US PATENT SUBCLASS 528 / 417
.~.~ Reactant contains a single hetero-atom in a ring and at least three carbon atoms, e.g., oxetane, 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}
403  DF  .~ FROM HETEROCYCLIC REACTANT CONTAINING AS RING ATOMS OXYGEN, SELENIUM OR TELLURIUM, E.G., EPOXY, ETC. {7}
417.~.~ Reactant contains a single hetero-atom in a ring and at least three carbon atoms, e.g., oxetane, etc.

DEFINITION

Classification: 528/417

(under subclass 403) Subject matter wherein the heterocyclic reactant contains only a single hetero atom (i.e., oxygen, sulfur, or selenium) in a ring containing three or more carbon atoms and there are no other atoms in the ring (e.g., oxetane, etc.).