US PATENT SUBCLASS 73 / 248
.~.~.~ Valved piston

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

861  DF  VOLUME OR RATE OF FLOW {23}
232  DF  .~ Expansible chamber {6}
239  DF  .~.~ Reciprocating piston or cylinder {8}
248.~.~.~ Valved piston

DEFINITION

Classification: 73/248

(under subclass 239) Meters wherein the piston or piston-rod carries a relatively movable valve for controlling at least one of the admission or exhaust and serves as a seat for the valve or has formed therein some of the distributing passages.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

222+,.

417, Pumps,

523+, and 545+ for expansible chamber type pumps having a valved piston.