizations or similar transactions.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(2) With respect to the primary offering, the proposed maximum
offering price per unit will be determined from time to time by the registrant in connection with the issuance of securities. The
proposed maximum offering price per unit for the offering made by the selling shareholders has been estimated pursuant to Rule
457(c) solely for the purpose of calculating the registration fee.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(3) With respect to the primary offering, the proposed maximum
aggregate offering price has been estimated for the sole purpose of computing the registration fee pursuant to Rule 457(o) under
the Securities Act. With respect to the selling shareholders, the proposed maximum aggregate offering price has been estimated
for the purpose of computing the registration fee pursuant to Rule 457(c) under the Securities Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(4) With respect to the primary offering, the fee is calculated
in accordance with Rule 457(o) under the Securities Act. With respect to the offering by the selling shareholders, the fee is calculated
in accordance with Rule 457(c) under the Securities Act and is based on the average high and low prices reported for the shares
of common stock as reported by the NASDAQ Capital Market as of May 3, 2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(5) Pursuant to Rule 457(p) under the Securities Act of 1933,
as amended, the registrant is off-setting the amount of the filing fee due hereunder from the filing fee of $3,365.02 (the &ldquo;Original
Fee&rdquo;) originally paid on November 14, 2011 in conjunction with the filing of an S-1 registration statement, file no. 333-177946.
The filing fee was subsequently reduced to $1,987.53. On November 13, 2012 the registrant used $733.37 of the Original Fee to file
a registration statement on Form S-8, number 333-184884.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>The registrant hereby amends this Registration Statement
on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment that
specifically states that this Registration Statement shall thereafter become effective in accordance with Section&nbsp;8(a)&nbsp;of
the Securities Act or until this Registration Statement shall become effective on such date as the Commission, acting pursuant
to said Section&nbsp;8(a), may determine.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; color: red"><B>The information in this prospectus is not complete
and may be changed. Neither we nor the selling shareholders may sell these securities until the Securities and Exchange Commission
declares our registration statement 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.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; color: red"><B>Subject to completion, dated
May 6, 2013</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PROSPECTUS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="tlogo.jpg" ALT="Z:\Vineyard\Live jobs\2013\04 Apr\30 Apr\Shift I\v343217 ClearSign Combustion\Draft\03-Production"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>$30,000,000</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Common Stock, Preferred Stock and Warrants
Offered </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>by ClearSign Combustion Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>and</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>147,618 Shares of Common Stock Offered
by Selling Shareholders</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">By this prospectus
and an accompanying prospectus supplement, we may from time to time offer and sell, in one or more offerings, up to $30,000,000
in any combination of common stock, preferred stock and warrants. Also, the selling shareholders identified in this prospectus
may, from time to time, offer and sell up to 147,618 shares of common stock. See the section of this prospectus titled &ldquo;Selling
Shareholders.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We will provide
you with more specific terms of these securities in one or more supplements to this prospectus. You should read this prospectus
and the applicable prospectus supplement carefully before you invest.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We or any selling
stockholder may offer these securities from time to time in amounts, at prices and on other terms to be determined at the time
of offering. We or any selling stockholder may offer and sell these securities to or through underwriters, dealers or agents, or
directly to investors, on a continuous or delayed basis. The supplements to this prospectus will provide the specific terms of
the plan of distribution. The price to the public of such securities and the net proceeds we expect to receive from such sale will
also be set forth in a prospectus supplement. We will not receive any proceeds from the sale of our common stock by the selling
shareholders.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our common stock
is listed on the NASDAQ Capital Market under the symbol &ldquo;CLIR&rdquo;. On May 3, 2013, the closing price of our common stock
as reported by the NASDAQ Capital Market was $8.81 per share. The aggregate market value of our outstanding voting common stock
held by non-affiliates, based upon a closing sale price of our common stock on May 3, 2013 was $60,417,000. During the 12 calendar
month period that ends on, and includes, the date of this prospectus, we have not offered any securities pursuant to General Instruction
I.B.6. of Form S-3.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><B><I>We are an
&ldquo;emerging growth company&rdquo; under the federal securities laws and will be subject to reduced public company reporting
requirements. An investment in our securities may be considered speculative and involves a high degree of risk, including the risk
of a substantial loss of your investment. See &ldquo;Risk Factors&rdquo; on page 6 for more information on the risks you should
consider before buying our securities.&nbsp;&nbsp;An investment in our securities is not suitable for all investors. We intend
to continue to issue our securities in this offering and, as a result, your ownership in us is subject to dilution.&nbsp;</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved of these securities, or passed upon the adequacy or accuracy of
this prospectus.&nbsp; Any representation to the contrary is a criminal offense.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">The date of this prospectus is [_______],
2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TABLE OF CONTENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 90%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 10%; border-bottom: windowtext 1pt solid; text-align: center"><FONT STYLE="font-size: 10pt"><B>Page</B></FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">ABOUT THIS PROSPECTUS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">1</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">2</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">OUR BUSINESS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">3</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">RISK FACTORS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">6</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">USE OF PROCEEDS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">6</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">DILUTION</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">6</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">DESCRIPTION OF SECURITIES THAT MAY BE OFFERED</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">6</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">SELLING SHAREHOLDERS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">11</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">PLAN OF DISTRIBUTION</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">13</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">LEGAL MATTERS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">15</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">EXPERTS</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">15</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">WHERE YOU CAN FIND MORE INFORMATION</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">15</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,255,204)">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">INFORMATION INCORPORATED BY REFERENCE</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">16</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION FOR SECURITIES ACT LIABILITIES</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: center"><FONT STYLE="font-size: 10pt">16</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ABOUT THIS PROSPECTUS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus is part of a registration
statement filed with the Securities and Exchange Commission (the &ldquo;SEC&rdquo;) using a &ldquo;shelf&rdquo; registration process.
Under this shelf process, we may sell the securities described in this prospectus in one or more offerings. This prospectus provides
you with a general description of the securities which may be offered. Each time we offer securities for sale, we will provide
a prospectus supplement that contains specific information about the terms of that offering. Any prospectus supplement may also
add or update information contained in this prospectus. You should read both this prospectus and any prospectus supplement together
with additional information described below under &ldquo;Where You Can Find More Information&rdquo; and &ldquo;Information Incorporated
by Reference.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The registration statement that contains
this prospectus (including the exhibits thereto) contains additional important information about us and the securities we may offer
under this prospectus. Specifically, we have filed certain legal documents that establish the terms of the securities offered by
this prospectus as exhibits to the registration statement. We will file certain other legal documents that establish the terms
of the securities offered by this prospectus as exhibits to reports we file with the SEC. You may obtain copies of that registration
statement and the other reports and documents referenced herein as described below under the heading &ldquo;Where You Can Find
More Information.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">You should rely only on the information
contained or incorporated by reference in this prospectus and in any prospectus supplement. We have not authorized any other person
to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely
on it. We are not making offers to sell or solicitations to buy the securities in any jurisdiction in which an offer or solicitation
is not authorized or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is
unlawful to make an offer or solicitation. You should not assume that the information in this prospectus or any prospectus supplement,
as well as the information we file or previously filed with the SEC that we incorporate by reference in this prospectus or any
prospectus supplement, is accurate as of any date other than its respective date. Our business, financial condition, results of
operations and prospects may have changed since those dates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In this prospectus, unless the context otherwise
requires, references to &ldquo;ClearSign,&rdquo; &ldquo;we,&rdquo; &ldquo;us,&rdquo; &ldquo;our&rdquo; or the &ldquo;Company&rdquo;
refer to ClearSign Combustion Corporation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>DISCLOSURE REGARDING FORWARD-LOOKING
STATEMENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus and any accompanying prospectus
supplement, including the documents that we incorporate by reference, may contain forward-looking statements within the meaning
of Section 27A of the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), and Section 21E of the Securities
Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Forward-looking statements in this prospectus
and any accompanying prospectus supplement include, without limitation, statements related to our plans, strategies, objectives,
expectations, intentions and adequacy of resources. Investors are cautioned that such forward-looking statements involve risks
and uncertainties. Factors that could cause actual results to differ from those discussed in the forward-looking statements include,
but are not limited to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">&nbsp;</TD>
    <TD STYLE="width: 7%"><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="width: 86%"><FONT STYLE="font-size: 10pt">our limited cash and our history of losses;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">&nbsp;</TD>
