US PATENT SUBCLASS 166 / 252.6
.~.~.~ And tracing material

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}
252.1  DF  .~.~ Including production of earth fluid by driving fluid {5}
252.6.~.~.~ And tracing material

DEFINITION

Classification: 166/252.6

And tracing material:

(under subclass 252.1) Production of earth fluid by driving fluid including step(s) of using an easily detectable composition (e.g., dye, inert gas, halocarbons, cobalt-57, carbon dioxide).

SEE OR SEARCH THIS CLASS, SUBCLASS:

250.12, for a method of measuring, testing, indicating, or locating using a tracer not requiring the use of a drive fluid.