US PATENT SUBCLASS 73 / 152.03
.~.~ 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}
152.02  DF  .~ Formation logging (e.g., borehole studies of pressure derivatives or of pressure-temperature derivatives) {8}
152.03.~.~ During drilling {1}
152.04  DF  .~.~.~> By drill mud analysis

DEFINITION

Classification: 73/152.03

During drilling:

(under subclass 152.02) Subject matter wherein the determination of the physical characteristic of the borehole is made by making a measurement of the physical condition of the borehole during the formation of or the enlargement of an elongated hole in the earth in situ by dislocating solid material of the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152.19+, for determining a physical characteristic of a borehole, a casing, or a drill rigging by measuring a fluid flow during drilling.

152.43+, for making a determination of a physical characteristic of a borehole, a casing, or a drill rigging while drilling.

SEE OR SEARCH CLASS

175, Boring or Penetrating the Earth,

50, 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.