    <TD STYLE="width: 7%"><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="width: 86%"><FONT STYLE="font-size: 10pt">our ability to achieve profitability;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">our limited operating history;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">emerging competition and rapidly advancing technology in our industry that may outpace our technology;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">customer demand for the products and services we develop;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">the impact of competitive or alternative products, technologies and pricing;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">our ability to manufacture any products we develop;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">general economic conditions and events and the impact they may have on us and our potential customers;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">our ability to obtain adequate financing in the future;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">our ability to continue as a going concern;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">our success at managing the risks involved in the foregoing items; and</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">other factors discussed in this prospectus.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In some cases, you can identify forward-looking
statements by terminology such as &lsquo;&lsquo;may,&rsquo;&rsquo; &lsquo;&lsquo;will,&rsquo;&rsquo; &lsquo;&lsquo;should,&rsquo;&rsquo;
&lsquo;&lsquo;could,&rsquo;&rsquo; &lsquo;&lsquo;expects,&rsquo;&rsquo; &lsquo;&lsquo;plans,&rsquo;&rsquo; &lsquo;&lsquo;intends,&rsquo;&rsquo;
&lsquo;&lsquo;anticipates,&rsquo;&rsquo; &lsquo;&lsquo;believes,&rsquo;&rsquo; &lsquo;&lsquo;estimates,&rsquo;&rsquo; &lsquo;&lsquo;predicts,&rsquo;&rsquo;
&lsquo;&lsquo;potential,&rsquo;&rsquo; or &lsquo;&lsquo;continue&rsquo;&rsquo; or the negative of such terms or other comparable
terminology. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee
future results, levels of activity, performance or achievements. Readers are cautioned not to place undue reliance on these forward-looking
statements, which speak only as of the date hereof. We do not undertake any obligation to publicly update or review any forward-looking
statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>OUR BUSINESS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>This is only a summary and may not contain
all the information that is important to you. You should carefully read both this prospectus and any accompanying prospectus supplement
and any other offering materials, together with the additional information described under the heading &ldquo;Where You Can Find
More Information.&rdquo;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>About ClearSign Combustion Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We are a development stage company that designs
and develops technologies that aim to improve key performance characteristics of combustion systems including energy efficiency,
emissions control, fuel flexibility and overall cost effectiveness.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We believe that our Electrodynamic Combustion
Control&trade; (ECC&trade;) technology could allow customers to benefit from substantially reduced costs associated with the construction
(including refurbishment and upgrade), operation and maintenance of these systems, as compared to combustion systems that use currently
available technology. We also believe that our technology could improve emissions control performance and meet regulatory standards
while at the same time yielding a significant increase in energy efficiency, thereby substantially reducing the cost of compliance
with air quality regulations. Our technology introduces a computer-controlled electric field into the combustion zone to allow
for more precise control of flame shape and heat transfer. This same technique can also be used to modify the complex chemical
reactions that occur during combustion in order to minimize harmful emissions while maximizing system efficiency. We believe our
technology can be adapted to various fuel types and multiple system sizes and configurations, and can be deployed on both a retrofit
and new-build basis.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Our Industry</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">Nearly two-thirds of the world&rsquo;s total
energy consumption is accounted for by combustion of hydrocarbon and other fuels in boilers, furnaces, kilns and turbines. These
are used to generate electrical power, to provide heat for all manner of industrial processes and for building heat and produce
more than 50 quadrillion British thermal units (BTUs) of energy annually in the U.S. In order to maximize energy efficiency while
keeping pace with regulatory guidelines for air pollution emissions, operators of these systems are continually installing, maintaining
and upgrading a variety of costly process control, air pollution control and monitoring systems. In its December 2012 analysis,
The McIlvaine Company projected that $44 billion will be invested globally in 2013 in equipment, instrumentation, and consumables
to reduce air pollution, representing a 26% increase over the 2012 total of $35 billion. &nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Our Technology</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>Overview.</I> While our technology has
not been deployed commercially, nor has it been tested or verified by any independent third party, if the results we have observed
in our laboratory testing can be replicated&nbsp;on a commercial scale, we believe our proprietary technology platform may increase
energy efficiency and improve fuel flexibility and environmental performance for most types of industrial and commercial combustion
systems.&nbsp;&nbsp;We believe our technology could compare favorably with current industry-standard air pollution control and
efficiency technologies including electrostatic precipitators, fabric filters, selective catalytic reduction devices, low- and
ultra-low NOx burners (which address nitrogen oxides), excess air systems and other such technologies. Such systems account for
the majority of combustion energy utilization globally. These include:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 11%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="width: 86%"><FONT STYLE="font-size: 10pt">electrical power generation,</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">hydrocarbon and chemical processing industries,</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">petroleum refining, </FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">gas utility turbines and turbines used in commercial and military aviation, and</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">all manner of industrial and commercial steam generation and industrial process heat.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>Technical requirements. </I>Our technology
consists, in its simplest form, of four major components: (a) a computer, (b) standard software delivering proprietary algorithms
to (c) a power amplifier (resident outside the combustion chamber) and (d) electrode(s) (inside the combustion chamber). The electrodes
are optimized in material and shape to best suit the specific geometry of a given installation. We have also demonstrated a technique
to apply ECC to a combustion system without requiring an electrode to have physical contact with the flame. Because the system&rsquo;s
basic components are available &lsquo;off the shelf&rsquo;, or require manufacturing techniques that are well within the current
state of the art, we do not depend on technology external to the Company that has not yet been developed.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>&nbsp;&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We believe our technology can be retrofitted
to existing combustion systems to improve their performance and has the potential to provide substantial savings in both capital
and operating costs, or, for new-builds, can serve as the basis for fundamental improvements in the design, cost and operation
of combustion systems. We believe the economic gain realized by an operator could be significant in both reduced capital expenditures
and savings in annual operating and maintenance costs (including reductions in those costs associated with fuel consumption and
emissions).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The gain in energy efficiency provided by
our technology in boilers, kilns, furnaces and turbines stems in part from our ability to precisely control the flow of hot gases
within a gas volume. In most cases, efficiency is increased by increasing heat flux onto targeted surfaces and reducing heat loss
from other surfaces. Additionally, because the formation of pollutants is greatly reduced at the source, the &lsquo;load&rsquo;
placed on downstream pollution control equipment is also reduced, lowering both capital and operating expense and yielding a positive
return on investment for system operators.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Research and Development Plan. </I>We
have tested aspects of our technology&nbsp;on our&nbsp;5,000 BTU and 25,000 BTU bench top scale prototypes and&nbsp;our 1 million
BTU research furnace. Our technology has not been tested or verified by any independent third party. Our research and development&nbsp;efforts
are now focused on the following sequence of activities:&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font-size: 10pt">&bull; </FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><I>Scale up to commercially relevant sizes. </I>We have finalized designs and built what we believe to be a commercially relevant furnace and burners. We have assembled a group of technical advisors comprised of subject matter experts in the areas of combustion, pollution control, physics, aeronautics and chemistry. We have identified key potential development partners and customers with whom we are engaged in discussions to apply our technology to their particular use at commercially relevant scale, which can be 1 million BTUs or greater. </FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font-size: 10pt">&bull; </FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><I>Site demonstration at full scale. </I>We plan to demonstrate our technology at one or more selected commercial sites. If achieved, these early site demonstrations will be aimed at retrofitting or replacing one or two burners in multi-burner systems with an eye toward evaluation of our technology at full scale in one or more operating systems. </FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font-size: 10pt">&bull; </FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><I>First installation. </I>Assuming the successful demonstration of small numbers of burners in multi-burner systems, we plan to retrofit an entire furnace with our technology applied to all burners. We believe that such a demonstration would provide the impetus for commercial adoption within the applicable industry. </FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font-size: 10pt">&bull; </FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><I>Enhancement of our intellectual property portfolio. </I>We have generated more than 150 inventions that we believe to be patentable subject matter which we have been and will continue to protect through patent application filings. As of March 31, 2013, we have filed 104 patent applications. </FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>The Combustion Markets</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>Overview</I>. We are seeking to enter
the combustion and emissions control market and to establish ourselves in a highly competitive industry against companies that
have both substantially greater financial resources than we do and established products.&nbsp;&nbsp;However, we believe that our
technology could offer a unique and powerful ability to improve energy efficiency and enhance operation while reducing many pollutants
at the source. We view our market as divided into two broad segments:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&bull; <I>Industrial combustion</I> includes
both solid fuel systems, such as cement kilns, wood and biomass furnaces, and industrial coal systems as well as gas-fired systems,
such as down-fired petrochemical reformers and natural gas-fired boilers.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&bull; <I>Power generation</I> includes electric
power plants fueled by pulverized coal and those utilizing gas-turbines.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">In each market segment and sub-segment, we
plan to initially market solutions that we believe could be cost-effective retrofitting of our technology onto existing, standard
system designs to simultaneously improve both their energy efficiency and pollution control characteristics.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Partnership Strategy</I>. We believe
that our Electrodynamic Combustion Control technology has the potential to transform industries that rely upon combustion, and
is broadly applicable in large, scalable, global markets.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We intend to form research and development
