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IPC Main Group
F04D 21/00

Pumps specially adapted for elastic fluids involving supersonic speed of pumped fluids

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
Subclass:
NON-POSITIVE-DISPLACEMENT PUMPS

Filing statistics

IPC F04D 21/00 belongs to the parent subclass F04D, which recorded 249,965 patent applications worldwide between 2013 and 2023. Annual filings grew from 13,895 in 2013 to 27,435 in 2023 (+97%), peaking at 32,121 applications in 2020. The most active applicants in class F04 are GREE ELECTRIC APPLIANCES (5,351 applications), LG ELECTRONICS (3,502 applications) and ROBERT BOSCH (3,011 applications).

Source: EPO PATSTAT, worldwide filings

Top Applicants

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

  1. GREE ELECTRIC APPLIANCES 5,351
  2. LG ELECTRONICS KR 3,502
  3. ROBERT BOSCH DE 3,011
  4. MIDEA 2,258
  5. MITSUBISHI ELECTRIC CORPORATION JP 1,663
  6. ZHUHAI LANDA COMPRESSOR COMPANY 1,639
  7. GREE ELECTRIC APPLIANCES, INC.OF ZHUHAI 1,573
  8. ZHUHAI GREE ENERGY-SAVING REFRIGERATION TECHNOLOGY RESEARCH CENTER COMPANY 1,536
  9. TOYOTA INDUSTRIES CORPORATION 1,347
  10. DAIKIN INDUSTRIES 1,325