US PATENT SUBCLASS 528 / 250
.~.~.~.~ Heterocyclic compound contains a 1,2-epoxy ring

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}
230  DF  .~ FROM ALDEHYDE OR DERIVATIVE THEREOF AS REACTANT {12}
248  DF  .~.~ With heterocyclic reactant which is not an aldehyde or derivative {5}
249  DF  .~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic compound contains an oxygen atom as a ring member of the heterocyclic compound {1}
250.~.~.~.~ Heterocyclic compound contains a 1,2-epoxy ring

DEFINITION

Classification: 528/250

(under subclass 249) Subject matter wherein the heterocyclic oxygen atom is part of a three-membered ring containing one oxygen atom and two carbon atoms (i.e., 1, 2-epoxy compound).