partnerships to develop our technology within the industrial combustion and power generation segments.&nbsp;&nbsp;Among the types
of potential partners we will seek to establish relationships with will be:&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">&middot;</TD><TD>Large OEMs interested in ECC technology;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">&middot;</TD><TD>Engineering and construction companies interested in differentiating their offerings while increasing profitability;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">&middot;</TD><TD>Industry research groups, whose mission is the development and testing of new technologies for the eventual benefit of their
member companies; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-indent: -0.25in"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">&middot;</TD><TD>Government entities such as the U.S. Department of Energy, who are chartered with the development of longer-range and potentially
disruptive energy technologies.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In April 2013, we announced our intention
to enter into a development agreement with Grandeg, a European manufacturer of commercial wood pellet boiler systems. Under the
agreement, we will develop solutions based on our ECC technology for both retrofit into existing Grandeg biomass boilers as well
as for integration into new product designs. Grandeg has indicated its intent to provide up to $500,000 in funding to support a
phased initial project that is expected to begin upon execution of a definitive agreement, with the goal of releasing a first commercial
solution to the market during 2014. While a definitive agreement is expected to be executed by June 2013, there is no assurance
that terms will be reached or a final agreement executed.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Corporate Information</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our facilities and executive offices are
located at 12870 Interurban Avenue South, Seattle, Washington 98168, and our telephone number is (206) 673-4848. We were incorporated
in Washington on January 23, 2008. Additional information about us is available on our website at www.clearsign.com. The information
contained on or that may be obtained from our website is not, and shall not be deemed to be, a part of this prospectus. Our common
stock, par value $0.001 per share, is currently traded on The NASDAQ Capital Market under the ticker symbol &ldquo;CLIR.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">For a description
of our business, financial condition, results of operations and other important information regarding us, we refer you to our
filings with the SEC incorporated by reference in this prospectus. For instructions on how to find copies of these documents,
see &ldquo;Where You Can Find More Information.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>RISK FACTORS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Investing in our common stock involves
a high degree of risk. Please see the risk factors set forth in Part I, Item 1A of our Annual Report on Form 10-K and other filings
we make with the SEC, which are incorporated by reference in this prospectus. Additional risk factors may be included in a prospectus
supplement relating to a particular offering of securities. Before making an investment decision, you should carefully consider
these risks as well as other information we include or incorporate by reference in this prospectus. The risks and uncertainties
we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently
deem immaterial may also affect our business operations. These risks could materially affect our business, results of operations
or financial condition and cause the value of our securities to decline.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>USE OF PROCEEDS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: black">Unless we state
otherwise in an accompanying prospectus supplement, we intend to use the net proceeds from the sale of the securities offered by
us under this prospectus and any related prospectus supplement for general corporate purposes. These purposes may include capital
expenditures and additions to working capital.</FONT> When a particular offering of securities is made, the prospectus supplement
relating to that offering will set forth our intended use of the net proceeds we receive from the sale of the securities. Pending
the application of the net proceeds, we may invest the proceeds in short-term, interest-bearing instruments or other investment-grade
securities. We will not receive any proceeds from the sales, if any, of the shares of common stock being offered and sold by the
selling shareholders or their pledgees, donees, transferees or other successors in interest<FONT STYLE="color: black">.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>DILUTION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We will set forth in a prospectus supplement
the following information regarding any material dilution of the equity interests of investors purchasing securities sold by ClearSign
in an offering under this prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the net tangible book value per share of our equity securities before and after the offering;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the amount of the increase in such net tangible book value per share attributable to the cash payments made by purchases in
the offering; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the amount of the immediate dilution from the public offering price which will be absorbed by such purchasers.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>DESCRIPTION OF THE SECURITIES THAT MAY
BE OFFERED</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Description of Common Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following summary of the rights of our
common stock is not complete and is subject to and qualified in its entirety by reference to our articles of incorporation and
bylaws, copies of which are incorporated by reference to our registration statement on Form S-1. See &ldquo;Where You Can Find
More Information.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have 64,500,000 shares of capital stock
authorized under our articles of incorporation, consisting of 62,500,000 shares of common stock and 2,000,000 shares of preferred
stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">As of May <FONT STYLE="color: black">6</FONT>,
2013 we had 8,793,265 shares of common stock issued and outstanding. Our authorized but unissued shares of common stock are available
for issuance without further action by our shareholders, unless such action is required by applicable law or the rules of the NASDAQ
Capital Market or any other stock exchange or automated quotation system on which our securities may become listed or traded. If
the approval of our shareholders is not so required, our board of directors may determine not to seek stockholder approval.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Holders of our common stock are entitled
to such dividends as may be declared by our board of directors out of funds legally available for such purpose, subject to any
preferential dividend rights of any then outstanding preferred stock. The shares of common stock are neither redeemable nor convertible.
Holders of common stock have no preemptive or subscription rights to purchase any of our securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Each holder of our common stock is entitled
to one vote for each such share outstanding in the holder&rsquo;s name. No holder of common stock is entitled to cumulate votes
in voting for directors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In the event of our liquidation, dissolution
or winding up, the holders of our common stock are entitled to receive pro rata our assets which are legally available for distribution,
after payments of all debts and other liabilities and subject to the prior rights of any holders of preferred stock then outstanding.
All of the outstanding shares of our common stock are fully paid and non-assessable. The shares of common stock offered by this
prospectus will also be fully paid and non-assessable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our common stock is listed on the NASDAQ
Capital Market under the symbol &ldquo;CLIR&rdquo;. On May <FONT STYLE="color: black">3,</FONT> 2013, the last sale price of our
common stock was $8.81 per share. The transfer agent and registrar for our common stock is VStock Transfer, LLC. Its address
is 77 Spruce Street, Suite 201, Cedarhurst, New York 11516, and its telephone number is (212) 828-8436.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Description of Preferred Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our articles of incorporation permit us
to issue up to 2,000,000 shares of preferred stock in one or more series and with rights and preferences that may be fixed or designated
by our board of directors without any further action by our shareholders. We currently have no shares of preferred stock outstanding.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Subject to the limitations prescribed in
our articles of incorporation and under Washington law, our articles of incorporation authorize the board of directors, from time
to time by resolution and without further stockholder action, to provide for the issuance of shares of preferred stock, in one
or more series, and to fix the designation, limitations, voting powers, preferences and relative rights of the shares and to fix
the qualifications, limitations and restrictions thereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Description of Warrants to Purchase Common
Stock or Preferred Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue warrants for the purchase of
our preferred stock or common stock, which we refer to in this prospectus as &ldquo;equity warrants&rdquo;. As explained below,
each equity warrant will entitle its holder to purchase our equity securities at an exercise price set forth in, or to be determined
as set forth in, the related prospectus supplement. Equity warrants may be issued separately or together with equity securities.
The equity warrants are to be issued under equity warrant agreements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The particular terms of each issue of equity
warrants and the equity warrant agreement relating to the equity warrants will be described in the applicable prospectus supplement,
including, as applicable:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the title of the equity warrants;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the initial offering price;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the aggregate number of equity warrants and the aggregate number of shares of the equity security purchasable upon exercise
of the equity warrants;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if applicable, the designation and terms of the equity securities with which the equity warrants are issued, and the number
of equity warrants issued with each equity security;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the date on which the right to exercise the equity warrants will commence and the date on which the right will expire;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if applicable, the minimum or maximum number of the equity warrants that may be exercised at any one time;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>anti-dilution provisions of the equity warrants, if any;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>redemption or call provisions, if any, applicable to the equity warrants;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any additional terms of the equity warrants, including terms, procedures and limitations relating to the exchange and exercise
of the equity warrants; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the exercise price.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Holders of equity warrants will not be entitled,
solely by virtue of being holders, to vote, to consent, to receive dividends, to receive notice as shareholders with respect to
any meeting of shareholders for the election of directors or any other matter, or to exercise any rights whatsoever as a holder
of the equity securities purchasable upon exercise of the equity warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Anti-Takeover Effects of Certain Provisions of Washington
Law and Our Charter Documents</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following is a summary of certain provisions
of Washington law, our articles of incorporation and our bylaws. This summary does not purport to be complete and is qualified
in its entirety by reference to the corporate law of Washington and our articles of incorporation and bylaws.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Effect of Washington Anti-Takeover Statute.</I>
We are subject to Section 23B.19 of the Washington Revised Statutes, an anti-takeover law (the &ldquo;Anti-Takeover Statute&rdquo;).
