US PATENT SUBCLASS 528 / 420
.~.~ Reactant has a three-membered ring of oxygen and two carbon and contains a nitrogen atom

Current as of: June, 1999
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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
403  DF  .~ FROM HETEROCYCLIC REACTANT CONTAINING AS RING ATOMS OXYGEN, SELENIUM OR TELLURIUM, E.G., EPOXY, ETC. {7}
420.~.~ Reactant has a three-membered ring of oxygen and two carbon and contains a nitrogen atom

DEFINITION

Classification: 528/420

(under subclass 403) Subject matter wherein a heterocyclic reactant contains at least one nitrogen atom and a single three-membered heterocyclic ring which contains two carbon atoms and one oxygen atom as ring members.