IPC Subgroup
F01L 9/12 with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
Introduced: January 2021
Full Title
Valve-gear or valve arrangements actuated non-mechanically > by fluid means, e.g. hydraulic > in which the action of a cam is being transmitted to a valve by a liquid column > with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- Subclass:
- CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1 direct subcode
Child Classifications
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- F01L 9/14 the volume of the chamber being variable, e.g. for varying the lift or the timing of a valve
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