US PATENT SUBCLASS 92 / 182
.~.~ Passage communicates with packing receiving recess

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.~.~ Passage communicates with packing receiving recess {2}
183  DF  .~.~.~> Valved
184  DF  .~.~.~> Passage in opposed piston faces {1}

DEFINITION

Classification: 92/182

(under subclass 181) Apparatus in which the port or passage communicates with a cavity in the piston, said cavity having a wall thereof which is radially movable and forming a side wall portion of the piston.