US PATENT SUBCLASS 73 / 1.72
.~.~.~ Valve

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.57  DF  .~ Fluid pressure {7}
1.71  DF  .~.~ Pressure activated device {1}
1.72.~.~.~ Valve

DEFINITION

Classification: 73/1.72

Valve:

(under subclass 1.71) Subject matter wherein the pressure activated device comprises a body that regulates the flow of gases, liquids, or loose materials through structure, as a pipe, or through an aperture by opening, closing, or obstructing a port or a passageway or movable control element of such body.