US PATENT SUBCLASS 549 / 542
.~.~.~.~.~.~ By adsorption or by chemical reaction with impurity

Current as of: June, 1999
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549 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
512  DF  .~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons {7}
513  DF  .~.~.~.~ Processes {5}
541  DF  .~.~.~.~.~ Purification or recovery {1}
542.~.~.~.~.~.~ By adsorption or by chemical reaction with impurity

DEFINITION

Classification: 549/542

(under subclass 541) Processes whereby the purification or recovery is effected by adsorption or by chemical reaction with an impurity.