CPC Subgroup
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
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
5 direct subcodes
Child Classifications
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- F04C 18/32 having both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members
- F04C 18/34 having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C 18/36 having both the movements defined in groups F04C18/22 and F04C18/24
- F04C 18/38 having the movement defined in group F04C18/02 and having a hinged member (F04C18/32 takes precedence)
- F04C 18/40 having the movement defined in group F04C18/08 or F04C18/22 and having a hinged member