US PATENT SUBCLASS 418 / 230
.~.~ Positively biased

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

228  DF  AXIALLY MOVING VANE OR ABUTMENT {2}
229  DF  .~ Sliding {1}
230.~.~ Positively biased {1}
231  DF  .~.~.~> In opposite directions {1}

DEFINITION

Classification: 418/230

(under subclass 229) Apparatus in which the vane or abutment is positively moved in at least one direction by means other than the cylinder or working member surface respectively or another vane or abutment and is moved incident to the expansion and contraction of the working chamber.