of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Rotary-piston machines or pumps > of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

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 arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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F04C 2/025 CPC only CPC only
F04C 2/04 of internal axis type since 1980 +1 CPC IPC+CPC Available in IPC and CPC
F04C 2/06 of other than internal-axis type (F04C2/063 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
F04C 2/063 with coaxially-mounted members having continuously-changing circumferential spacing between them since 1980 IPC+CPC Available in IPC and CPC