with toothed rotary pistons

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Rotary-piston pumps specially adapted for elastic fluids > 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 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) > 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 18/16 with helical teeth, e.g. chevron-shaped, screw type since 1980 +1 CPC IPC+CPC Available in IPC and CPC
F04C 18/18 with similar tooth forms (F04C18/16 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
F04C 18/20 with dissimilar tooth forms (F04C18/16 takes precedence) since 1980 IPC+CPC Available in IPC and CPC