US PATENT SUBCLASS 528 / 28
.~.~.~ Organic Si-free reactant is a nitrogen-containing 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}
10  DF  .~ FROM SILICON REACTANT HAVING AT LEAST ONE SILICON-TO-HYDROGEN OR -CARBON BOND {12}
25  DF  .~.~ With organic silicon-free reactant {4}
28.~.~.~ Organic Si-free reactant is a nitrogen-containing compound


DEFINITION

Classification: 528/28

(under subclass 25) Subject matter wherein at least one silicon-free organic reactant is a nitrogen-containing compound.