US PATENT SUBCLASS 73 / 253
.~.~ Rotary 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}
253.~.~ Rotary piston or cylinder {5}
254  DF  .~.~.~> With compensating bypass
255  DF  .~.~.~> With orbital movement {2}
259  DF  .~.~.~> With sliding vane
260  DF  .~.~.~> With swinging vane
261  DF  .~.~.~> With interengaging pistons

DEFINITION

Classification: 73/253

(under subclass 232) Piston Meters wherein the cylinder and piston relatively rotate about a fixed or movable axis to expand the metering chamber.

SEE OR SEARCH CLASS

418, Rotary Expansible Chamber Devices, for rotary expansible chamber devices, per se.