US PATENT SUBCLASS 91 / 442
.~ Self-opening exhaust valve held closed by inlet pressure (268)

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

418  DF  WITH MOTIVE FLUID VALVE {32}
442.~ Self-opening exhaust valve held closed by inlet pressure (268)

DEFINITION

Classification: 91/442

(under subclass 418) Apparatus in which an expansible chamber is provided with a valve to discharge motive fluid therefrom, said valve being held closed by the pressure of inlet motive fluid applied to said chamber and said valve opening automatically to permit discharge when the inlet pressure is removed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

268, for cyclically operable expansible chamber motors having relatively movable inlet and exhaust valves in which the exhaust valve is held closed by inlet pressure. NOTE "PLACEMENT OF PATENTS" IN THE CLASS DEFINITION AND THE PARAGRAPH FOLLOWING THE TITLE IN THE SCHEDULE OF THIS CLASS.