with vanes reciprocating with respect to the inner member

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Rotary-piston pumps specially adapted for elastic fluids > having the characteristics covered by two or more of groups , , , , , or having the characteristics covered by one of these groups together with some other type of movement between co-operating members > having the movement defined in group or and relative reciprocation between the co-operating members > with vanes reciprocating with respect to the inner member

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) > having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members > having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members > with vanes reciprocating with respect to the inner member

CPC subdivides this area 3x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

IPC defines codes here since 1980.

Child Classifications

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F04C 18/3441 +3 CPC CPC only CPC only
F04C 18/3446 +1 CPC CPC only CPC only
F04C 18/3448 CPC only CPC only
F04C 18/348 the vanes positively engaging, with circumferential play, an outer rotatable member since 1980 IPC+CPC Available in IPC and CPC
F04C 18/352 the vanes being pivoted on the axis of the outer member since 1980 IPC+CPC Available in IPC and CPC