US PATENT SUBCLASS 91 / 228
.~.~ Piston carries separate inlet and exhaust valves

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

218  DF  CYCLICALLY OPERABLE {34}
222  DF  .~ Distributor in piston (422) {6}
228.~.~ Piston carries separate inlet and exhaust valves

DEFINITION

Classification: 91/228

(under subclass 222) Apparatus in which the piston is provided with relatively movable valves which control inlet and exhaust passages to and from a working chamber.