US PATENT SUBCLASS 251 / 253
.~.~.~ Biased

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
251  DF  .~ Cam {3}
252  DF  .~.~ Co-axial or parallel axes {1}
253.~.~.~ Biased {2}
254  DF  .~.~.~.~> Bi-directional {1}
256  DF  .~.~.~.~> Encased

DEFINITION

Classification: 251/253

(under subclass 252) Devices in which the valve has one position which it will maintain under the influence of a spring or weight which comprises a biasing means.