US PATENT SUBCLASS 251 / 258
.~.~.~ Bi-directional

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


251 /   HD   VALVES AND VALVE ACTUATION

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
251  DF  .~ Cam {3}
257  DF  .~.~ Encased with seal {4}
258.~.~.~ Bi-directional

DEFINITION

Classification: 251/258

(under subclass 257) Devices in which the cam element has symmetrically arranged cam surfaces which permit actuation of the valve by rotation of an actuating stem in either of two directions.