In general, the Anti-Takeover Statute prohibits a target corporation from entering into a significant business transaction with
an acquiring person for a period of five years following the acquiring person&rsquo;s share acquisition unless</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">&nbsp;</TD>
    <TD STYLE="width: 7%"><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="width: 86%"><FONT STYLE="font-size: 10pt">the share acquisition is exempt because it was inadvertently made and the acquiring person divests himself of a sufficient amount of the voting shares so that he is no longer the beneficial owner, directly or indirectly, of 10% or more of the outstanding voting shares of the target corporation and would not have, during the five year period prior to the announcement date of the significant business transaction been an acquiring person but for the inadvertent acquisition,</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">&nbsp;</TD>
    <TD STYLE="width: 7%"><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="width: 86%"><FONT STYLE="font-size: 10pt">the significant business transaction or the purchase of shares made by the acquiring person is approved prior to the acquiring person&rsquo;s share acquisition time by a majority of the members of the board of directors of the target corporation; or</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">&nbsp;</TD>
    <TD STYLE="width: 7%"><FONT STYLE="font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="width: 86%"><FONT STYLE="font-size: 10pt">at or subsequent to the acquiring person&rsquo;s share acquisition time, the significant business transaction is approved by a majority of the members of the board of directors of the target corporation and approved at an annual or special meeting of shareholders, and not by written consent, by the affirmative vote of at least two-thirds of the outstanding voting shares, except shares beneficially owned by or under the voting control of the acquiring person.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Anti-Takeover Statute generally defines
an &ldquo;acquiring person&rdquo; as a person or group of persons, other than the target corporation or a subsidiary of the target
corporation, who beneficially owns 10% or more of the outstanding voting shares of the target corporation. The term &ldquo;acquiring
person&rdquo; does not include a person who (a) beneficially owned 10% or more of the outstanding voting shares of the target corporation
on March 23, 1988; (b) acquires its shares by gift, inheritance, or in a transaction in which no consideration is exchanged; (c)
exceeds the 10% threshold as a result of action taken solely by the target corporation, such as redemption of shares, unless that
person, by his own action, acquires additional shares of the target corporation; (d) beneficially was the owner of 10% or more
of the outstanding voting shares prior to the time the target corporation had a class of voting shares registered with the SEC
pursuant to section 12 or 15 of the Securities Exchange Act; or (e) beneficially was the owner of 10% or more of the outstanding
voting shares prior to the time the target corporation amended its articles of incorporation to provide that the corporation shall
be subject to the provisions of this chapter.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Anti-Takeover Statute defines a &ldquo;significant
business transaction&rdquo; as:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(a)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">A merger, share exchange, or consolidation of a target corporation or a subsidiary of a target corporation with (i) an acquiring person, or (ii) any other domestic or foreign corporation which is, or after the merger, share exchange, or consolidation would be, an affiliate or associate of the acquiring person;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(b)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">A sale, lease, exchange, mortgage, pledge, transfer, or other disposition or encumbrance, whether in one transaction or a series of transactions, to or with an acquiring person or an affiliate or associate of an acquiring person of assets of a target corporation or a subsidiary of a target corporation (i) having an aggregate market value equal to 5% or more of the aggregate market value of all the assets, determined on a consolidated basis, of the target corporation, (ii) having an aggregate market value equal to 5% or more of the aggregate market value of all the outstanding shares of the target corporation, or (iii) representing 5% or more of the earning power or net income, determined on a consolidated basis, of the target corporation;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(c)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">The termination, while the corporation has an acquiring person and as a result of the acquiring person&rsquo;s acquisition of 10% or more of the shares of the corporation, of 5% or more of the employees of the target corporation or its subsidiaries employed in this state, whether at one time or over the five-year period following the share acquisition time;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(d)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">The issuance, transfer, or redemption by a target corporation or a subsidiary of a target corporation, whether in one transaction or a series of transactions, of shares or of options, warrants, or rights to acquire shares of a target corporation or a subsidiary of a target corporation to or beneficially owned by an acquiring person or an affiliate or associate of an acquiring person except pursuant to the exercise of warrants or rights to purchase shares offered, or a dividend, distribution, or redemption paid or made pro rata to, all shareholders or holders of options, warrants, or rights to acquire shares of the target corporation, and except for involuntary redemptions permitted by the target corporation&rsquo;s charter or by the law of this state or the state of incorporation;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(e)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">The liquidation or dissolution of a target corporation proposed by, or pursuant to an agreement, arrangement, or understanding, whether or not in writing, with an acquiring person or an affiliate or associate of an acquiring person;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(f)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">A reclassification of securities, including, without limitation, any shares split, shares dividend, or other distribution of shares in respect of stock, or any reverse shares split, or recapitalization of a target corporation, or a merger or consolidation of a target corporation with a subsidiary of the target corporation, or any other transaction, whether or not with or into or otherwise involving an acquiring person, proposed by, or pursuant to an agreement, arrangement, or understanding, whether or not in writing, with an acquiring person or an affiliate or associate of an acquiring person, that has the effect, directly or indirectly, of increasing the proportionate share of the outstanding shares of a class or series of voting shares or securities convertible into voting shares of a target corporation or a subsidiary of the target corporation that is directly or indirectly owned by an acquiring person or an affiliate or associate of an acquiring person, except as a result of immaterial changes due to fractional share adjustments; or</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(g)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">A receipt by an acquiring person or an affiliate or associate of an acquiring person of the benefit, directly or indirectly, except proportionately as a shareholder of a target corporation, of loans, advances, guarantees, pledges, or other financial assistance or tax credits or other tax advantages provided by or through a target corporation.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Finally, the Anti-Takeover Statute defines
a &ldquo;target corporation&rdquo; as:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(a)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Every domestic corporation, if:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(i) The corporation has a class
of voting shares registered with the SEC pursuant to Section 12 or 15 of the Securities Exchange Act; or&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(ii) The corporation&rsquo;s articles
of incorporation have been amended to provide that such a corporation shall be subject to the provisions of this chapter, if the
corporation did not have a class of voting shares registered with the SEC pursuant to section 12 or 15 of the Securities Exchange
Act on the effective date of that amendment; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48px">&nbsp;</TD>
    <TD STYLE="width: 48px"><FONT STYLE="font-size: 10pt">(b)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Every foreign corporation required to have a certificate of authority to transact business in the State of Washington if:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(i) The corporation has a class
of voting shares registered with the SEC pursuant to section 12 or 15 of the Securities Exchange Act;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(ii) The corporation&rsquo;s principal
executive office is located in the state;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(iii) The corporation has: (A)
more than 10% of its shareholders of record resident in the state; or (B) more than 10% of its shares owned of record by state
residents; or (C) 1,000 or more shareholders of record resident in the state;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(iv) A majority of the corporation&rsquo;s
employees, together with those of its subsidiaries, are residents of the state or the corporation, together with its subsidiaries,
employs more than one thousand residents of the state; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(v) A majority of the corporation&rsquo;s
tangible assets, together with those of its subsidiaries, measured by market value, are located in the state or the corporation,
together with its subsidiaries, has more than fifty million dollars&rsquo; worth of tangible assets located in the state.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Our Charter Documents.</I> Our charter
documents include provisions that may have the effect of discouraging, delaying or preventing a change in control or an unsolicited
acquisition proposal that a shareholder might consider favorable, including a proposal that might result in the payment of a premium
over the market price for the shares held by our shareholders. Certain of these provisions are summarized in the following paragraphs.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Effects of authorized but unissued common
stock and blank check preferred stock. </I>One of the effects of the existence of authorized but unissued common stock and undesignated
preferred stock may be to enable our board of directors to make more difficult or to discourage an attempt to obtain control of
our Company by means of a merger, tender offer, proxy contest or otherwise, and thereby to protect the continuity of management.
If, in the due exercise of its fiduciary obligations, the board of directors were to determine that a takeover proposal was not
in our best interest, such shares could be issued by the board of directors without shareholder approval in one or more transactions
that might prevent or render more difficult or costly the completion of the takeover transaction by diluting the voting or other
rights of the proposed acquirer or insurgent shareholder group, by putting a substantial voting block in institutional or other
hands that might undertake to support the position of the incumbent board of directors, by effecting an acquisition that might
complicate or preclude the takeover, or otherwise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, our articles of incorporation
grant our board of directors broad power to establish the rights and preferences of authorized and unissued shares of preferred
stock. The issuance of shares of preferred stock could decrease the amount of earnings and assets available for distribution to
holders of shares of common stock. The issuance also may adversely affect the rights and powers, including voting rights, of those
holders and may have the effect of delaying, deterring or preventing a change in control of our Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Cumulative Voting.</I> Our articles of
incorporation do not provide for cumulative voting in the election of directors which would allow holders of less than a majority
of the stock to elect some directors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Vacancies. </I>Our bylaws provide that
any vacancy occurring on our board of directors may be filled by the shareholders, by the board of directors or, if the directors
in office constitute less than a quorum, by the affirmative vote of a majority of the remaining directors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Special Meeting of Shareholders.</I>
A special meeting of shareholders may only be called by our chairman of the board, the president or the board of directors or by
holders of at least 25% of all the votes entitled to be cast on any issue proposed to be considered at the special meeting.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SELLING SHAREHOLDERS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have prepared this prospectus to allow
the selling shareholders named in the Selling Shareholder Table below to sell, from time to time, up to 147,618 shares of our common
stock. All of the common stock included in that table may be offered by the selling shareholders for their own account by means
of this prospectus. We will receive no proceeds from the sale of the shares held by the selling shareholders although, if the warrants
are exercised, we would receive $300,010 from the exercise of the warrants if a cashless exercise does not occur.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I><U>Registration of Warrants held by
the MDB Selling Shareholders</U></I> - As part of this prospectus, we are registering for resale 136,368 shares of common
stock underlying warrants. The shares described in the table below under the heading &ldquo;MDB Selling Shareholders&rdquo;
consist of shares of common stock that will be issued if these selling shareholders exercise their warrants. The warrants
were originally issued to MDB Capital Group LLC (&ldquo;MDB&rdquo;) in partial compensation for services rendered to us by
MDB in connection with a private offering we undertook in April 2011. MDB subsequently transferred warrants covering 62,050
shares of our common stock to its employees. The warrants include piggy-back registration rights, which the MDB Selling
Shareholders have exercised. Within the past three years, MDB has provided underwriting and investment banking services,
consulting services, and intellectual property services described in previously filed periodic reports, proxy statements and
other information with the SEC.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I><U>Registration of
Other Shares</U></I> - As part of this prospectus, we are registering for resale 11,250 shares of common stock issued to
John McFarland pursuant to the ClearSign Combustion Corporation 2013 Consultant Stock Plan approved by the Company&rsquo;s
shareholders on May 2, 2013 for consulting services provided or to be provided in 2013. Since September 2011, Mr. McFarland
has provided investor relations services to the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table sets forth information
with respect to the common stock known to us to be beneficially owned by the selling shareholders as of May <FONT STYLE="color: black">6</FONT>,
2013, including the total number of securities the selling shareholders may sell under this prospectus from time to time, and the
number of securities the selling shareholders will own thereafter assuming no other acquisitions or dispositions of our securities.
