US PATENT SUBCLASS 418 / 25
.~.~ Positively biased in opposite directions

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

16  DF  WITH CHANGEABLE WORKING CHAMBER MAGNITUDE {10}
24  DF  .~ Spring or fluid biased movable member {2}
25.~.~ Positively biased in opposite directions {1}
26  DF  .~.~.~> With working fluid bias

DEFINITION

Classification: 418/25

(under subclass 24) Apparatus in which either the cylinder or portion thereof or the working member is urged to move in both a direction to enlarge the working chamber and a direction opposite thereto.

(1) Note. Not included herein are variable capacity devices pressure balanced by fluid or other means, the pressure balancing thereof merely facilitating ease of adjustment of the device by other means to thereby vary the working chamber dimension.