US PATENT SUBCLASS 548 / 401
.~.~.~ With preservative or stabilizer

Current as of: June, 1999
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548 /   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) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
401.~.~.~ With preservative or stabilizer

DEFINITION

Classification: 548/401

(under subclass 400) Products which contain a compound having a hetero ring consisting of one nitrogen and four carbon atoms in admixture with a preserving or stabilizing agent whose sole function is to prevent physical or chemical change.