US PATENT SUBCLASS 418 / 80
.~ Radially spaced grooves

Current as of: June, 1999
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418 /   HD   ROTARY EXPANSIBLE CHAMBER DEVICES

75  DF  GROOVED ABUTTING CYLINDER-ROTATING MEMBER END SURFACES {7}
80.~ Radially spaced grooves

DEFINITION

Classification: 418/80

(under subclass 75) Apparatus in which an abutting surface has a plurality of spaced shallow recesses or depressions of which at least two are spaced at unequal distances from the working member axis of rotation.

(1) Note. Two or more members may combine to form the abutting surface.