However, we have no way of determining the number of shares of common stock each will hold after this offering. Therefore, we have
prepared the table below on the assumption that the selling shareholders will sell all of the shares of common stock covered by
this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may amend or supplement this prospectus
from time to time to update the disclosure set forth herein, however, if a selling shareholder transfers his or her interest in
the common stock warrants prior to the effective date of the registration statement of which this prospectus is a part, we will
be required to file a post-effective amendment to the registration statement to provide the information concerning the transferee.
Alternatively, if a selling shareholder transfers his or her interest in the common stock warrants after the effective date of
the registration statement of which this prospectus is a part, we may use a supplement to update this prospectus. See our discussion
titled &ldquo;Plan of Distribution&rdquo; for further information regarding the selling shareholders&rsquo; method of distribution
of these shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Selling Shareholder Table</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Securities</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">&nbsp;</TD><TD NOWRAP>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Beneficially</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Securities</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">%&nbsp;Beneficial</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Owned&nbsp;Prior</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Beneficially</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Ownership</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">to</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Securities&nbsp;Being</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">Owned&nbsp;After</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center">After</TD><TD NOWRAP STYLE="color: black; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="color: black; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Name</TD><TD NOWRAP STYLE="color: black; font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offering&nbsp;(1)</TD><TD NOWRAP STYLE="padding-bottom: 1pt; color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offered</TD><TD NOWRAP STYLE="padding-bottom: 1pt; color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offering&nbsp;(2)</TD><TD NOWRAP STYLE="padding-bottom: 1pt; color: black; font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="color: black; font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="color: black; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offering</TD><TD NOWRAP STYLE="padding-bottom: 1pt; color: black; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; font-weight: bold; font-style: italic; text-align: left">MDB Selling Shareholders:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="width: 48%; color: black; text-align: left">MDB Capital Group LLC (3)(4)</TD><TD STYLE="width: 1%; color: black">&nbsp;</TD>
    <TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; color: black; text-align: right">534,025</TD><TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; color: black">&nbsp;</TD>
    <TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; color: black; text-align: right">74,318</TD><TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; color: black">&nbsp;</TD>
    <TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; color: black; text-align: right">459,707</TD><TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; color: black">&nbsp;</TD>
    <TD STYLE="width: 1%; color: black; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; color: black; text-align: right">5.1</TD><TD STYLE="width: 1%; color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; text-align: left">Amy En-Mei Wang (4)(5)(6)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">116,132</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">17,409</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">98,723</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">1.1</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="color: black; text-align: left">Christopher A. Marlett (4)(6)(7)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">810,967</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">91,727</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">719,240</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">8.0</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; text-align: left">Daniel E. Nagy (4)(6)(8)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">13,365</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">865</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">12,500</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">0.1</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="color: black; text-align: left">Gary A. Schuman (4)(6)(9)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">6,812</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">312</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">6,500</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">0.1</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; text-align: left">George H. Brandon (4)(10)(11)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">41,052</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">2,882</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">38,170</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">0.4</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="color: black; text-align: left">Kevin M. Cotter (4)(6)(12)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">30,867</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">2,882</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">27,985</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">0.3</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; text-align: left">Robert C. Clifford (4)(6)(13)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">66,507</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">2,882</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">63,625</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">0.7</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="color: black; text-align: left">Robert M. Levande (4)(6)(14)</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">134,708</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">17,409</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">117,299</TD><TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black">&nbsp;</TD>
    <TD STYLE="color: black; text-align: left">&nbsp;</TD><TD STYLE="color: black; text-align: right">1.3</TD><TD STYLE="color: black; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; font-weight: bold; text-align: left; padding-left: 9pt">Total of MDB Selling Shareholders</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">1,220,410</TD><TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">136,368</TD><TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">1,084,042</TD><TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">11.9</TD><TD STYLE="color: black; font-weight: bold; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; text-align: left">John McFarland (15)</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">24,750</TD><TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">11,250</TD><TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">13,500</TD><TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold">&nbsp;</TD>
    <TD STYLE="color: black; font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="color: black; font-weight: bold; text-align: right">0.2</TD><TD STYLE="color: black; font-weight: bold; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="color: black; font-weight: bold; text-align: left; padding-left: 9pt">Total of Selling Shareholders</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">1,245,160</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">147,618</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">1,097,542</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">11.9</TD><TD STYLE="font-weight: bold; text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(1)</TD><TD>Percentages stated in the above table are based on a total of 8,793,265 shares of common stock outstanding as of May 6, 2013.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(2)</TD><TD>Assumes that all of the shares offered hereby are sold and that shares owned before the offering but not offered hereby are
not sold.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(3)</TD><TD>Includes 289,207 shares of common stock and 244,818 shares of common stock underlying two warrants. Christopher A. Marlett
is CEO of MDB Capital Group LLC, a broker-dealer, and has sole voting and dispositive power with respect to its shares of common
stock.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(4)</TD><TD>The address of the security holder is 401 Wilshire Boulevard, Suite 1020, Santa Monica, California 90401.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(5)</TD><TD>Includes 74,573 shares of common stock and 41,559 shares of common stock underlying two warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(6)</TD><TD>This security holder is an associated person of a broker-dealer.&nbsp; This person has represented to the Company that he or
she received a portion of the securities as compensation, and he had no agreements or understanding, directly or indirectly, with
any person to distribute the securities at the time of their acquisition.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(7)</TD><TD>Includes 183,490 shares of common stock and 89,859 shares of common stock underlying two warrants owned by Mr. Marlett. This
amount also includes 3,593 shares of common stock owned by Integrated Surgical Systems, Inc. and 289,207 shares of common stock
and 244,818 shares of common stock underlying two warrants owned by MDB Capital Group LLC, for both of which Mr. Marlett is deemed
the beneficial owner.&nbsp; Mr. Marlett is&nbsp;the CEO and a director of Integrated Surgical Systems, Inc. The board of directors
of Integrated Surgical Systems, Inc., at large, holds voting and investment control over the securities held by the corporation.&nbsp;
Mr. Marlett is also CEO of MDB Capital Group LLC and has sole voting and dispositive power with respect to its shares of common
stock.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(8)</TD><TD>Includes 12,500 shares of common stock and 865 shares of common stock underlying a warrant.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(9)</TD><TD>Includes 4,500 shares of common stock and 312 shares of common stock underlying a warrant.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(10)</TD><TD>Includes 18,040 shares of common stock and 21.512 shares of common stock underlying two warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(11)</TD><TD>This security holder is an associated person of a broker-dealer.&nbsp; This person has represented to the Company that he acquired
a portion of the securities as an investment and received a portion of the securities as compensation, and he had no agreements
or understanding, directly or indirectly, with any person to distribute the securities at the time of their acquisition.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(12)</TD><TD>Includes 13,495 shares of common stock and 17,372 shares of common stock underlying two warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(13)</TD><TD>Includes 25,995 shares of common stock and 21,512 shares of common stock underlying two warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(14)</TD><TD>Includes 93,149 shares of common stock and 41,559 shares of common stock underlying two warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(15)</TD><TD>Includes 11,250 shares of common stock  held in escrow pending performance of consulting services  in 2013.                                                             The address
                                                            of the                                                                                                    security
                                                            holder                                                                 is 2854 Johnson Ferry Road, Suite 200, Marietta,
                                                            Georgia 30062.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PLAN OF DISTRIBUTION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We or the selling
shareholders may offer and sell the securities in any one or more of the following ways:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to or through underwriters, brokers or dealers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>directly to one or more other purchasers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>through a block trade in which the broker or dealer engaged to handle the block trade will attempt to sell the securities as
