US PATENT SUBCLASS 73 / 239
.~.~ Reciprocating piston or cylinder

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.~.~ Reciprocating piston or cylinder {8}
240  DF  .~.~.~> Transversely reciprocating piston and cylinder
241  DF  .~.~.~> Oscillating cylinder
242  DF  .~.~.~> Valveless
243  DF  .~.~.~> Duplex {2}
247  DF  .~.~.~> Radial cylinder
248  DF  .~.~.~> Valved piston
249  DF  .~.~.~> With fluid actuated valve
250  DF  .~.~.~> With piston or rod actuated valve gear {1}

DEFINITION

Classification: 73/239

(under subclass 232) Meters employing one or more relatively rectilinearly reciprocating pistons and cylinders, said piston and cylinder structures cooperating to define one or more expansible measuring chambers.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices, appropriate subclasses for an expansible chamber device of the cylinder and piston type.