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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18/00
Rotary-piston pumps specially adapted for elastic fluids
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F04C18/02
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
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F04C18/0207
both members having co-operating elements in spiral form
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F04C18/0246
Details concerning the involute wraps or their base, e.g. geometry
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F04C18/0269
Details concerning the involute wraps
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F04C18/0276
Different wall heights
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