US PATENT SUBCLASS 91 / 271
.~.~ Reciprocating inlet and exhaust valves

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

218  DF  CYCLICALLY OPERABLE {34}
265  DF  .~ Relatively movable inlet and exhaust valves {6}
271.~.~ Reciprocating inlet and exhaust valves {1}
272  DF  .~.~.~> Codirectional with working member movement {1}

DEFINITION

Classification: 91/271

(under subclass 265) Apparatus in which the inlet and exhaust valve means each moves in a back and forth motion to cyclically control inlet and exhaust of motive fluid to and from a motor working chamber.