US PATENT SUBCLASS 73 / 152.19
.~.~ During drilling

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}
152.19.~.~ During drilling {2}
152.21  DF  .~.~.~> Rate of fluid flow
152.22  DF  .~.~.~> Pressure

DEFINITION

Classification: 73/152.19

During drilling:

(under subclass 152.18) Subject matter wherein the determination of the characteristic of the borehole, the casing, or the drill rigging is made during the process of making or enlarging an elongated hole in the earth in situ by dislocating a solid material in the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152.03+, for formation logging during a drilling operation.

152.21, for determining a physical characteristic of a

borehole, a casing, or a drill rigging by measuring a fluid flow during drilling.

152.43+, for determining a physical characteristic of a borehole, a casing, or a drill rigging during a drilling operation.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth, 40+, for a process or an apparatus for boring into the earth combined with a measuring or indicating feature and wherein more than a mere step of boring is claimed.

250, Radiant Energy,

254, for an apparatus or a method for making a geological test using radiant energy wherein drilling is involved.

324, Electricity: Measuring and Testing,

324+, for a purely electrical measurement of a borehole fluid, subclass 356 for measuring an electrical property in a borehole while drilling, subclass 369 for well logging while drilling wherein an electrical property of an earth formation is measured, and subclass 694 for measuring resistance or conductance in order to determine water content.

356, Optics: Measuring and Testing, appropriate subclass for an apparatus or a method for testing drilling mud by measuring visible light.

436, Chemistry: Analytical and Immunological Testing,

25+, for a chemical analyzer for conducting a test within the earth's crust.