US PATENT SUBCLASS 528 / 252
.~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic compound contains only two nitrogen atoms as ring members of the heterocyclic compound


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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}
252.~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic compound contains only two nitrogen atoms as ring members of the heterocyclic compound


DEFINITION

Classification: 528/252

(under subclass 248) Subject matter wherein the reactant which is not an aldehyde or derivative contains only two nitrogen atoms as ring members of a heterocyclic ring.