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)

Child Classifications

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• F04C 18/02 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 since 1980 +1 CPC IPC+CPC Available in IPC and CPC
• F04C 18/08 of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing since 1980 +1 CPC IPC+CPC Available in IPC and CPC
• F04C 18/22 of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member since 1980 IPC+CPC Available in IPC and CPC
• F04C 18/24 of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions since 1980 IPC+CPC Available in IPC and CPC
• F04C 18/30 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 since 1980 IPC+CPC Available in IPC and CPC
• F04C 18/48 Rotary-piston pumps with non-parallel axes of movement of co-operating members since 1990 IPC+CPC Available in IPC and CPC