US PATENT SUBCLASS 91 / 528
.~.~ Control means is fluid pressure operated valve

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

508  DF  PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS {11}
525  DF  .~ With means to control the working fluid to one working member for movement relative to another without controlling the working fluid to the other working member by said means {4}
528.~.~ Control means is fluid pressure operated valve {1}
529  DF  .~.~.~> Fluid pressure operated valve controlled by a pilot valve

DEFINITION

Classification: 91/528

Control means is fluid pressure operated valve:

(under subclass 525) Apparatus wherein the means comprises a valve which is actuated by a means responsive to the application of a pressurized fluid.