US PATENT SUBCLASS 73 / 152.28
.~.~.~ Downhole

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}
152.23  DF  .~.~ With sampling {3}
152.28.~.~.~ Downhole

DEFINITION

Classification: 73/152.28

Downhole:

(under subclass 152.23) Subject matter wherein the apparatus for the determination of a characteristic of the borehole, the casing, or the drill rigging is located within the borehole while the measurement is being made.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152.02+, for a downhole formation logging instrument.

152.18, for a downhole fluid flow instrument or a downhole fluid analysis instrument not combined with sampling means.

152.46+, for making a nonfluid flow downhole measurement in a borehole while drilling.

152.55, for making a downhole fluid test, per se, in a

borehole.