agent, but may position and resell a portion of the block as principal to facilitate the transaction;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>through agents on a best-efforts basis;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>in &ldquo;at the market&rdquo; offerings, as defined in Rule 415 under the Securities Act, at negotiated prices, at prices
prevailing at the time of sale or at prices related to such prevailing market prices, including sales made directly on NASDAQ or
sales made through a market maker other than on an exchange or other similar offerings through sales agents; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>otherwise through any other method permitted by applicable law or a combination of any of the above methods of sale.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">In addition, we
may enter into option, share lending or other types of transactions that require us to deliver shares of common stock to an underwriter,
broker or dealer, who will then resell or transfer the shares of common stock under this prospectus. We may also enter into hedging
transactions with respect to our securities. For example, we may:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>enter into transactions involving short sales of the shares of common stock by underwriters, brokers or dealers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>sell shares of common stock short and deliver the shares to close out short positions;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>enter into option or other types of transactions that require the delivery shares of common stock to an underwriter, broker
or dealer, who will then resell or transfer the shares of common stock under this prospectus; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>loan or pledge the shares of common stock to an underwriter, broker or dealer, who may sell the loaned shares or, in the event
of default, sell the pledged shares.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><FONT STYLE="font-size: 10pt">We
may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in
privately negotiated transactions. If the applicable prospectus supplement indicates, in connection with those derivatives, the
third parties may sell securities covered by this prospectus and the applicable prospectus supplement, including in short sale
transactions. If so, the third party may use securities pledged by or borrowed from us or others to settle those sales or to close
out any related open borrowings of stock, and may use securities received from us in settlement of those derivatives to close out
any related open borrowings of stock. The third party in such sale transactions will be an underwriter and, if not identified in
this prospectus, will be identified in the applicable prospectus supplement (or a post-effective amendment). In addition, we may
otherwise loan or pledge securities to a financial institution or other third party that in turn may sell the</FONT><FONT STYLE="font-size: 12pt">
</FONT><FONT STYLE="font-size: 10pt">securities short using this prospectus. Such financial institution or other third party may
transfer its economic short position to investors in our securities or in connection with a concurrent offering of other securities.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Each time we or
the selling shareholders sell securities, we or the selling shareholders will provide a prospectus supplement that will name any
underwriter, dealer or agent involved in the offer and sale of the securities. Any prospectus supplement will also set forth the
terms of the offering, including:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>the purchase price of the securities and the proceeds we or the selling shareholders will receive from the sale of the securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>


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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; color: black">&middot;</FONT></TD><TD>any underwriting discounts and other items constituting underwriters&rsquo; compensation;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any public offering or purchase price and any discounts or commissions allowed or re-allowed or paid to dealers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any commissions allowed or paid to agents;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other offering expenses;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any securities exchanges on which the securities may be listed;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the method of distribution of the securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the terms of any agreement, arrangement or understanding entered into with the underwriters, brokers or dealers; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; background-color: white"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other information we think is important.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">If underwriters
or dealers are used in the sale, the securities will be acquired by the underwriters or dealers for their own account. The securities
may be sold from time to time by us or the selling shareholders in one or more transactions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">at a fixed price or prices, which may be changed;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">at market prices prevailing at the time of sale;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">at prices related to such prevailing market prices;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">at varying prices determined at the time of sale;&nbsp;or</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">at negotiated prices.</FONT></TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">Such sales may
be effected:</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">in transactions on any national securities exchange or quotation service on which the securities may be listed or quoted at the time of sale;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">in transactions in the over-the-counter market;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">in block transactions in which the broker or dealer so engaged will attempt to sell the securities as agent but may position and resell a portion of the block as principal to facilitate the transaction, or in crosses, in which the same broker acts as an agent on both sides of the trade;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">through the writing of options;&nbsp;or</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-size: 10pt">&bull;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">through other types of transactions.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Any shares of common
stock covered by this prospectus that qualify for sale pursuant to Rule 144 under the Securities Act may be sold under Rule 144
rather than pursuant to this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><FONT STYLE="font-size: 10pt">The
securities may be offered to the public either through underwriting syndicates represented by one or more managing underwriters
or directly by one or more of such firms. Unless otherwise set forth in the prospectus supplement, the obligations of underwriters
or dealers to purchase the securities offered will be</FONT><FONT STYLE="font-size: 12pt"> </FONT><FONT STYLE="font-size: 10pt">subject
to certain conditions precedent and the underwriters or dealers will be obligated to purchase all the offered securities if any
are purchased. Any public offering price and any discount or concession allowed or reallowed or paid by underwriters or dealers
to other dealers may be changed from time to time.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The securities
may be sold directly by us, the selling shareholders or through agents as designated from time to time. Any agent involved in the
offer or sale of the securities in respect of which this prospectus is delivered will be named, and any commissions payable to
such agent will be set forth in, the prospectus supplement. Unless otherwise indicated in the prospectus supplement, any such agent
will be acting on a best efforts basis for the period of its appointment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>


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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Offers to purchase
the securities offered by this prospectus may be solicited, and sales of the securities may be made by us or the selling shareholders
directly to institutional investors or others, who may be deemed to be underwriters within the meaning of the Securities Act with
respect to any resale of the securities. The terms of any offer made in this manner will be included in the prospectus supplement
relating to the offer.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Some of the underwriters,
dealers or agents used by us or the selling shareholders in any offering of securities under this prospectus may be customers of,
engage in transactions with, and perform services for us or affiliates of ours in the ordinary course of business. Underwriters,
dealers, agents and other persons may be entitled to indemnification against and contribution toward certain civil liabilities,
including liabilities under the Securities Act, and to be reimbursed for certain expenses.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Subject to any
restrictions relating to debt securities in bearer form, any securities initially sold outside the United States may be resold
in the United States through underwriters, dealers or otherwise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Any underwriters
to which offered securities are sold by us or the selling shareholders for public offering and sale may make a market in such securities,
but those underwriters will not be obligated to do so and may discontinue any market making at any time.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The anticipated
date of delivery of the securities offered by this prospectus will be described in the applicable prospectus supplement relating
to the offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The selling shareholders
and any broker-dealer participating in the distribution of the shares of common stock may be deemed to be an &ldquo;underwriter&rdquo;
within the meaning of the Securities Act with respect to any securities such entity sells pursuant to this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">To comply with
the securities laws of some states, if applicable, the securities may be sold in these jurisdictions only through registered or
licensed brokers or dealers. In addition, in some states the securities may not be sold unless they have been registered or qualified
for sale or an exemption from registration or qualification requirements is available and is complied with.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">There can be no assurance that we or the
selling shareholders will sell all or any of the securities offered by this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>LEGAL MATTERS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Richardson &amp; Patel, LLP, with an office
at The Chrysler Building, 405 Lexington Avenue, 49th Floor, New York, New York 10174, will pass upon the validity of the securities
offered in this prospectus. As of May 6, 2013, Richardson &amp; Patel, LLP and its principals or entities controlled by its principals
own 166,495 shares of our common stock, a portion of which it accepted as payment for certain legal services rendered to us.
Although Richardson &amp; Patel, LLP is not under any obligation to accept shares of our common stock in payment for services,
it may do so in the future.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>EXPERTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Gumbiner Savett Inc., independent registered
public accounting firm, has audited our&nbsp;financial statements included in our Annual Report on Form 10-K for the year ended
December&nbsp;31, 2012, as set forth in their report, which is incorporated by reference in the prospectus and elsewhere in this
registration statement. Our financial statements are incorporated by reference in reliance on the report of Gumbiner Savett Inc.,
given on their authority as experts in accounting and auditing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>WHERE YOU CAN FIND MORE INFORMATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have filed with the SEC a registration
statement on Form S-3 under the Securities Act with respect to the securities
covered by this prospectus. This prospectus, which is a part of the registration statement, does not contain all of the information
set forth in the registration statement or the exhibits and schedules filed therewith. For further information with respect to
us and the securities covered by this prospectus, please see the registration statement and the exhibits filed with the registration
statement. A copy of the registration statement and the exhibits filed with the registration statement may be inspected without
charge at the Public Reference Room maintained by the SEC, located at 100&nbsp;F&nbsp;Street, N.E., Washington,&nbsp;D.C. 20549.
