US PATENT SUBCLASS 418 / 81
.~ Annular groove or recess completely encircles rotation axis

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}
81.~ Annular groove or recess completely encircles rotation axis

DEFINITION

Classification: 418/81

(under subclass 75) Apparatus in which the abutting surface is provided with a ring-like recess or depression extending entirely around the working member axis of rotation.

(1) Note. The recess or depression may be formed by surface portions of each of a plurality of members, one of which having a surface in abutting relationship with the adjacent working member surface.