US PATENT SUBCLASS 73 / 861.42
.~ Using differential pressure

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

861  DF  VOLUME OR RATE OF FLOW {23}
861.42.~ Using differential pressure {6}
861.43  DF  .~.~> With time integration {2}
861.47  DF  .~.~> Pressure applied to movable member (e.g., a diaphragm) {1}
861.49  DF  .~.~> Pressure applied to liquid column or reservoir {1}
861.52  DF  .~.~> With restriction {4}
861.65  DF  .~.~> Pitot {3}
861.69  DF  .~.~> Centrifugal

DEFINITION

Classification: 73/861.42

Using differential pressure:

(under subclass 861) Subject matter wherein the velocity of the fluid to be metered creates a pressure differential or kinetic head across (a) a flow restriction such as a Venturi, flow nozzle or orifice plate, or (b) a Pitot or like device, which differential or head is substantially proportional to a function of the velocity of the fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

215, for Weir-type meters.

716, for differential pressure gauges including diaphragms and capable of general use.

747+, for U-type manometers capable of general use.

861.01, wherein the output from the flow meter is combined with that of another transducer for temperature compensation or the measure of mass flow.

861.39, wherein the pressure differential is created by the interaction of the fluid with a high velocity stream from a nozzle.

861.71, wherein the restriction is varied by an object in its flow path.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

40+, for flow restrictors, per se.