US PATENT SUBCLASS 528 / 60
.~.~.~ With reactant compound containing three or more XH, -C(=X)-XH, -NH, =NH, or HNH groups or combination thereof

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}
59  DF  .~.~ From N=C=X reactant having at least two -C-NH-C(=X)- groups {3}
60.~.~.~ With reactant compound containing three or more XH, -C(=X)-XH, -NH, =NH, or HNH groups or combination thereof

DEFINITION

Classification: 528/60

(under subclass 59) Subject matter wherein a material containing at least one -N=C=X (X is chalcogen) group and two or more groups is reacted with a material which contains a compound having three or more -XH, NH, -NH2, C=NH or groups or contains a compound having a combination of three or more of these groups.

(1) Note. In all cases each of the functional derivatives -XH, NH, -NH2, C=NH, must be directly bonded to a carbon atom. It is permissible, however, for these functional derivatives to be bonded to different carbon atoms or to the same carbon atom. A compound having three functional derivatives bonded to a single carbon atom meets the requirement of this subclass. An anhydride formed from two carboxylic acids is considered for purposes of this subclass as having two groups.