US PATENT SUBCLASS 549 / 203
.~.~.~.~ Cyclic anhydride containing compound with preservative or stabilizer

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}
201  DF  .~.~.~ With preservative or stabilizer {4}
203.~.~.~.~ Cyclic anhydride containing compound with preservative or stabilizer

DEFINITION

Classification: 549/203

(under subclass 201) Products wherein the hetero ring is a cyclic anhydride, i.e., -C(=X)OC(=X)- is part of the ring, wherein the X's are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium or tellurium).