US PATENT SUBCLASS 528 / 256
.~.~.~.~ With reactant containing >NC(=O)- or >N-C(=S)- group, e.g., urea, etc.

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}
256.~.~.~.~ With reactant containing >NC(=O)- or >N-C(=S)- group, e.g., urea, etc.

DEFINITION

Classification: 528/256

(under subclass 254) Subject matter wherein a reactant containing a or group is utilized in preparing a polymer and wherein the or reactant is not an aldehyde or aldehyde derivative, or a compound having a six-membered heterocyclic ring containing three nitrogen and three carbon atoms as ring members.