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IPC Subgroup
F01B 25/02

Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity

Introduced: September 1968

Last revised: January 2006

Full Title

Regulating, controlling or safety means > Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity

Classification Context

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

4 direct subcodes

Child Classifications

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  • F01B 25/12 Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
  • F01B 25/14 peculiar to particular kinds of machines or engines

Top Applicants

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

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