CPC Subgroup Additional Only
F23N 2235/02 Air or combustion gas valves or dampers
Full Title
Valves, nozzles or pumps > Air or combustion gas valves or dampers
4 direct subcodes
Child Classifications
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- F23N 2235/04 in stacks
- F23N 2235/06 at the air intake
- F23N 2235/08 used with heat exchanges
- F23N 2235/10 power assisted, e.g. using electric motors
Top Applicants
Top 10 applicants by patent filingsfor class F23, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,581
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
- SIEMENS DE 1,157
- GE (GENERAL ELECTRIC COMPANY) 994
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
- MITSUBISHI HEAVY INDUSTRIES JP 701
- MITSUBISHI HITACHI POWER SYSTEMS JP 695
- RAYTHEON TECHNOLOGIES CORPORATION US 587
- NINGBO FOTILE KITCHENWARE COMPANY 543
- GENERAL ELECTRIC TECHNOLOGY CH 490