US PATENT SUBCLASS 73 / 861.52
.~.~ With restriction

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

861  DF  VOLUME OR RATE OF FLOW {23}
861.42  DF  .~ Using differential pressure {6}
861.52.~.~ With restriction {4}
861.53  DF  .~.~.~> Automatically variable restriction {3}
861.59  DF  .~.~.~> Including recirculation pump
861.61  DF  .~.~.~> Orifice or flow nozzle {1}
861.63  DF  .~.~.~> Venturi {1}

DEFINITION

Classification: 73/861.52

With restriction:

(under subclass 861.42) Subject matter wherein the differential pressure is created by a restriction located in the flow path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

861.47, wherein a pressure is applied to a movable member.

861.49, wherein a pressure is applied to a liquid column or reservoir.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

40+, for flow restrictors, per se.