US PATENT SUBCLASS 423 / 21.1
.~ Rare earth metal (At. No. 21, 39, or 57-71)

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

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
21.1.~ Rare earth metal (At. No. 21, 39, or 57-71) {1}
21.5  DF  .~.~> Ion exchanging or liquid-liquid extracting

DEFINITION

Classification: 423/21.1

Rare earth metal (At. No. 21, 39, or 57-71):

(under subclass 1) Processes in which the compound comprises one of the metals known as the "rare earth metals" and which has an atomic number of 21, 39, or 57-71, inclusive.

SEE OR SEARCH CLASS

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