US PATENT SUBCLASS 92 / 183
.~.~.~ Valved

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

172  DF  PISTON {19}
181 R  DF  .~ With fluid passage in piston face {2}
182  DF  .~.~ Passage communicates with packing receiving recess {2}
183.~.~.~ Valved

DEFINITION

Classification: 92/183

(under subclass 182) Apparatus in which the port or passage is provided with valve means for controlling the flow of fluid through the port or passage.

(1) Note. The valve means under this definition must be some means other than a means which has a valving action due to a radial movement of the radially movably wall itself.