US PATENT SUBCLASS 166 / 250.12
.~.~ Tracer

Current as of: June, 1999
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166 /   HD   WELLS

244.1  DF  PROCESSES {39}
250.01  DF  .~ With indicating, testing, measuring or locating {21}
250.12.~.~ Tracer

DEFINITION

Classification: 166/250.12

Tracer:

(under subclass 250.01) Indicating involving the use of an easily detectable material (e.g., dye, inert gas, halocarbons, cobalt-57, carbon dioxide).

SEE OR SEARCH THIS CLASS, SUBCLASS:

252.6, for tracing material with a driving fluid.