Please call the SEC at 1-800-SEC-0330 for more information about the operation of the Public Reference Room. The SEC also maintains
an Internet website that contains reports, proxy and information statements and other information regarding registrants that file
electronically with the SEC. The address of the website is http://www.sec.gov.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are subject to the information and periodic
reporting requirements of the Exchange Act and, in accordance therewith, we file periodic reports, proxy statements and other information
with the SEC. Such periodic reports, proxy statements and other information are available for inspection and copying at the Public
Reference Room and website of the SEC referred to above. We maintain a website at http://www.unipixel.com. You may access our Annual
Reports on Form&nbsp;10-K, Quarterly Reports on Form&nbsp;10-Q, Current Reports on Form&nbsp;8-K and amendments to those reports
filed pursuant to Sections&nbsp;13(a) or 15(d) of the Exchange Act with the SEC free of charge at our website as soon as reasonably
practicable after such material is electronically filed with, or furnished to, the SEC. Our website and the information contained
on that site, or connected to that site, are not incorporated into and are not a part of this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>INFORMATION INCORPORATED BY REFERENCE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The SEC and applicable law permits us to
&ldquo;incorporate by reference&rdquo; into this prospectus information that we have or may in the future file with or furnish
to the SEC. This means that we can disclose important information by referring you to those documents. You should read carefully
the information incorporated herein by reference because it is an important part of this prospectus. We hereby incorporate by reference
the following documents into this prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD STYLE="width: 92%"><FONT STYLE="font-size: 10pt">Our Annual Report on Form 10-K for the fiscal year ended December 31, 2012, as filed with the SEC on February 22, 2013; </FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">All information in our proxy statement filed with the SEC on March 27, 2013 to the extent incorporated by reference in our Annual Report on Form 10-K for the year ended December 31, 2012;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD>Our Quarterly Report on Form 10-Q for the period ended March 31, 2013, as filed with the SEC on May 6, 2013; and</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD STYLE="width: 92%"><FONT STYLE="font-size: 10pt">Our Current Reports on Form 8-K filed with the SEC on January 18, 2013 and January 22, 2013.</FONT></TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Additionally, all documents filed by us
with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, after the date of this prospectus and before the termination
or completion of this offering shall be deemed to be incorporated by reference into this prospectus from the respective dates of
filing of such documents. Any information that we subsequently file with the SEC that is incorporated by reference as described
above will automatically update and supersede any previous information that is part of this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Upon written or oral request, we will provide
you without charge, a copy of any or all of the documents incorporated by reference, other than exhibits to those documents unless
the exhibits are specifically incorporated by reference in the documents. Please send requests to ClearSign Combustion Corporation,
12870 Interurban Avenue South, Seattle, Washington 98168, Attn: Chief Financial Officer, Telephone: (206) 673-4848.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Disclosure
of Commission Position on Indemnification</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>for
Securities Act Liabilities</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Insofar as indemnification for liabilities
arising under the Securities Act of 1933 may be permitted to directors, officers or persons controlling the company, we have been
informed that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed
in the Act and is therefore unenforceable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PART II</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>INFORMATION NOT REQUIRED IN PROSPECTUS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 14.&#9;Other Expenses of Issuance and Distribution.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: black; background-color: white">The
following statement sets forth the expenses and costs expected to be incurred by ClearSign Combustion Corporation in connection
with the distribution of its securities being registered in this registration statement. All amounts other than the SEC registration
fee are estimates.</FONT>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 75%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="width: 87%; text-align: left">SEC registration fee </TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">4,269</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Transfer agent&rsquo;s fees and expenses </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="text-align: left">Legal fees and expenses </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">20,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Accounting fees and expenses </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="text-align: left; padding-bottom: 1pt">Miscellaneous fees and expenses </TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">12,000</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="padding-bottom: 2.5pt">Total </TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">39,269</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 15.&#9;Indemnification of Officers and Directors.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following summary is qualified in its
entirety by reference to the complete text of any statutes referred to below and the amended articles of incorporation of ClearSign
Combustion Corporation, a Washington corporation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Company&rsquo;s articles of incorporation
provide that, to the fullest extent permitted by Washington law, the Company&rsquo;s directors will not be liable to the Company
or its shareholders for monetary damages. This provision, however, does not eliminate or limit liability for acts or omissions
that involve intentional misconduct or a knowing violation of law by a director, for conduct violating Revised Code of Washington
section 23B.08.310 (approval of an unlawful distribution) or for any transaction from which the director will personally receive
a benefit in money, property, or services to which the director is not legally entitled. Pursuant to section 23B.08.52 of the Revised
Code of Washington, because the Company&rsquo;s articles of incorporation do not limit the obligation, the Company must indemnify
a director who was wholly successful, on the merits or otherwise, in the defense of any proceeding to which the director was a
party because of being a director against reasonable expenses incurred by the director in connection with the proceeding.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Company&rsquo;s bylaws further provide
that each person who was, is or is threatened to be made a party to or is otherwise involved in any threatened, pending or completed
action, suit, claim or proceeding, whether civil, criminal, administrative or investigative and whether formal or informal, by
reason of the fact that he or she is or was a director or officer of the Company or was serving at the Company&rsquo;s request
as a director, officer, partner, trustee, employee or agent of another entity, shall be indemnified and held harmless against all
losses, claims, damages, liabilities and expenses actually and reasonably incurred or suffered in connection with the proceeding.
This indemnification right continues even after the individual has ceased to be a director or officer or to serve at the Company&rsquo;s
request as a director, officer, partner, trustee, employee or agent of another entity. However, if the person indemnified initiates
the proceeding, he or she shall be entitled to indemnification only if the proceeding was authorized or ratified by the Company&rsquo;s
board of directors. No indemnification will be provided for acts or omissions finally adjudged to be intentional misconduct or
a knowing violation of law, for conduct finally adjudged to be in violation of Revised Code of Washington section 23B.08.310, for
any transaction with respect to which it was finally adjudged that the indemnitee personally received a benefit in money, property
or services to which the indemnitee was not legally entitled or if the Company is otherwise prohibited by applicable law from paying
indemnification. The Company must advance expenses to an indemnitee for an indemnification obligation so long as the Company receives
an undertaking by or on behalf of the indemnitee to repay all amounts so advanced if it is determined by a final judicial decision
from which there is no further right to appeal that the indemnitee is not entitled to be indemnified.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Under our Director and Officer Insurance
Policy, our directors and officers are provided liability coverage of $5 million subject to retention. The policy has a one year
term with annual renewal possible. The policy can be terminated by the insured if there is a merger or acquisition which includes
a change in ownership of 50% of the voting shares. Upon such an occurrence the insurer may elect to cancel the policy. We may elect
to then obtain &ldquo;run off&rdquo; insurance for a period of between one and six years at a cost of between 125% and 225% of
the initial policy premium. The policy is a claim made policy. It covers only those claims made during the policy term. If an act
giving rise to a claim occurs during the policy term, but the claim is not reported within 60 days of the termination or expiration
policy, the claim will not be covered.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="background-color: white">We
have entered into, and will enter into in the future, indemnification agreements with the individuals who serve as our officers
and directors. Pursuant to these agreements, we will indemnify officers and directors who are made parties to, or threatened to
be made parties to, any proceeding by reason of the fact that they are or were officers or directors, or are or were serving at
our request as a director, officer, employee, or agent of another entity. The agreements require us to indemnify our officers and
directors against all expenses, judgments, fines and penalties actually and reasonably incurred by them in connection with the
defense or settlement of any such proceeding, subject to the terms and conditions of the agreements.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Insofar as indemnification for liabilities
arising under the Securities Act may be permitted to directors, officers and controlling persons of the Company pursuant to the
foregoing provisions, or otherwise, the Company has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the Company of expenses incurred or paid by a director,
officer or controlling person of the Company in the successful defense of any action, suit or proceeding) is asserted by such director,
officer or controlling person in connection with the securities being registered, the Company will, unless in the opinion of its
counsel that the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such
issue.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 16.&#9;Exhibits.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">a) Exhibits.&nbsp;&nbsp;<FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 10%; border-bottom: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Exhibit</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>No.</B></P></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 89%; border-bottom: windowtext 1pt solid; text-align: center"><FONT STYLE="font-size: 10pt"><B>Description of Document</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-size: 10pt">4.1</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Form of Common Stock Certificate(1)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-size: 10pt">5.1</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Opinion of Richardson &amp; Patel, LLP*</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-size: 10pt">23.1</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Consent of Gumbiner Savett Inc., Independent Registered Public Accounting Firm*</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-size: 10pt">31.2</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Consent of Richardson &amp; Patel, LLP (included in Exhibit 5.1)*</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">*Filed herewith.</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Incorporated by reference from the registrant&rsquo;s registration statement on Form S-1, as amended, file number 333-177946,
originally filed with the Securities and Exchange Commission on November 14, 2011.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 17. &nbsp;Undertakings.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font-size: 10pt">(a)</FONT></TD>
    <TD STYLE="width: 94%"><FONT STYLE="font-size: 10pt">The undersigned Registrant hereby undertakes:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 11%">&nbsp;</TD>
    <TD STYLE="width: 4%"><FONT STYLE="font-size: 10pt">(1)</FONT></TD>
    <TD STYLE="width: 85%"><FONT STYLE="font-size: 10pt">To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 15%">&nbsp;</TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-size: 10pt">(i)</FONT></TD>
    <TD STYLE="width: 80%"><FONT STYLE="font-size: 10pt">To include any prospectus required by Section 10(a) (3) of the Securities Act of 1933, as amended;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 15%">&nbsp;</TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-size: 10pt">(ii)</FONT></TD>
    <TD STYLE="width: 80%"><FONT STYLE="font-size: 10pt">To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the &ldquo;Calculation of Registration Fee&rdquo; table in the effective registration statement.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 15%">&nbsp;</TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-size: 10pt">(iii)</FONT></TD>
    <TD STYLE="width: 80%"><FONT STYLE="font-size: 10pt">To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>provided, however</I>&nbsp;, that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) of this section
