ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

Description

F04C covers rotary-piston and oscillating-piston positive-displacement machines and pumps designed to handle liquids. These devices employ rotating or reciprocating pistons to achieve precise volumetric flow control, making them suitable for applications requiring constant displacement per cycle independent of pressure. The classification encompasses gear pumps, vane pumps, screw pumps, and similar designs where mechanical action directly displaces fixed liquid volumes, excluding reciprocating piston machines with linear motion (covered under F04B) and centrifugal or dynamic pumps.

24 direct subcodes

Child Classifications

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F04C 11/00 Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type (combinations of such pumps specially adapted for elastic fluids F04C23/00); Pumping installations (F04C13/00 takes precedence; specially adapted for elastic fluids F04C23/00; fluid gearing F16H)
F04C 13/00 Adaptations of machines or pumps for special use, e.g. for extremely high pressures (of pumps specially adapted for elastic fluids F04C25/00)
F04C 14/00 Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations (of pumps or pumping installations specially adapted for elastic fluids F04C28/00)
F04C 15/00 Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00 (of pumps specially adapted for elastic fluids F04C18/00 - F04C29/00)
F04C 18/00 Rotary-piston pumps specially adapted for elastic fluids (with fluid ring or the like F04C19/00; rotary-piston pumps in which the working-fluid is exclusively displaced by one or more reciprocating pistons F04B)
F04C 19/00 Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 2/00 Rotary-piston machines or pumps (with non-parallel axes of co-operating members F04C3/00; with the working-chamber walls at least partly resiliently deformable F04C5/00; with fluid ring or the like F04C7/00; rotary-piston pumps specially adapted for elastic fluids F04C18/00; rotary-piston machines or pumps in which the working-fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F04B)
F04C 21/00 Oscillating-piston pumps specially adapted for elastic fluids
F04C 2210/00 Fluid
F04C 2220/00 Application
F04C 2230/00 Manufacture
F04C 2240/00 Components
F04C 2250/00 Geometry
F04C 2270/00 Control; Monitoring or safety arrangements
F04C 2280/00 Arrangements for preventing or removing deposits or corrosion
F04C 23/00 Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids (F04C25/00 takes precedence)
F04C 25/00 Adaptations of pumps for special use of pumps for elastic fluids
F04C 27/00 Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
F04C 28/00 Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
F04C 29/00 Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00

Top Applicants

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

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