US PATENT SUBCLASS 528 / 188
.~.~.~.~ Reactant contains three or more carboxylic acid groups or is derivative 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.~.~.~.~ Reactant contains three or more carboxylic acid groups or is derivative thereof {1}
189  DF  .~.~.~.~.~> Two or more polycarboxylic acids or derivatives or mixtures thereof

DEFINITION

Classification: 528/188

(under subclass 183) Subject matter wherein a reactant contains three or more carboxylic acid groups, three or more carboxylic acid derivatives, or contains a combination thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

184, for an amino-nitrogen containing carboxylic acid or amino-containing derivative of a carboxylic acid.