US PATENT SUBCLASS 423 / 21.5
.~.~ Ion exchanging or liquid-liquid extracting

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  DF  .~ Rare earth metal (At. No. 21, 39, or 57-71) {1}
21.5.~.~ Ion exchanging or liquid-liquid extracting

DEFINITION

Classification: 423/21.5

Ion exchanging or liquid-liquid extracting:

(under subclass 21.1) Processes which include the step of (a) attracting and retaining a compound of the mixture by contact with an ion exchange substance or (b) selectively dissolving a compound in one of two immiscible liquids to effect a separation; see Glossary.