US PATENT SUBCLASS 376 / 160
.~.~.~ Subterranean

Current as of: June, 1999
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376 /   HD   INDUCED NUCLEAR REACTIONS: PROCESSES, SYSTEMS, AND ELEMENTS

156  DF  NUCLEAR TRANSMUTATION (E.G., BY MEANS OF PARTICLE OR WAVE ENERGY) {4}
158  DF  .~ By neutron bombardment {10}
159  DF  .~.~ Neutron activation analysis {1}
160.~.~.~ Subterranean {2}
161  DF  .~.~.~.~> Specific nuclides {3}
167  DF  .~.~.~.~> With tracer injection

DEFINITION

Classification: 376/160

Subterranean:

(under subclass 159) Subject matter wherein the bombardment takes place beneath the surface of the earth.

(1) Note. As between Class 376 and Class 250, subclasses 253-269.8 (well-logging), Class 376 takes all well-logging apparatus and processes involving induced nuclear reactions even if only nominally recited except when the nuclear reaction is nominally recited and the signal processing steps or apparatus are recited in detail (e.g., developing of a ratio of two signals, classification is in Class 250, subclasses 253-269.8.