US PATENT SUBCLASS 528 / 393
.~.~ At least one reactant contains a three-membered heterocyclic ring having two carbon and one oxygen atoms, e.g., oxirane, etc.

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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}
392  DF  .~ POLYMER OF AN ETHYLENICALLY UNSATURATED REACTANT WITH A SATURATED REACTANT {1}
393.~.~ At least one reactant contains a three-membered heterocyclic ring having two carbon and one oxygen atoms, e.g., oxirane, etc.

DEFINITION

Classification: 528/393

(under subclass 392) Subject matter wherein at least one of the reactants contains a three-membered heterocyclic ring which contains as ring atoms an oxygen atom and two carbon atoms.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, see the Glossary for a definition of the term "heterocyclic".