US PATENT SUBCLASS 528 / 292
.~.~.~.~ Nitrogen-containing polycarboxylic acid or nitrogen-containing polycarboxylic acid derivative

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}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
272  DF  .~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof {15}
288  DF  .~.~.~ Nitrogen-containing reactant {4}
292.~.~.~.~ Nitrogen-containing polycarboxylic acid or nitrogen-containing polycarboxylic acid derivative

DEFINITION

Classification: 528/292

(under subclass 288) Subject matter wherein a nitrogen atom is part of polycarboxylic acid, or is part of a derivative thereof, or is a nitrogen-containing derivative of a nonnitrogen-containing polycarboxylic acid.