Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  GPclirSPV LLC
 2. Date of Event Requiring Statement (Month/Day/Year)
07/20/2018		 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)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SPRING LAKE, NJ 07762		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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 5,213,543
I
See footnotes (1) (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 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 07/20/2018 02/01/2019 Contractual Right to Purchase Common Stock 478,854 $ 4 I See footnotes (1) (2)

Reporting Owners

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

Signatures

GPclirSPV LLC, By: /s/ Robert T. Hoffman Sr, Managing Member 08/06/2018
**Signature of Reporting Person Date
Princeton Opportunity Management LLC, By: /s/ Robert T. Hoffman Sr., Managing Member 08/06/2018
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(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 other than clirSPV disclaims any such beneficial ownership in the Common Stock or Contractual Rights to Purchase Common Stock except to the extent of their pecuniary interest therein.

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