US PATENT SUBCLASS 528 / 363
.~.~ With nitrogen-containing reactant

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}
363.~.~ With nitrogen-containing reactant

DEFINITION

Classification: 528/363

(under subclass 271) Subject matter for a polymer derived from at least one carboxylic acid reactant or derivative and at least one nitrogen containing reactant.