    <SEC-DOCUMENT>0001144204-18-021036-index.html : 20180418
    <SEC-HEADER>0001144204-18-021036.hdr.sgml : 20180418
    <ACCEPTANCE-DATETIME>20180418060100
    ACCESSION NUMBER:		0001144204-18-021036
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		4
    CONFORMED PERIOD OF REPORT:	20180503
    FILED AS OF DATE:		20180418
    DATE AS OF CHANGE:		20180418
    EFFECTIVENESS DATE:		20180418

    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
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-35521
    		FILM NUMBER:		18760154

    	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>DEF 14A
    <SEQUENCE>1
    <FILENAME>tv491083-def14a.htm
    <DESCRIPTION>DEFINITIVE PROXY STATEMENT
    <TEXT>
    Document 1 - file: tv491083-def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>lg_clearsign.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: lg_clearsign.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tv491083_pc1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tv491083_pc1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tv491083_pc2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tv491083_pc2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>