US PATENT SUBCLASS 348 / 85
.~.~ Borehole


Current as of: June, 1999
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348 /   HD   TELEVISION

61  DF  SPECIAL APPLICATIONS {15}
82  DF  .~ Hazardous or inaccessible {3}
85.~.~ Borehole


DEFINITION

Classification: 348/85

Borehole:

(under subclass 82) Subject matter wherein the inaccessible environment is a hole drilled in the earth (e.g., an exploratory well).

SEE OR SEARCH CLASS

33, Geometrical Instruments,

302, and 304+ for borehole directions indications.

73, Measuring and Testing,

152.01+, for instruments for borehole studies.

166, Wells,

64, and 66 for well apparatus including measuring, testing, or indicating means and subclasses 250.01+ for well processes including measuring, testing, or indicating. 175, Boring or Penetrating the Earth,

40+, for a process +or means of measuring or testing combined with an earth boring process or apparatus.

181, Acoustics,

102+, for well exploration by use of seismic prospecting systems which do not involve the handling of electric signals that contain geophysical information.

250, Radiant Energy,

256+, for ray energy detection or measurement (including detection or measurement of radioactive materials) applied to a borehole or drilling study.

324, Electricity: Measuring and Testing,

323+, for electrical testing of boreholes.

340, Communications: Electrical,

853.1+, for telemetering in wells.

367, Communications, Electrical: Acoustic Wave Systems and Devices, 25+, for seismic well logging using acoustic wave responsive electrical means.