US PATENT SUBCLASS 73 / 152.14
.~.~ With radioactivity measuring

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}
152.14.~.~ With radioactivity measuring {1}
152.15  DF  .~.~.~> With vibration measuring

DEFINITION

Classification: 73/152.14

With radioactivity measuring:

(under subclass 152.02) Subject matter including plural types of tests and wherein one of the tests makes a determination of a physical characteristic of the borehole, the casing, or the drill rigging by measuring naturally occurring radiation or radiation produced either (a) from a radiation source or (b) as a result of bombardment of elements of the formation by radiation of a different type.

SEE OR SEARCH CLASS

250, Radiant Energy,

256+, for a well testing apparatus and method measuring invisible light, subclass 257 for a well testing apparatus and method measuring invisible light and combined with detecting the location of a casing collar, and in particular, subclasses 260 and 269.1+ for a well testing device utilizing detection of radioactivity and not combined with a test other than one measuring invisible light.

378, X-Ray or Gamma Ray Systems or Devices, appropriate subclass for the application of an X-ray or gamma ray system, per se, to testing.