US PATENT SUBCLASS 250 / 260
.~.~.~ Tracer being or including radioactive material


Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

253  DF  GEOLOGICAL TESTING OR IRRADIATION {3}
256  DF  .~ Well testing apparatus and methods {9}
259  DF  .~.~ With placement of tracer in or about well {1}
260.~.~.~ Tracer being or including radioactive material


DEFINITION

Classification: 250/260

(under subclass 259) Subject matter wherein the added material is radioactive or contains radioactive material entrained in a substance added to the well.

SEE OR SEARCH THIS CLASS, SUBCLASS:

259, for tracers which must be irradiated in the well before they become radioactive.

303, for methods detecting radioactive tracers generally.

493.1+, for radioactive sources which are more than a composition, recited as a source.

SEE OR SEARCH CLASS

252, Compositions,

301.1, for radioactive compositions.

424, Drug, Bio-Affecting and Body Treating Compositions,

1, for a radioactive composition for medical use.

600, Surgery,

1+, for radioactive substances applied to the body for therapeutic purposes and holders therefore.