CPC Main Group
F01K 25/00 Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
Filing statistics
CPC F01K 25/00 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
5 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- F01K 25/02 the fluid remaining in the liquid phase
- F01K 25/04 the fluid being in different phases, e.g. foamed
- F01K 25/06 using mixtures of different fluids (plants using mixtures of steam and gas F01K21/04)
- F01K 25/08 using special vapours
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