CPC Main Group
F23N 3/00 Regulating air supply or draught (conjointly with fuel supply F23N1/00)
7 direct subcodes
Child Classifications
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- F23N 3/02 Regulating draught by direct pressure operation of single valves or dampers
- F23N 3/04 by operation of single valves or dampers by temperature sensitive elements
- F23N 3/06 by conjoint operation of two or more valves or dampers (by power-assisted systems F23N3/08)
- F23N 3/08 by power-assisted systems
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