US PATENT SUBCLASS 250 / 303
.~ Radioactive tracer methods


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

302  DF  RADIATION TRACER METHODS {1}
303.~ Radioactive tracer methods


DEFINITION

Classification: 250/303

(under subclass 302) Subject matter wherein the material is or includes a radioactive substance.

SEE OR SEARCH THIS CLASS, SUBCLASS:

260, for radioactive tracer methods used in wells.

493.1, for radioactive tracers not found elsewhere.

SEE OR SEARCH CLASS

252, Compositions, 625+, especially 646 for radioactive compositions

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

1.11+, for the class defined compositions and methods comprising a radionuclide or intended radionuclide.