US PATENT SUBCLASS 528 / 258
.~.~.~.~ Six-membered heterocycle is other than melamine per se or methylol derivative thereof

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}
254  DF  .~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic reactant contains a six membered ring having three nitrogen and three carbon atoms as ring members {4}
258.~.~.~.~ Six-membered heterocycle is other than melamine per se or methylol derivative thereof

DEFINITION

Classification: 528/258

(under subclass 254) Subject matter wherein the heterocyclic reactant containing three nitrogen atoms and three carbon atoms is other than melamine, per se, or a methylol (-CH2OH) derivative thereof.

(1) Note. The materials herein excluded are melamine, i.e., as illustrated below, or its derivatives wherein one or more

of the available hydrogen atoms of melamine have been substituted by -CH2OH groups. [figure]