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CPC Subgroup
F04C 28/18

characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10)

Full Title

Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids > characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10)

Filing statistics

CPC F04C 28/18 belongs to the parent subclass F04C, which recorded 51,252 patent applications worldwide between 2013 and 2023. Annual filings declined from 6,720 in 2013 to 3,771 in 2023 (-44%). The most active applicants in class F04 are LG ELECTRONICS (3,855 applications), ROBERT BOSCH (3,549 applications) and GREE ELECTRIC APPLIANCES (2,273 applications).

Source: EPO PATSTAT, worldwide filings

3 direct subcodes

Child Classifications

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  • F04C 28/185
  • F04C 28/20 by changing the form of the inner or outer contour of the working chamber
  • F04C 28/22 by changing the eccentricity between cooperating members

Top Applicants

Top 10 applicants by patent filingsfor class F04, 2013–2023, worldwide · Source: EPO PATSTAT

  1. LG ELECTRONICS KR 3,855
  2. ROBERT BOSCH DE 3,549
  3. GREE ELECTRIC APPLIANCES 2,273
  4. GE (GENERAL ELECTRIC COMPANY) US 2,126
  5. MITSUBISHI ELECTRIC CORPORATION JP 1,881
  6. UNITED TECHNOLOGIES CORPORATION (UTC) US 1,866
  7. SAFRAN AIRCRAFT ENGINES FR 1,499
  8. MITSUBISHI HEAVY INDUSTRIES JP 1,258
  9. TOYOTA INDUSTRIES CORPORATION JP 1,247
  10. ATLAS COPCO AIRPOWER BE 1,168