US PATENT SUBCLASS 528 / 259
.~.~ With >N-C(=X)-N< -containing reactant wherein X is a chalcogen atom

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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.~.~ With >N-C(=X)-N< -containing reactant wherein X is a chalcogen atom {3}
260  DF  .~.~.~> Two or more >N-C(=X)-N< -containing reactants
261  DF  .~.~.~> At least one reactant is a nonaldehyde or nonaldehyde derivative, non- >N C(=X)-N< -containing reactant {1}
264  DF  .~.~.~> >N-C(=X)-N< reactant is other than urea or thiourea per se

DEFINITION

Classification: 528/259

(under subclass 230) Subject matter wherein an aldehyde or its derivatives is reacted with at least one reactant which contains a group and wherein X is a chalcogen atom (O, S, Se, or Te).