US PATENT SUBCLASS 528 / 81
.~.~.~ Reactant compound which contains at least two -C-C(=X)-X-C groups contains three or more XH groups

Current as of: June, 1999
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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}
80  DF  .~.~ With reactant compound containing at least two -C-C(=X)-X-C groups and which compound is devoid of C-NH, C=NH or C-N(H)-H groups {3}
81.~.~.~ Reactant compound which contains at least two -C-C(=X)-X-C groups contains three or more XH groups

DEFINITION

Classification: 528/81

(under subclass 80) Subject matter wherein the reactant contains at least three -XH groups.

(1) Note. In all cases the -XH groups must be bonded to a carbon atom. A compound having a carbon atom which is bonded to three or more -XH groups would meet the requirements of this subclass. The carbon atom bonded to the -XH group cannot be double bonded to a chalcogen atom.