US PATENT SUBCLASS 324 / 348
.~.~ For detecting naturally occurring fields, currents, or potentials

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

323  DF  OF GEOPHYSICAL SURFACE OR SUBSURFACE IN SITU {7}
347  DF  .~ Using electrode arrays, circuits, structure, or supports {2}
348.~.~ For detecting naturally occurring fields, currents, or potentials {2}
349  DF  .~.~.~> Of the telluric type {1}
351  DF  .~.~.~> Within a borehole {2}

DEFINITION

Classification: 324/348

For detecting naturally occurring fields, currents, or potentials:

(under subclass 347) Subject matter for measuring a field, current, or potential which exists as a result of the inherent nature of the subsurface formations and not arising by virtue of an artificial current source.

(1) Note. For purposes of this subclass naturally occurring fields, currents, or potentials are considered to include those resulting from such sources as electric powerlines, electrical machinery, and underground pipes. These sources are considered a permanent part of the environment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72, for detecting potentials in a specific environment.