do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports
filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange
Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant
to Rule 424(b) that is part of the registration statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 11%">&nbsp;</TD>
    <TD STYLE="width: 4%"><FONT STYLE="font-size: 10pt">(2)</FONT></TD>
    <TD STYLE="width: 85%"><FONT STYLE="font-size: 10pt">That, for the purpose of determining any liability under the Securities Act of 1933, as amended, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 11%">&nbsp;</TD>
    <TD STYLE="width: 4%"><FONT STYLE="font-size: 10pt">(3)</FONT></TD>
    <TD STYLE="width: 85%"><FONT STYLE="font-size: 10pt">To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 11%">&nbsp;</TD>
    <TD STYLE="width: 4%"><FONT STYLE="font-size: 10pt">(4)</FONT></TD>
    <TD STYLE="width: 85%"><FONT STYLE="font-size: 10pt">That, for the purpose of determining liability under the Securities Act of 1933, as amended, to any purchaser:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 15%">&nbsp;</TD>
    <TD STYLE="width: 6%"><FONT STYLE="font-size: 10pt">(i)</FONT></TD>
    <TD STYLE="width: 79%"><FONT STYLE="font-size: 10pt">If the Registrant is relying on Rule 430B:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 21%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font-size: 10pt">(A)</FONT></TD>
    <TD STYLE="width: 76%"><FONT STYLE="font-size: 10pt">Each prospectus filed by the registrant pursuant to Rule 424(b)(3)shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 21%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font-size: 10pt">(B)</FONT></TD>
    <TD STYLE="width: 76%"><FONT STYLE="font-size: 10pt">Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act of 1933, as amended shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date; or</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

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    <TD STYLE="width: 15%">&nbsp;</TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-size: 10pt">(ii)</FONT></TD>
    <TD STYLE="width: 80%"><FONT STYLE="font-size: 10pt">If the registrant is subject to Rule 430C, each prospectus filed pursuant to Rule 424(b) as part of a registration statement relating to an offering, other than registration statements relying on Rule 430B or other than prospectuses filed in reliance on Rule 430A, shall be deemed to be part of and included in the registration statement as of the date it is first used after effectiveness. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such first use, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such date of first use.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 11%">&nbsp;</TD>
    <TD STYLE="width: 4%"><FONT STYLE="font-size: 10pt">(5)</FONT></TD>
    <TD STYLE="width: 85%"><FONT STYLE="font-size: 10pt">That, for the purpose of determining liability of the registrant under the Securities Act of 1933, as amended, to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 96px">&nbsp;</TD>
    <TD STYLE="width: 36px"><FONT STYLE="font-size: 10pt">&nbsp;(i)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 96px">&nbsp;</TD>
    <TD STYLE="width: 36px"><FONT STYLE="font-size: 10pt">&nbsp;(ii)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;</FONT></TD></TR>
</TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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    <TD STYLE="width: 96px">&nbsp;</TD>
    <TD STYLE="width: 36px"><FONT STYLE="font-size: 10pt">(iii)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and</FONT></TD></TR>
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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 96px">&nbsp;</TD>
    <TD STYLE="width: 36px"><FONT STYLE="font-size: 10pt">(iv)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.</FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

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    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font-size: 10pt">(b)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, as amended, each filing of the registrant&rsquo;s annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan&rsquo;s annual report pursuant to section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in this registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0.25in">&nbsp;</P>

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    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font-size: 10pt">(c)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Insofar as indemnification for liabilities arising under the Securities Act of 1933, as amended, may be permitted to directors, officers, and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission, such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable.&nbsp; In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer, or controlling person of the registrant in the successful defense of any action, suit, or proceeding) is asserted by such director, officer, or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question of whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.</FONT></TD></TR>
</TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In accordance with the requirements of the
Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements
for filing on Form S-3 and authorized this registration statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Seattle, State of Washington, on May 6, 2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2"><FONT STYLE="font-size: 10pt"><B>CLEARSIGN COMBUSTION CORPORATION</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 46%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">By:&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Richard F. Rutkowski</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt; color: black">Chief Executive Officer</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURES AND POWER OF ATTORNEY</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Know All Men By These Presents, that each
person whose signature appears below constitutes and appoints Richard F. Rutkowski and James N. Harmon, and each of them singly,
as his true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him and in his name,
place and stead, in any and all capacities, to sign any or all amendments (including any pre-effective or post-effective amendments)
to this registration statement or any related registration statement that is to be effective upon filing pursuant to Rule&nbsp;462(b),
and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in connection with the above premises, as fully to all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that said attorney-in-fact and agent or his substitute or substitutes, may lawfully
do or cause to be done by virtue thereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In accordance with the requirements of the
Securities Act of 1933, as amended, this Registration Statement was signed by the following persons in the capacities and on the
dates stated.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%"><FONT STYLE="font-size: 10pt">Dated: May 6, 2013</FONT></TD>
    <TD STYLE="width: 5%; text-align: right">&nbsp;</TD>
    <TD STYLE="width: 30%; border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Richard F. Rutkowski</FONT></TD>
    <TD STYLE="width: 15%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Richard F. Rutkowski</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Chief Executive Officer and Director</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(Principal Executive Officer)</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt">Dated: May 6, 2013</FONT></TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ James N. Harmon</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">James N. Harmon</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Chief Financial Officer</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(Principal Financial and <BR>
Accounting Officer)</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt">Dated: May 6, 2013</FONT></TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ David B. Goodson</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">David B. Goodson</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Chief Science Officer and Director</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt">Dated: May 6, 2013</FONT></TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Stephen E. Pirnat</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Stephen E. Pirnat, Director</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt">Dated: May 6, 2013</FONT></TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Scott P. Isaacson</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Scott P. Isaacson, Director</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt">Dated: May 6, 2013</FONT></TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Lon E. Bell</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Lon E. Bell, Ph.D., Director</FONT></TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>


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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>v343217_ex5-1.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>RICHARDSON
&amp; PATEL LLP</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">May 6, 2013</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">12870 Interurban Avenue South</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Seattle, Washington 98168</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Gentlemen:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have acted as counsel to ClearSign
Combustion Corporation, a Washington corporation (the &ldquo;<U>Company</U>&rdquo;), in connection with the proposed issuance
and sale from time to time by the Company, of (i) shares of its common stock, $0.0001 par value per share (the
&ldquo;<U>Common Stock</U>&rdquo;), (ii) shares of its preferred stock, $0.0001 par value (the &ldquo;<U>Preferred
Stock</U>&rdquo;), and (iii) warrants to purchase shares of Common Stock or Preferred Stock (the &ldquo;<U>Equity
Warrants</U>&rdquo;) with an aggregate offering price of up to $30,000,000, (the Common Stock, Preferred Stock and Equity
Warrants are each referred to herein as a &ldquo;<U>Security</U>,&rdquo; and collectively as the
&ldquo;<U>Securities</U>&rdquo;). The Securities may be issued and sold by the Company and certain selling stockholders (the
&ldquo;<U>Selling Stockholders</U>&rdquo;) may sell 147,618 shares of the Common Stock (the &ldquo;Selling Stockholder <U>Shares</U>&rdquo;)
for their respective accounts pursuant to a registration statement on Form S-3 (&ldquo;<U>Registration Statement</U>&rdquo;)
filed by the Company with the Securities and Exchange Commission (the &ldquo;<U>Commission</U>&rdquo;) on May 6, 2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">As your counsel in connection with this
opinion, we have examined such corporate records, documents, and instruments of the Company and reviewed such questions of law
as we have deemed necessary for the purpose of rendering the opinions set forth herein and we have examined the proceedings proposed
to be taken by the Company relating to the issuance and sale by the Company of the Securities. We have also examined the Registration
Statement as filed with the Commission in accordance with the provisions of the Securities Act of 1933, as amended (the &ldquo;<U>Act</U>&rdquo;),
and the rules and regulations of the Commission thereunder.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have examined such documents and considered
such legal matters as we have deemed necessary and relevant as the basis for the opinion set forth below. With respect to such
examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals,
the conformity to original documents of all documents submitted to us as reproduced or certified copies, and the authenticity of
the originals of those latter documents. As to questions of fact material to this opinion, we have, to the extent deemed appropriate,
relied upon certain representations of certain officers and employees of the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Based upon the foregoing, we are of the
opinion that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Securities.
When the Registration Statement becomes effective under the Act and when the offering is completed as contemplated by the Registration
Statement, the shares of Common Stock and Preferred will be validly issued, fully paid and non-assessable and, in the case of the
Equity Warrants, will be validly issued and binding obligations of the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">2. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Selling
Stockholder Shares. The Selling Stockholder Shares are validly issued, fully paid and non-assessable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We hereby consent to the use of this opinion
as an exhibit to the Registration Statement, to the use of our name as your counsel and to all references made to us in the Registration
Statement and in the prospectus forming a part thereof. In giving this consent, we do not hereby admit that we are in the category
of persons whose consent is required under Section 7 of the Act, or the rules and regulations promulgated thereunder. This opinion
is given as of the effective date of the Registration Statement, and we are under no duty to update the opinions contained herein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 40%">&nbsp;</TD>
    <TD STYLE="width: 60%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Very truly yours,</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">/s/ Richardson &amp; Patel LLP</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>v343217_ex23-1.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.1in"><IMG SRC="tlogo1.jpg" ALT=""></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CONSENT OF INDEPENDENT REGISTRERED PUBLIC
ACCOUNTING FIRM</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">We consent to the incorporation by reference in the
Registration Statement on Form S-3 of ClearSign Combustion Corporation of our report dated
February 22, 2013 with respect to the audited financial statements of ClearSign Combustion Corporation for the years ended
December 31, 2012 and 2011 and to the reference to our firm under the heading &ldquo;Experts&rdquo; in the prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">/s/ Gumbiner Savett Inc.</TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>May 6, 2013</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>Santa Monica, California</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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`
end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
