US PATENT SUBCLASS 91 / 488
.~.~ Fluid conducting passage disposed within 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}
486  DF  .~ Motive fluid bypass to or from assembly {3}
488.~.~ Fluid conducting passage disposed within piston

DEFINITION

Classification: 91/488

(under subclass 486) Apparatus in which motive fluid is conducted to or from the motor assembly by means of a fluid conducting passage which is physically located within one of said plural pistons.