US PATENT SUBCLASS 148 / 401
.~ Radioactive

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

400  DF  STOCK {20}
401.~ Radioactive

DEFINITION

Classification: 148/401

Radioactive:

(under subclass 400) Stock material which is claimed as being radioactive, containing an isotope of an element which is radioactive, or containing an element of which all the known isotopes are radioactive.

(1) Note. The elements of which all known isotopes are radioactive are technetium, promethium, and all the elements of atomic number 84 and higher.