having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members

Full Title

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

Child Classifications

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• F04C 18/344 with vanes reciprocating with respect to the inner member
• F04C 18/356 with vanes reciprocating with respect to the outer member