For the Inventor, By the Inventor

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Seattle, WA, United States of America

Clearsign Technologies Corporation

USPTO Granted Patents = 26

% Expired Patents = 30.8

EPO Patents = 10

Forward Citations = 7

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20 inventors (with patents filed for the assignee):

Christopher A Wiklof (19 out of 211 patents)

Douglas Wayne Karkow (17 out of 48 patents)

Donald W Kendrick (13 out of 30 patents)

4. Joseph Colannino (10 out of 72 patents)

5. James Kyle Dansie (10 out of 15 patents)

6. Jesse Dumas (4 out of 9 patents)

7. Robert E Breidenthal (4 out of 34 patents)

8. Igor A Krichtafovitch (3 out of 70 patents)

9. Venkatesh Iyer (3 out of 3 patents)

10. Colin James Deller (3 out of 4 patents)

11. Jackson Matthew Pleis (3 out of 3 patents)

12. Sunny Karnani (2 out of 2 patents)

13. Robert Geiger (2 out of 3 patents)

14. Jonathan Bucher (1 out of 2 patents)

15. Jerry Michael Lang, Sr (1 out of 1 patent)

26 patents: Sort by Forward Citations

1. 12359804 - Burner system with discrete transverse flame stabilizers (2025-07-15),

2. 12247733 - Prefabricated integrated combustion assemblies and methods of installing the same into a combustion system (2025-03-11),

3. 12066248 - Burner system including a plurality of perforated flame holders (2024-08-20),

4. 12050151 - Burner including an electrical permittivity or electrical capacitance flame sensor (2024-07-30),

5. 12007301 - Variable composition gas mixture sensor (2024-06-11),

6. 11953201 - Control system and method for a burner with a distal flame holder (2024-04-09),

7. 11906160 - Combustion system including a mixing tube and a flame holder (2024-02-20),

8. 11473774 - Methods of upgrading a conventional combustion system to include a perforated flame holder (2022-10-18),

9. 11460188 - Ultra low emissions firetube boiler burner (2022-10-04),

10. 11435143 - Burner system with discrete transverse flame stabilizers (2022-09-06),

11. 11313553 - Plug and play burner (2022-04-26),

12. 11248786 - Method for a perforated flame holder with adjustable fuel nozzle (2022-02-15),

13. 11156356 - Fuel combustion system with a perforated reaction holder (2021-10-26),

14. 11073280 - Electrodynamic control in a burner system (2021-07-27),

15. 11060720 - Plasma pilot (2021-07-13),

ClearSign Technologies Corporation is a leading provider of flame and environmentally friendly combustion systems. Their patented Duplex™ and Electrodynamic Combustion Control™ technologies improve energy efficiency, lower emissions, and reduce operating costs for a wide range of industries, including oil refining, power generation, and chemical processing.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

26 Patents

#88 in Seattle, WA

#289 in Washington

#12,843 in US

#24,758 in the World

Seattle, WA, United States of America

Clearsign Technologies Corporation

Forward Citations = 7

20 inventors:

Christopher A Wiklof (19 out of 211 patents)

Douglas Wayne Karkow (17 out of 48 patents)

Donald W Kendrick (13 out of 30 patents)

4. Joseph Colannino (10 out of 72 patents)

5. James Kyle Dansie (10 out of 15 patents)

Please report any incorrect information to [email protected]

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