CPC Main Group
F01D 21/00 Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
Filing statistics
CPC F01D 21/00 belongs to the parent subclass F01D, which recorded 110,154 patent applications worldwide between 2013 and 2023. Annual filings declined from 11,904 in 2013 to 6,812 in 2023 (-43%). The most active applicants in class F01 are GE (GENERAL ELECTRIC COMPANY) (9,989 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (8,110 applications) and SAFRAN AIRCRAFT ENGINES (6,248 applications).
Source: EPO PATSTAT, worldwide filings
9 direct subcodes
Child Classifications
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- F01D 21/02 Shutting-down responsive to overspeed
- F01D 21/04 responsive to undesired position of rotor relative to stator , e.g. indicating such position
- F01D 21/10 responsive to unwanted deposits on blades, in working-fluid conduits or the like
- F01D 21/12 responsive to temperature
- F01D 21/14 responsive to other specific conditions
- F01D 21/16 Trip gear
- F01D 21/20 Checking operation of shut-down devices
Top Applicants
Top 10 applicants by patent filingsfor class F01, 2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 9,989
- UNITED TECHNOLOGIES CORPORATION (UTC) US 8,110
- SAFRAN AIRCRAFT ENGINES FR 6,248
- HYUNDAI MOTOR COMPANY KR 4,530
- SIEMENS DE 4,461
- FORD GLOBAL TECHNOLOGIES US 4,029
- RAYTHEON TECHNOLOGIES CORPORATION US 3,947
- TOYOTA MOTOR CORPORATION JP 3,734
- GE (GENERAL ELECTRIC COMPANY) 3,415
- SCHAEFFLER TECHNOLOGIES & COMPANY DE 3,063