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

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION </B></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: 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>&nbsp;</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM 8-K </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>CURRENT REPORT </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Pursuant to Section 13 or 15(d) of the
</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Securities Exchange Act of 1934 </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>Date of report (Date of earliest event
reported): April 30, 2012</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">&nbsp;</P>

<P STYLE="font: 18pt 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>(Exact name of registrant as specified
in Charter) </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">&nbsp;</P>

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

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
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    <TD STYLE="width: 32%; vertical-align: top; font-weight: bold; text-align: center">Washington</TD>
    <TD STYLE="width: 3%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 31%; vertical-align: top; font-weight: bold; text-align: center">001-35521</TD>
    <TD STYLE="width: 3%; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="width: 31%; vertical-align: top; font-weight: bold; text-align: center">26-2056298</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(State or other jurisdiction of</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>incorporation or organization)</B></P></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(Commission File No.)</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-weight: bold; text-align: center">(IRS Employee Identification No.)</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>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>(Address of Principal Executive Offices)
</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>206-673-4848</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions (see General Instruction
A.2 below).</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD>Written communications pursuant to Rule 425 under the Securities
Act (17 CFR 230.425)</TD>
</TR></TABLE>


<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD>Soliciting material pursuant to Rule 14a-12 under the Exchange
Act (17 CFR240.14a-12)</TD>
</TR></TABLE>


<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD>Pre-commencement communications pursuant to Rule 14d-2(b)
under the Exchange Act (17 CFR 240.14d-2(b)).</TD>
</TR></TABLE>


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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD>Pre-commencement communications pursuant to Rule 13e-(c)
under the Exchange Act (17 CFR 240.13(e)-4(c))</TD>
</TR></TABLE>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 8.01&#9;Other Events</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 63pt; text-indent: -63pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On April 30, 2012, ClearSign Combustion
Corporation issued a press release announcing the closing of an underwritten public offering of 3,000,000 shares of its common
stock at a price of $4.00 per share, for gross proceeds of $12 million. We have <FONT STYLE="color: black">also granted the underwriter
a 45-day option to purchase up to an additional 450,000 shares of our common stock to cover over-allotments, if any. If the total
over-allotment is exercised, we expect gross proceeds to be $13.8 million.</FONT> The press release is included as Exhibit 99.1
to this Current Report on Form 8-K.</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 9.01&#9;Financial Statements and Exhibits</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">Exhibit 99.1&#9;Press release dated April
30, 2012</P>

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

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">SIGNATURE</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: 1in">Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this Current Report to be signed on its behalf by the undersigned hereunto
duly authorized.</P>

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

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<TR>
    <TD STYLE="vertical-align: top">&nbsp;Dated: April 30, 2012</TD>
    <TD COLSPAN="2">CLEARSIGN COMBUSTION CORPORATION</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; width: 50%">&nbsp;</TD>
    <TD STYLE="width: 4%">By:&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 46%">/s/ James N. Harmon</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; border-top: #000000 1px solid">James N. Harmon

<BR>
Chief Financial Officer

</TD></TR>
</TABLE>

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

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    <TD STYLE="width: 13%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; border-bottom: Black 1pt solid">Exhibit No.</TD>
    <TD STYLE="width: 2%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 85%; padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold; border-bottom: Black 1pt solid">Description</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">99.1</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">Press release dated April 30, 2012</TD></TR>
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{"company-data": {"conformed-name": "CLEARSIGN COMBUSTION CORP", "cik": "0001434524", "assigned-sic": "3823", "irs-number": "000000000", "state-of-incorporation": "WA"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-35521", "film-number": "12795872"}, "business-address": {"street1": "12870 INTERURBAN AVENUE SOUTH", "city": "SEATTLE", "state": "WA", "zip": "98168", "phone": "(206) 673-4848"}, "mail-address": {"street1": "12870 INTERURBAN AVENUE SOUTH", "city": "SEATTLE", "state": "WA", "zip": "98168"}}
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
Date of report (Date of earliest event
reported): April 30, 2012
CLEARSIGN COMBUSTION CORPORATION
(Exact name of registrant as specified
in Charter)
Washington
001-35521
26-2056298
(State or other jurisdiction of
incorporation or organization)
(Commission File No.)
(IRS Employee Identification No.)
12870 Interurban Avenue South
Seattle, Washington 98168
(Address of Principal Executive Offices)
206-673-4848
(Issuer Telephone number)
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions (see General Instruction
A.2 below).
¨
Written communications pursuant to Rule 425 under the Securities
Act (17 CFR 230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange
Act (17 CFR240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b)
under the Exchange Act (17 CFR 240.14d-2(b)).
¨
Pre-commencement communications pursuant to Rule 13e-(c)
under the Exchange Act (17 CFR 240.13(e)-4(c))
Item 8.01	Other Events
On April 30, 2012, ClearSign Combustion
Corporation issued a press release announcing the closing of an underwritten public offering of 3,000,000 shares of its common
stock at a price of $4.00 per share, for gross proceeds of $12 million. We have
also granted the underwriter
a 45-day option to purchase up to an additional 450,000 shares of our common stock to cover over-allotments, if any. If the total
over-allotment is exercised, we expect gross proceeds to be $13.8 million.
The press release is included as Exhibit 99.1
to this Current Report on Form 8-K.
Item 9.01	Financial Statements and Exhibits
Exhibit 99.1	Press release dated April
30, 2012
SIGNATURE
Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this Current Report to be signed on its behalf by the undersigned hereunto
duly authorized.
Dated: April 30, 2012
CLEARSIGN COMBUSTION CORPORATION
By:
/s/ James N. Harmon
James N. Harmon
Chief Financial Officer
EXHIBIT INDEX
Exhibit No.
Description
99.1
Press release dated April 30, 2012