US PATENT SUBCLASS 423 / 461
.~.~ Recovery or purification

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

414  DF  CARBON OR COMPOUND THEREOF {3}
445 R  DF  .~ Elemental carbon {7}
461.~.~ Recovery or purification

DEFINITION

Classification: 423/461

(under subclass 445) Processes wherein the carbon is separated from impurities.