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IPC Subgroup
F04B 27/12

having plural sets of cylinders or pistons

Introduced: January 1995

Last revised: January 2006

Full Title

Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders > having cylinders coaxial with, or parallel or inclined to, main shaft axis > having stationary cylinders > having plural sets of cylinders or pistons

Classification Context

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

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