US PATENT SUBCLASS 528 / 418
.~.~ Reactant contains two or more rings each of said rings having a single oxygen and two carbon atoms

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}
418.~.~ Reactant contains two or more rings each of said rings having a single oxygen and two carbon atoms

DEFINITION

Classification: 528/418

(under subclass 403) Subject matter wherein the heterocyclic reactant contains at least two three-membered heterocyclic rings, and each of said heterocyclic rings is composed of two carbon atoms and a single oxygen atom as ring members.