<SEC-DOCUMENT>0001144204-19-002096.txt : 20190118
<SEC-HEADER>0001144204-19-002096.hdr.sgml : 20190118
<ACCEPTANCE-DATETIME>20190118163049
ACCESSION NUMBER:		0001144204-19-002096
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20190118
DATE AS OF CHANGE:		20190118

SUBJECT COMPANY:	

	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
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-86820
		FILM NUMBER:		19533494

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIMMONS JAMES M
		CENTRAL INDEX KEY:			0001238466

	FILING VALUES:
		FORM TYPE:		SC 13D
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>tv511164_sc13d.htm
<DESCRIPTION>SCHEDULE 13D
<TEXT>
<HTML>
<HEAD>
<TITLE>Schedule 13D</TITLE>
</HEAD>

<BODY STYLE="font: 10pt Times New Roman, Times, Serif">


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


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

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

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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SCHEDULE 13D</B></P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Under the Securities Exchange Act of
1934</B></P>

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(Amendment No. )*&nbsp;</B></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: normal 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 100%; font: normal 14pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif">CLEARSIGN COMBUSTION CORPORATION</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Name of Issuer)</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif">Common Stock</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Title of Securities)</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: normal 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">185064102</TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(CUSIP Number)</FONT></TD></TR>
</TABLE>
<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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

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

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

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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Name, Address and Telephone Number of Person
Authorized to</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: normal 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 100%; font: normal 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif">January 8, 2019</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: normal 10pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Date of Event Which Requires Filing of This Statement)</FONT></TD></TR>
</TABLE>
<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">If the filing person has previously filed a statement on Schedule
13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), Rule
13d-1(f) or Rule 13d-1(g), check the following box.&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT></P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">*The remainder of this cover page shall be filled out
for a reporting person&rsquo;s initial filing on this form with respect to the subject class of securities, and for any subsequent
amendment containing information which would alter disclosures provided in a prior cover page.<BR>
<BR>
The information required on the remainder of this cover page shall not be deemed to be &ldquo;filed&rdquo; for the purpose of
Section 18 of the Securities Exchange Act of 1934 (&ldquo;Act&rdquo;) or otherwise subject to the liabilities of that section
of the Act but shall be subject to all other provisions of the Act (however, see the Notes).&nbsp;</P>

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

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

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


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    <!-- Field: /Page -->

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: left; text-indent: 0">CUSIP No. 185064102</TD></TR>
</TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0; width: 0.5in">1.</TD>
    <TD STYLE="border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Name of Reporting Person</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">James M. Simmons</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">IRS Identification Nos. of Above Persons (Entities
Only)&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">2.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="margin: 0pt 0">Check the Appropriate Box if a Member of a Group (See Instructions)</P>


        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(a)&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(b)&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">3.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="margin: 0pt 0">SEC Use Only</P>

        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">4.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="margin: 0pt 0">Source of Funds (See Instructions)</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">OO&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">5.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e)</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">6.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="margin: 0pt 0">Citizenship or Place of Organization</P>
        <P STYLE="margin: 0pt 0">&nbsp;</P>
        <P STYLE="margin: 0pt 0">United States</P></TD></TR>
</TABLE>


<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR>
    <TD ROWSPAN="4" STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; text-indent: 0; width: 1in">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Number of Shares Beneficially Owned
by Each Reporting Person With:</P></TD>
    <TD STYLE="vertical-align: top; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0; width: 0.5in">7.</TD>
    <TD STYLE="vertical-align: top; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="margin: 0pt 0">Sole Voting Power</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">1,666,627<SUP>(1)</SUP></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">8.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        Shared Voting Power
        <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">0</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">9.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        Sole Dispositive Power
        <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">1,666,627<SUP>(1)</SUP></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">10.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        Shared Dispositive Power
        <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">0</P></TD></TR>
</TABLE>


<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0; width: 0.5in">11.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Aggregate Amount Beneficially Owned by Each Reporting Person</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">1,666,627</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">12.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">&nbsp;<FONT STYLE="font-family: Times New Roman, Times, Serif"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">13.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        Percent of Class Represented by Amount in Row (11)
        <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">6.2%<SUP>(2)</SUP></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 2.5pt; font-size: 10pt; text-align: center; text-indent: 0">14.</TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 2.5pt; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Type of Reporting Person (See Instructions)</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">IN</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(1) Mr. Simmons was appointed to the issuer&rsquo;s Board of
Directors on January 8, 2019. Mr. Simmons is a principal of ICM Asset Management, Inc., an investment advisory firm (&ldquo;ICM&rdquo;).
The issuer&rsquo;s common stock is held by ICM for its clients. While Mr. Simmons has voting and investment control over the common
stock held by ICM, he disclaims beneficial ownership of such common stock.</P>

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(2) Based on 26,697,261 shares of common stock outstanding as
of January 8, 2019.</P>

