US PATENT SUBCLASS 418 / 263
.~.~.~ With spring or fluid bias

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

259  DF  POSITIVELY ACTUATED VANE {4}
260  DF  .~ Cam actuated {1}
261  DF  .~.~ In opposite directions {3}
263.~.~.~ With spring or fluid bias

DEFINITION

Classification: 418/263

(under subclass 261) Apparatus in which either a resilient mechanical means or a nonsolid pressurized substance urges the vane in the other direction.