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 pumps specially adapted for elastic fluids > 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 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 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.

IPC defines codes here since 1980.

Child Classifications

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F04C 18/0207 +3 CPC CPC only CPC only
F04C 18/04 of internal-axis type since 1980 +1 CPC IPC+CPC Available in IPC and CPC
F04C 18/06 of other than internal-axis type since 1980 IPC+CPC Available in IPC and CPC
F04C 18/063 with coaxially-mounted members having continuously-changing circumferential spacing between them since 1980 IPC+CPC Available in IPC and CPC