US PATENT SUBCLASS 527 / 401
.~.~ With N=C=X reactant wherein X is chalcogen or polyepoxide reactant

Current as of: June, 1999
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527 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {6}
400  DF  .~ FROM LIGNIN, TANNIN, OR DERIVATIVE REACTANT {2}
401.~.~ With N=C=X reactant wherein X is chalcogen or polyepoxide reactant

DEFINITION

Classification: 527/401

With N=C=X reactant wherein X is chalcogen; or with polyepoxide reactant:

(under subclass 400) Subject matter wherein a N=C=X reactant or polyepoxide reactant is present in addition to the lignin, tannin, or derivative.

(1) Note. X is chalcogen (i.e., O, S, Se, Te).

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, Glossary, for a definition of "polyepoxide".