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


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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; font-size: 10pt; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>Item 1.</B></FONT></TD>
    <TD STYLE="padding: 0; font-size: 10pt; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>Security and Issuer.</B></FONT></TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-weight: normal">This Schedule
13D relates to the common stock, par value $0.0001 per share, of ClearSign Combustion Corporation (the &ldquo;Company&rdquo;).
The Company is located at 12870 Interurban Avenue South, Seattle, Washington 98168.</FONT></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; padding: 0; font-size: 10pt; text-indent: 0"><B>Item 2.</B></TD>
    <TD STYLE="padding: 0; font-size: 10pt; text-indent: 0"><B>Identity and Background.</B></TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(a) The reporting person&rsquo;s name is James M. Simmons.</P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(b) The reporting person&rsquo;s address is c/o ClearSign Combustion
Corporation, 12870 Interurban Avenue South, Seattle, Washington 98168.</P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(c) The reporting person is a principal of ICM Asset Management,
Inc., an investment advisory firm (&ldquo;ICM&rdquo;). ICM is located at 601 W. Main Avenue, Suite 900, Spokane Washington 99201.</P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(d) The reporting person has not, during the last five years,
been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).</P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(e) The reporting person was not, during the last five years,
a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which the reporting
person was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities
subject to, federal or state securities laws or a finding of any violation with respect to such laws.</P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0">(f) The reporting person is a citizen of the United States.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; padding: 0; font-size: 10pt; text-indent: 0"><B>Item 3.</B></TD>
    <TD STYLE="padding: 0; font-size: 10pt; text-indent: 0"><B>Source and Amount of Funds or Other Consideration.</B></TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">As a principal of ICM, the reporting person
has voting and investment control over the assets held by ICM, which includes 1,666,627 shares of the Company&rsquo;s common stock.
The reporting person does not personally own any shares of the Company&rsquo;s common stock and disclaims beneficial ownership
of the common stock owned by ICM.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Item 4.</TD>
    <TD STYLE="padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Purpose of Transaction.</TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The reporting person was appointed as a
director of the Company on January 8, 2019 in conjunction with the execution of a Cooperation Agreement between the Company and
Anthony DiGiandomenico relating to Mr. DiGiandomenico&rsquo;s solicitation request to the Company&rsquo;s shareholders. The reporting
person does not, as of the date of this Schedule 13D, own securities of the Company but the Company may issue its securities, including
common stock or options to purchase the Company&rsquo;s common stock, to the reporting person as compensation for his services
as a director.</P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-weight: normal"></FONT></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Item 5.</TD>
    <TD STYLE="padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Interest in Securities of the Issuer.</TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">By virtue of being a principal of ICM, the
reporting person has voting and investment control over 1,666,627 shares of the Company&rsquo;s common stock, representing approximately
6.2% of the shares of common stock outstanding, based on information obtained from the Company as of January 8, 2019. The reporting
person is filing this Schedule 13D because he was appointed to the Company&rsquo;s board of directors on January 8, 2019. Other
than transactions made on behalf of ICM, which are reported on the Schedules 13F filed by ICM, the reporting person has not effected
any transaction in the Company&rsquo;s common stock during the last 60 days. T<FONT STYLE="background-color: white">he filing of
this Schedule 13D shall not be construed as an admission that the reporting person is, for the purposes of sections 13(d) of the
Securities Exchange Act of 1934, the beneficial owner of any securities covered by this Schedule 13D.</FONT></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Item 6.</TD>
    <TD STYLE="padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Contracts, Arrangements, Undertakings or Relationships with Respect to Securities of the Issuer.</TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Not applicable.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in; padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Item 7.</TD>
    <TD STYLE="padding: 0; font-weight: bold; font-size: 10pt; text-indent: 0">Material to be Filed as Exhibits.</TD></TR>
</TABLE>


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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Not applicable</P>

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

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

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-weight: normal">After
reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true,
complete and correct.</FONT></P>

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

<P STYLE="font: normal 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-weight: normal">Date: January 18, 2019</FONT></P>

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

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: normal 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 35%; padding: 0; font: normal 10pt Times New Roman, Times, Serif; text-indent: 0; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt; font-weight: normal">/s/
    James M. Simmons&nbsp;</FONT></TD>
    <TD STYLE="width: 65%; padding: 0; font: normal 10pt Times New Roman, Times, Serif; text-indent: 0"><FONT STYLE="font-size: 10pt; font-weight: normal">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: normal 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; font: normal 10pt Times New Roman, Times, Serif; text-indent: 0"><FONT STYLE="font-weight: normal">James M. Simmons</FONT></TD>
    <TD STYLE="padding: 0; font: normal 10pt Times New Roman, Times, Serif; text-indent: 0">&nbsp;</TD></TR>
</TABLE>


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

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

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