US PATENT SUBCLASS 528 / 421
.~.~ Reactant has a three-membered ring containing oxygen and two carbon atoms, i.e., 1,2-epoxy

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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}
421.~.~ Reactant has a three-membered ring containing oxygen and two carbon atoms, i.e., 1,2-epoxy

DEFINITION

Classification: 528/421

(under subclass 403) Subject matter wherein the heterocyclic reactant contains a single three-membered heterocyclic ring

which is composed of two carbon atoms and one oxygen atom.