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CPC Subgroup
F04B 9/133

reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor

Full Title

Piston machines or pumps characterised by the driving or driven means to or from their working members > the means being fluid > the fluid being elastic, e.g. steam or air > having plural pumping chambers > with two mechanically connected pumping members > reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor

Filing statistics

CPC F04B 9/133 belongs to the parent subclass F04B, which recorded 98,292 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,699 in 2013 to 8,239 in 2023 (+23%), peaking at 10,621 applications in 2016. 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

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