US PATENT SUBCLASS 324 / 342
.~.~.~.~.~ Using a toroidal coil

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}
332  DF  .~ With radiant energy or nonconductive-type transmitter {2}
334  DF  .~.~ With separate pickup {4}
338  DF  .~.~.~ Within a borehole {1}
339  DF  .~.~.~.~ By induction logging {4}
342.~.~.~.~.~ Using a toroidal coil

DEFINITION

Classification: 324/342

Using a toroidal coil:

(under subclass 339) Subject matter in which one or both of the transmitter and pickup coils are in the configuration of a toroid.