Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F04
POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
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F04C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
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2/00
Rotary-piston machines or pumps
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F04C2/30
having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
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F04C2/34
having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
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F04C2/344
with vanes reciprocating with respect to the inner member
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F04C2/3441
the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
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F04C2/3442
the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
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