US PATENT SUBCLASS 528 / 65
.~.~.~ With reactant having two -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}
59  DF  .~.~ From N=C=X reactant having at least two -C-NH-C(=X)- groups {3}
65.~.~.~ With reactant having two -XH groups {1}
66  DF  .~.~.~.~> Reactant having two -XH groups contains two or more -C-X-C- groups or two or more carboxylic acid ester groups

DEFINITION

Classification: 528/65

(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 compound which has two -XH groups.

(1) Note. In all cases the -XH functional group must be directly bonded to a carbon atom. A single carbon atom may be bonded to more than one -XH group and such a compound would meet the requirements of this subclass.

(2) Note. The carbon atom bonded to the -XH group cannot be double to a chalcogen atom.