US PATENT SUBCLASS 528 / 69
.~.~ Reactant contains a single -N=C=X group


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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}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
69.~.~ Reactant contains a single -N=C=X group


DEFINITION

Classification: 528/69

(under subclass 44) Subject matter wherein at least one reactant contains only one -N=C=X group (X is chalcogen).