US PATENT SUBCLASS 91 / 490
.~ Motive fluid supply or discharge through piston

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

472  DF  THREE OR MORE CYLINDERS ARRANGED IN PARALLEL RADIAL OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {10}
490.~ Motive fluid supply or discharge through piston

DEFINITION

Classification: 91/490

(under subclass 472) Apparatus in which there is provided passage means formed within at least one of said plural pistons and extending therethrough for the purpose of providing communication between the expansible chamber associated with said piston and a source of motive fluid supply or discharge.