US PATENT SUBCLASS 73 / 1.19
.~.~ Piston

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.16  DF  .~ Volume of flow, speed of flow, volume rate of flow, or mass rate of flow {12}
1.19.~.~ Piston {3}
1.21  DF  .~.~.~> With plural pistons
1.22  DF  .~.~.~> With magnetic or optical sensor
1.23  DF  .~.~.~> With position sensing switch

DEFINITION

Classification: 73/1.19

Piston:

(under subclass 1.16) Subject matter wherein the movement of a solid cylinder or disk that fits snugly into a large cylinder and moves back and forth under fluid pressure or displaces or compresses fluid is utilized for introducing a known flow volume.