Component parts, details, or accessories, not provided for in, or of interest apart from, other groups

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
Subclass:: NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES

Filing statistics

IPC F01D 25/00 belongs to the parent subclass F01D, which recorded 110,124 patent applications worldwide between 2013 and 2023. Annual filings declined from 10,791 in 2013 to 7,906 in 2023 (-27%), peaking at 11,198 applications in 2014. The most active applicants in class F01 are GE (GENERAL ELECTRIC COMPANY) (8,496 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (7,291 applications) and SAFRAN AIRCRAFT ENGINES (5,503 applications).

Source: EPO PATSTAT, worldwide filings

10 direct subcodes

Child Classifications

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F01D 25/02 De-icing means for engines having icing phenomena
F01D 25/04 Antivibration arrangements
F01D 25/08 Cooling; Heating; Heat insulation
F01D 25/16 Arrangement of bearings; Supporting or mounting bearings in casings
F01D 25/18 Lubricating arrangements
F01D 25/24 Casings; Casing parts, e.g. diaphragms, casing fastenings
F01D 25/28 Supporting or mounting arrangements, e.g. for turbine casing
F01D 25/3 Exhaust heads, chambers, or the like
F01D 25/32 Collecting of condensation water; Drainage
F01D 25/34 Turning or inching gear

Top Applicants

Top 10 applicants by patent filingsfor class F01, 2013–2023, worldwide · Source: EPO PATSTAT

GE (GENERAL ELECTRIC COMPANY) US 8,496
UNITED TECHNOLOGIES CORPORATION (UTC) US 7,291
SAFRAN AIRCRAFT ENGINES FR 5,503
TOYOTA MOTOR CORPORATION 4,556
SIEMENS DE 3,992
HYUNDAI MOTOR COMPANY KR 3,929
RAYTHEON TECHNOLOGIES CORPORATION US 3,534
FORD GLOBAL TECHNOLOGIES US 3,407
TOYOTA MOTOR CORPORATION JP 3,042
WEICHAI POWER COMPANY 2,888