US PATENT SUBCLASS 423 / 578.1
.~.~ Purifying crude sulfur

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

511  DF  SULFUR OR COMPOUND THEREOF {4}
567.1  DF  .~ Elemental sulfur {5}
578.1.~.~ Purifying crude sulfur {1}
578.2  DF  .~.~.~> From ore

DEFINITION

Classification: 423/578.1

Purifying crude sulfur:

(under subclass 567.1) Products or processes including recovering or separating sulfur from impurities mixed therewith.