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DIFF Subgroup
F01C 20/18

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

Introduced: January 2006

Title

Titles differ between systems:

IPC: characterised by varying the volume of the working chamber

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

Full Title

Full titles differ between systems:

IPC:

Control of, monitoring of, or safety arrangements for, machines or engines > characterised by varying the volume of the working chamber

CPC:

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)

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 2006.

Child Classifications

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  • F01C 20/185 CPC only CPC only
  • F01C 20/20 by changing the form of the inner or outlet contour of the working chamber since 2006 IPC+CPC Available in IPC and CPC
  • F01C 20/22 by changing the eccentricity between cooperating members since 2006 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

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