CPC Main Group Additional Only
F23N 2229/00 Flame sensors
11 direct subcodes
Child Classifications
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- F23N 2229/02 Pilot flame sensors
- F23N 2229/04 sensitive to the colour of flames
- F23N 2229/06 with periodical shutters; Modulation signals
- F23N 2229/08 detecting flame flicker
- F23N 2229/10 comprising application of periodical fuel flow fluctuations
- F23N 2229/12 with flame rectification current detecting means
- F23N 2229/14 using two or more different types of flame sensor
- F23N 2229/16 using two or more of the same types of flame sensor
- F23N 2229/18 Flame sensor cooling means
- F23N 2229/20 Camera viewing
- F23N 2229/22 the sensor's sensitivity being variable
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