July 10, 2019
United States Securities and Exchange Commission
Division of Corporation Finance
100 F Street, N.E.
Washington, D.C. 20549
Attention: Eric Atallah
| Re: | Request for Acceleration |
ClearSign Combustion Corporation - Registration Statement on Form S-3
(SEC File No. 333-232402)
Mr. Atallah:
Pursuant to Rule 461 of the Securities Act of 1933, as amended, ClearSign Combustion Corporation (the “Company”) respectfully requests that its Registration Statement on Form S-3 (SEC File No. 333-232402) be ordered effective at 5:00 p.m., Washington, D.C. time, on July 12, 2019, or as soon thereafter as practicable. The Company requests that it be notified of such effectiveness by a telephone call to Mary Ann Sapone at (310) 312-3258.
| Sincerely, | ||
| CLEARSIGN COMBUSTION CORPORATION | ||
| By: | /s/ Colin James Deller | |
| Colin James Deller, Chief Executive Officer | ||