US PATENT SUBCLASS 91 / 238
.~.~.~ Pressure controlled second passage

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

218  DF  CYCLICALLY OPERABLE {34}
236  DF  .~ Multiple exhaust passages (e.g., compression control) {5}
237  DF  .~.~ Exhaust valve has separate valve controlled second exhaust passage therein {1}
238.~.~.~ Pressure controlled second passage

DEFINITION

Classification: 91/238

(under subclass 237) Apparatus in which the relatively movable means which controls the second exhaust passage is moved to cause such control by pressure of fluid within the expansible chamber.