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PCE
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CPC Subgroup
F01C 20/18

characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F01C20/10)

Full Title

Control of, monitoring of, or safety arrangements for, machines or engines > characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F01C20/10)

3 direct subcodes

Child Classifications

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  • F01C 20/185
  • F01C 20/20 by changing the form of the inner or outlet contour of the working chamber
  • F01C 20/22 by changing the eccentricity between cooperating members

Top Applicants

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

  1. GE (GENERAL ELECTRIC COMPANY) US 9,989
  2. UNITED TECHNOLOGIES CORPORATION (UTC) US 8,110
  3. SAFRAN AIRCRAFT ENGINES FR 6,248
  4. HYUNDAI MOTOR COMPANY KR 4,530
  5. SIEMENS DE 4,461
  6. FORD GLOBAL TECHNOLOGIES US 4,029
  7. RAYTHEON TECHNOLOGIES CORPORATION US 3,947
  8. TOYOTA MOTOR CORPORATION JP 3,734
  9. GE (GENERAL ELECTRIC COMPANY) 3,415
  10. SCHAEFFLER TECHNOLOGIES & COMPANY DE 3,063