US PATENT SUBCLASS 528 / 359
.~.~.~ Heterocyclic ring compound is a four-membered ring containing one oxygen and three carbon atoms -C-C(=O)-O-C-

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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}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
354  DF  .~.~ From compound having -C-C(=O)-O-C- group as part of a heterocyclic ring, e.g., lactone, etc. {2}
359.~.~.~ Heterocyclic ring compound is a four-membered ring containing one oxygen and three carbon atoms -C-C(=O)-O-C-

DEFINITION

Classification: 528/359

(under subclass 354) Subject matter wherein the heterocyclic ester is a four-membered ring containing three carbon atoms and one oxygen atom, i.e., [figure]