US PATENT SUBCLASS 91 / 422
.~ Valved piston (222)

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

418  DF  WITH MOTIVE FLUID VALVE {32}
422.~ Valved piston (222)

DEFINITION

Classification: 91/422

(under subclass 418) Apparatus in which the movable valve means is in or carried by a piston or piston rod of the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49, for expansible chamber motors in which motive fluid constantly applied to the working chamber is vented through the piston or rod.

163, for multiple expansion expansible chamber motors in which the motive fluid is expanded through the piston from the high pressure chamber into the low pressure chamber.

222+, for cyclically operable expansible chamber motors in which the motive fluid is supplied or exhausted through a valved piston or rod. NOTE "PLACEMENT OF PATENTS" IN THE CLASS DEFINITION AND THE PARAGRAPH FOLLOWING THE TITLE IN THE SCHEDULE OF THIS CLASS.

234, for cyclically operable valveless expansible chamber motors in which the piston has a passage for the flow of motive fluid formed therein. 376+, for expansible chamber motors having follower type feed back control valve means positioned in the piston or rod.

401, for expansible chamber motors having a valved passage in the piston or piston rod which is controlled in response to working member position.