US PATENT SUBCLASS 528 / 66
.~.~.~.~ Reactant having two -XH groups contains two or more -C-X-C- groups or two or more carboxylic acid ester 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  DF  .~.~.~ With reactant having two -XH groups {1}
66.~.~.~.~ Reactant having two -XH groups contains two or more -C-X-C- groups or two or more carboxylic acid ester groups

DEFINITION

Classification: 528/66

(under subclass 65) Subject matter wherein the reactant containing two -XH groups also contains at least two C-X-C or at least two carboxylic acid ester groups.

(1) Note. This subclass includes hydroxyl terminated polyesters or polyethers as reactants.