US PATENT SUBCLASS 91 / 237
.~.~ Exhaust valve has separate valve controlled second exhaust passage therein

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.~.~ Exhaust valve has separate valve controlled second exhaust passage therein {1}
238  DF  .~.~.~> Pressure controlled second passage

DEFINITION

Classification: 91/237

(under subclass 236) Apparatus comprising a valve member which moves to cyclically control a first exhaust passage, said movable valve member having a second exhaust passage therein, and relatively movable means to open and close said second exhaust passage during different phases of the cycle of operation of the motor or under different conditions of operation of the motor.