Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * clirSPV LLC	2. Date of Event Requiring Statement (MM/DD/YYYY) 7/20/2018	3. Issuer Name and Ticker or Trading Symbol CLEARSIGN COMBUSTION CORP [CLIR]
(Last)        (First)        (Middle) 119 WARREN AVENUE, 3RD FLOOR	4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                            ___ X ___ 10% Owner _____ Officer (give title below)          _____ Other (specify below)
(Street) SPRING LAKE, NJ 07762        (City)              (State)              (Zip)	5. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _ X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	5213543	D   (1) (2)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Contractual Right to Purchase Common Stock	7/20/2018	2/1/2019	Contractual Right to Purchase Common Stock	478854	$4	I	See Notes   (1) (2)

Explanation of Responses:
(1)	clirSPV LLC ("clirSPV") is the record holder of the securities reported herein. GPclirSPV LLC ("GPclirSPV") is the Manager of clirSPV. Princeton Opportunity Management LLC ("Princeton Opportunity Management") has an Investment Management Agreement for clirSPV.
(2)	Robert T. Hoffman is the Managing Member of GPclirSPV and Princeton Opportunity Management and shares the power to vote and dispose of the securities beneficially owned by clirSPV. As such, each of GPclirSPV, Princeton Opportunity Management and Robert T. Hoffman Sr. may be deemed to have or share beneficial ownership of the Common Stock or Contractual Rights to Purchase Common Stock held directly by clirSPV. Each such entity or individual other than clirSPV disclaims any such beneficial ownership except to the extent of their pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
clirSPV LLC 119 WARREN AVENUE 3RD FLOOR SPRING LAKE, NJ 07762		X

Signatures
/s/ Robert T. Hoffman Sr, Managing Member		7/30/2018
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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