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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F04C2/08
of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
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F04C2/10
of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
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F04C2/1071
the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
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