F03C POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS (positive- displacement engines for liquids and elastic fluids F01; positive- displacement machines for liquids F04; fluid-pressure actuators F15B; fluid gearing F16H)
Introduced: September 1968
Description
F03C covers positive-displacement engines and motors powered by pressurized liquids, including hydraulic and hydrostatic systems. This class encompasses reciprocating pumps/motors, rotary vane machines, gear motors, screw motors, and similar devices where liquid flow directly drives mechanical motion through volumetric displacement. Applications include hydraulic power transmission systems, fluid power actuators, and liquid-driven machinery in industrial and mobile equipment. Related classes F03B (water wheels and turbines) and F03D (wind motors) address alternative fluid-driven power sources.
Title
Titles differ between systems:
IPC: POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
CPC: POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS (positive- displacement engines for liquids and elastic fluids F01; positive- displacement machines for liquids F04; fluid-pressure actuators F15B; fluid gearing F16H)
Full Title
Full titles differ between systems:
POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS (positive- displacement engines for liquids and elastic fluids F01; positive- displacement machines for liquids F04; fluid-pressure actuators F15B; fluid gearing F16H)
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F03C 2/00 Rotary-piston engines (in which the liquid exclusively displaces one or more piston reciprocating in rotary cylinders F03C1/24) since 1980 IPC+CPC Available in IPC and CPC
- F03C 99/00 Subject matter not provided for in other groups of this subclass since 2010 +1 CPC IPC+CPC Available in IPC and CPC