US PATENT SUBCLASS 418 / 251
.~.~ With working fluid passage in abutment

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

243  DF  POSITIVELY ACTUATED ABUTMENT {4}
249  DF  .~ Fluid biased {2}
251.~.~ With working fluid passage in abutment

DEFINITION

Classification: 418/251

(under subclass 249) Apparatus in which the abutment is provided with a fluid passage means through which working fluid passes enroute to or from the working chamber.