(under the class definition) Products, or processes for making such products, which exhibit spontaneous nuclear disintegration with emission of radioactive particles and which comprises (1) the compound of an element which is naturally unstable and has an atomic number of at least 84, (2) compound of an element which has been treated to render an isotope thereof radioactive or (3) a nonmetallic element which is naturally or has been treated to make it or an isotope thereof radioactive; see Glossary.
(1) Note. In this subclass will be found radon, astatine, or compounds thereof.
(2) Note. Compounds, of the trans-actinide elements i.e., those having atomic numbers greater than 103, will be found in this group of subclasses.
(3) Note. Patents wherein the claims are directed to making an element radioactive or to making a different isotope of a radioactive element are classified in Class 376, Induced Nuclear Reactions: Processes, Systems, and Elements, subclasses 156+ even when the element is in compound form.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2+, for a process of treating a mixture to recover therefrom a compound of a radioactive metal.
