US PATENT SUBCLASS 528 / 187
.~.~.~.~.~ At least one 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}
186  DF  .~.~.~.~ Nitrogen reactant contains at least three amino-nitrogen atoms bonded to one or more carbon atoms {1}
187.~.~.~.~.~ At least one reactant contains three or more carboxylic acid groups or is derivative thereof

DEFINITION

Classification: 528/187

(under subclass 186) Subject matter wherein a reactant contains three or more carboxylic acid groups or three or more carboxylic acid derivatives or any combination thereof.