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ClearSign Technologies Corporation (CLIR)

Nasdaq: CLIR · Industrial Instruments For Measurement, Display, and Control · Tulsa, OK · filing with the SEC since 2008
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◀ Past 2.0● Present 3.5▶ Future 6.1
1 est.
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Patents

US patents through Dec 31, 2025 · PatentsView, from the USPTO’s Open Data Portal · read Oct 27, 2026

112 patents granted to the 4 names below, as the owner printed on each patent when it was granted. A later sale, a lapse or an expiry is not read, so this is what was granted to ClearSign Technologies Corporation’s names, not what it holds today.

Patents granted
112
112 utility, 1976 to Dec 31, 2025
Granted in 2025
2
Against 6 in 2024 and none in 2023
Applications published
209
2 of them in 2025
Names they are printed under
4
a former name, its own name
By yearGrantedApplications published
'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
Each pair is one calendar year. Applications are published about eighteen months after filing, so the newest years read low.
What they are aboutgrants since 2021
Thermal processes and apparatus19
The main technology area of each patent, in the World Intellectual Property Organization’s 35 fields.
Under which name4 counted
CLEARSIGN COMBUSTION CORPORATION a former name
US, as the owner printed on each patent
84 granted
63 published
ClearSign Combustion Corporation a former name
named as the applicant on its applications, in US
0 granted
124 published
ClearSign Technologies Corporation its own name
US, as the owner printed on each patent
28 granted
1 published
ClearSign Technologies Corporation its own name
named as the applicant on its applications, in US
0 granted
21 published
Newest grantseach row opens the USPTO’s own copy
GrantedPatentTitleFieldOwner as printed
Jul 15, 202512,359,804Burner system with discrete transverse flame stabilizersThermal processes and apparatusClearSign Technologies Corporation
Mar 11, 202512,247,733Prefabricated integrated combustion assemblies and methods of installing the same into a combustion systemThermal processes and apparatusClearSign Technologies Corporation
Aug 20, 202412,066,248Burner system including a plurality of perforated flame holdersThermal processes and apparatusClearSign Technologies Corporation
Jul 30, 202412,050,151Burner including an electrical permittivity or electrical capacitance flame sensorThermal processes and apparatusClearSign Technologies Corporation
Jun 11, 202412,007,301Variable composition gas mixture sensorThermal processes and apparatusClearSign Technologies Corporation
Apr 9, 202411,953,201Control system and method for a burner with a distal flame holderThermal processes and apparatusClearSign Technologies Corporation
Apr 9, 202411,953,199Burner and burner system with flange mountThermal processes and apparatusClearSign Technologies Corporation
Feb 20, 202411,906,160Combustion system including a mixing tube and a flame holderThermal processes and apparatusClearSign Technologies Corporation
Oct 18, 202211,473,774Methods of upgrading a conventional combustion system to include a perforated flame holderThermal processes and apparatusClearSign Technologies Corporation
Oct 4, 202211,460,188Ultra low emissions firetube boiler burnerThermal processes and apparatusClearSign Technologies Corporation
Newest applications publishedan application is a clue, never a plan
PublishedApplicationTitleFieldOwner as printed
May 22, 20252025/0164104PREFABRICATED INTEGRATED COMBUSTION ASSEMBLIES AND METHODS OF INSTALLING THE SAME INTO A COMBUSTION SYSTEMThermal processes and apparatusClearSign Technologies Corporation
Mar 20, 20252025/0093024BURNER SYSTEM INCLUDING A DISTAL FLAME HOLDER AND A NON-REACTIVE FLUID SOURCEThermal processes and apparatusClearSign Technologies Corporation
Dec 5, 20242024/0401798HIGH PERFORMANCE LOW NOx BURNER AND SYSTEM AND METHOD OF OPERATIONThermal processes and apparatusClearSign Technologies Corporation
Nov 7, 20242024/0369452BURNER INCLUDING AN ELECTRICAL PERMITTIVITY OR ELECTRICAL CAPACITANCE FLAME SENSORThermal processes and apparatusClearSign Technologies Corporation
Jun 20, 20242024/0200771HIGH PERFORMANCE LOW NOx BURNER AND SYSTEMThermal processes and apparatusClearSign Technologies Corporation
Apr 13, 20232023/0115032ULTRA LOW EMISSIONS FIRETUBE BOILER BURNERThermal processes and apparatusClearSign Technologies Corporation
Mar 9, 20232023/0072921BURNER SYSTEM WITH DISCRETE TRANSVERSE FLAME STABILIZERSThermal processes and apparatusClearSign Technologies Corporation · patent 12,359,804 granted from it
Sep 22, 20222022/0299203BURNER AND BURNER SYSTEM WITH FLANGE MOUNTThermal processes and apparatusClearSign Technologies Corporation · patent 11,953,199 granted from it
Jun 30, 20222022/0205633PILOT STABILIZED BURNERThermal processes and apparatusClearSign Combustion Corporation
Oct 7, 20212021/0310650PERFORATED FLAME HOLDER SUPPORT MEMBER FOR STRUCTURAL INTEGRITYThermal processes and apparatusClearSign Combustion Corporation
What it applied for, 2024 to 2025: Thermal processes and apparatus 5.

A patent is counted where the owner printed on it when it was granted carries the company’s own name, a former name, the name of a subsidiary its annual report lists, or its own name with a patent-holding phrase (Technology Licensing, Intellectual Property and the like), once the legal form, case and punctuation are set aside, and prints a country that name counts in. PatentsView’s data are published under the Creative Commons Attribution 4.0 licence. Source: PatentsView's granted patents and pre-grant publications, disambiguated, from the USPTO's Open Data Portal, through Dec 31, 2025, read Oct 27, 2026.

SI Assistanton CLIR · research, not advice