US PATENT SUBCLASS 73 / 152.43
.~ 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}
152.43.~ During drilling {3}
152.44  DF  .~.~> Drill depth rate {1}
152.46  DF  .~.~> Downhole measurement {2}
152.49  DF  .~.~> Force

DEFINITION

Classification: 73/152.43

During drilling:

(under subclass 152.01) Subject matter wherein the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made during the formation of or the enlargement of an elongated hole in the earth in situ by dislocating a solid material of the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7, for wear testing, per se.

104, for surface testing, per se.

152.03+, for formation logging during a drilling operation.

152.19+, for a determination of fluid flow during drilling.

SEE OR SEARCH CLASS 175, Boring or Penetrating the Earth,

39, for bit wear signal generating, subclasses 40+ for a process or an apparatus for boring into the earth combined with a measuring or an indicating feature 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.