US PATENT SUBCLASS 423 / 263
RARE EARTH COMPOUND (AT. NO. 21, 39, OR 57-71)


Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

263RARE EARTH COMPOUND (AT. NO. 21, 39, OR 57-71)


DEFINITION

Classification: 423/263

(under the class definition) Products or processes in which the product is a compound of a metal which is a member of the "rare earth" or lanthanide series and which has an atomic number of 21, 39, or 57 through 71.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21.1+, for a process of treating a mixture containing a rare earth metal to obtain a compound of the metal.

SEE OR SEARCH CLASS

588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction or containment of hazardous or toxic waste containing rare earth or lanthanide elements (atomic numbers 21, 39, or 57-71).