US PATENT SUBCLASS 523 / 142
.~.~.~ Organic polyisocyanate or derived from polyisocyanate

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF {71}
139  DF  .~.~ Composition related to metal foundry molding or metallurgical furnace or process of preparing {6}
142.~.~.~ Organic polyisocyanate or derived from polyisocyanate {1}
143  DF  .~.~.~.~> Phenolic, amine, or ketone condensate with aldehyde

DEFINITION

Classification: 523/142

Organic polyisocyanate or derived from polyisocyanate:

(under subclass 139) Subject matter wherein the composition contains or reacts with a compound containing two or more N=C=X groups (wherein X is a chalcogen, i.e., O, S, Se, or Te) or wherein a solid polymer has been derived from a reactant containing two or more N=C=X groups (wherein X is a chalcogen, i.e., O, S, Se, or Te).

(1) Note. Polyurethanes absent a disclosure to the contrary are presumed to be prepared from polyisocyanates and as such are properly classifiable herein.