US PATENT SUBCLASS 91 / 273
.~.~.~.~ Axially seating valves

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

218  DF  CYCLICALLY OPERABLE {34}
265  DF  .~ Relatively movable inlet and exhaust valves {6}
271  DF  .~.~ Reciprocating inlet and exhaust valves {1}
272  DF  .~.~.~ Codirectional with working member movement {1}
273.~.~.~.~ Axially seating valves

DEFINITION

Classification: 91/273

(under subclass 272) Apparatus in which the inlet and exhaust valve means are of the type in which a valve member moves perpendicularly to or from its seat to close or open the fluid flow path.