US PATENT SUBCLASS 418 / 249
.~ Fluid biased

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

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

DEFINITION

Classification: 418/249

(under subclass 243) Apparatus wherein fluid under pressure exerts a force upon the abutment to move it into engagement with the working member.