US PATENT SUBCLASS 181 / 102
.~ Well logging

Current as of: June, 1999
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181 /   HD   ACOUSTICS

101  DF  GEOPHYSICAL OR SUBSURFACE EXPLORATION {5}
102.~ Well logging {4}
103  DF  .~.~> Programmed or timer-controlled
104  DF  .~.~> Directional source or detector
105  DF  .~.~> Bore hole or casing condition
106  DF  .~.~> Seismic wave generation

DEFINITION

Classification: 181/102

(under subclass 101) Subject matter wherein said geologic or subsurface structure includes a shaft or deep boring in the earth.

SEE OR SEARCH CLASS

33, Geometrical Instruments,

302, and 304+ for bore-hole direction indicators.

73, Measuring and Testing,

152.01+, for instruments, for bore-hole studies.

166, Wells, 64, 66 and 113 for well apparatus including measuring and testing means, subclasses 250.01+ for well processes including measuring and testing, and subclass 264 for processes comprising merely sampling a well fluid and appropriate subclasses (especially subclasses 142+ and the subclasses there noted) for the corresponding apparatus.

175, Boring or Penetrating the Earth,

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

250, Radiant Energy,

256+, for ray energy detection or measurement (including detection or measurement of radioactive materials) applied to bore-hole and drilling study.

324, Electricity: Measuring and Testing,

323+, for electrical testing of bore holes.

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.