US PATENT SUBCLASS 528 / 264
.~.~.~ >N-C(=X)-N< reactant is other than urea or thiourea per se

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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}
259  DF  .~.~ With >N-C(=X)-N< -containing reactant wherein X is a chalcogen atom {3}
264.~.~.~ >N-C(=X)-N< reactant is other than urea or thiourea per se

DEFINITION

Classification: 528/264

(under subclass 259) Subject matter wherein X the - containing reactant is other than urea or thiourea, per se.

(1) Note. The materials excluded herein are urea, per se, i.e., or thiourea, per se, i.e.,