<SEC-DOCUMENT>0001571049-17-008599-index.html : 20171127
<SEC-HEADER>0001571049-17-008599.hdr.sgml : 20171127
<ACCEPTANCE-DATETIME>20171127092304
ACCESSION NUMBER:		0001571049-17-008599
CONFORMED SUBMISSION TYPE:	S-1/A
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20171127
DATE AS OF CHANGE:		20171127

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-1/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-221467
		FILM NUMBER:		171221963

	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-1/A
<SEQUENCE>1
<FILENAME>t1702958-s1a.htm
<DESCRIPTION>AMENDMENT NO. 1 TO FORM S-1
<TEXT>
Document 1 - file: t1702958-s1a.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>t1702894_duplex-reduce.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: t1702894_duplex-reduce.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>t1702894_duplex-increase.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: t1702894_duplex-increase.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>t1702894_map-ozone.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: t1702894_map-ozone.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>t1702894_map-ozoneproj.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: t1702894_map-ozoneproj.jpg

</DOCUMENT>
</SEC-DOCUMENT>