with toothed rotary pistons

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Rotary-piston machines or pumps > of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing > of other than internal-axis type > with toothed rotary pistons

CPC:

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) > of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing > of other than internal-axis type > with toothed rotary pistons

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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F04C 2/16 with helical teeth, e.g. chevron-shaped, screw type since 1980 +1 CPC IPC+CPC Available in IPC and CPC
F04C 2/18 with similar tooth forms (F04C2/16 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
F04C 2/20 with dissimilar tooth forms (F04C2/16 takes precedence) since 1980 IPC+CPC Available in IPC and CPC