US PATENT SUBCLASS 528 / 189
.~.~.~.~.~ Two or more polycarboxylic acids or derivatives or mixtures 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}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
176  DF  .~.~ With polycarboxylic acid or derivative as reactant {8}
183  DF  .~.~.~ Nitrogen reactant contains at least one amino-nitrogen atom {4}
188  DF  .~.~.~.~ Reactant contains three or more carboxylic acid groups or is derivative thereof {1}
189.~.~.~.~.~ Two or more polycarboxylic acids or derivatives or mixtures thereof

DEFINITION

Classification: 528/189

(under subclass 188) Subject matter wherein two or more reactants, each containing two or more carboxylic acid groups, or two or more derivatives of acids, each containing

two or more carboxylic acid groups or a combination thereof, are utilized.