CPC Main Group
F01K 3/00 Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein (regenerating exhaust steam F01K19/00)
Filing statistics
CPC F01K 3/00 belongs to the parent subclass F01K, which recorded 27,100 patent applications worldwide between 2013 and 2023. Annual filings declined from 2,583 in 2013 to 2,181 in 2023 (-16%), peaking at 2,897 applications in 2016. 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
10 direct subcodes
Child Classifications
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- F01K 3/02 Use of accumulators and specific engine types; Control thereof
- F01K 3/06 the engine being of extraction or non-condensing type
- F01K 3/08 Use of accumulators and the plant being specially adapted for a specific use
- F01K 3/12 having two or more accumulators
- F01K 3/14 having both steam accumulator and heater, e.g. superheating accumulator (steam superheaters per se F22G)
- F01K 3/18 having heaters (having both steam accumulator and heater F01K3/14; steam heaters per se F22)
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