CPC Main Group Additional Only
F23N 2231/00 Fail safe
Filing statistics
CPC F23N 2231/00 belongs to the parent subclass F23N, which recorded 13,537 patent applications worldwide between 2013 and 2023. Annual filings declined from 1,173 in 2013 to 1,139 in 2023 (-3%), peaking at 1,525 applications in 2020. The most active applicants in class F23 are GE (GENERAL ELECTRIC COMPANY) (2,581 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (1,180 applications) and SIEMENS (1,157 applications).
Source: EPO PATSTAT, worldwide filings
13 direct subcodes
Child Classifications
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- F23N 2231/02 using electric energy accumulators
- F23N 2231/04 for electrical power failures
- F23N 2231/06 for flame failures
- F23N 2231/10 for component failures
- F23N 2231/12 for ignition failures
- F23N 2231/14 for earthquakes
- F23N 2231/16 using melting materials or shape memory alloys
- F23N 2231/18 Detecting fluid leaks
- F23N 2231/20 Warning devices
- F23N 2231/24 Freezing
- F23N 2231/26 for clogging air inlet
- F23N 2231/28 preventing flash-back or blow-back
- F23N 2231/30 Representation of working time
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