US PATENT SUBCLASS 73 / 152.37
.~.~ Steady state fluid flow interruption

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

152.01  DF  BOREHOLE OR DRILLING (E.G., DRILL LOADING FACTOR, DRILLING RATE, RATE OF FLUID FLOW) {6}
152.18  DF  .~ Fluid flow measuring or fluid analysis {6}
152.37.~.~ Steady state fluid flow interruption {1}
152.38  DF  .~.~.~> Drawdown or shutin test

DEFINITION

Classification: 73/152.37

Steady state fluid flow interruption:

(under subclass 152.18) Subject matter wherein the fluid usually flows at a constant rate and the determination of the characteristic of the borehole, the casing, or the drill rigging is made by interrupting the constant rate of flow of the fluid.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

40+, for flow restrictors, per se.

166, Wells,

91.1, for flow restrictors in an aboveground apparatus for a well and subclass 373 for a process of operating a valve, closure, or changeable restrictor in a well.