US PATENT SUBCLASS 528 / 288
.~.~.~ 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}
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.~.~.~ Nitrogen-containing reactant {4}
289  DF  .~.~.~.~> Final product contains nitrogen atom as a member of a heterocyclic ring
290  DF  .~.~.~.~> Sulfur-containing reactant
291  DF  .~.~.~.~> Nitrogen-containing polyhydroxy compound or salt of a nitrogen-containing polyhydroxy compound
292  DF  .~.~.~.~> Nitrogen-containing polycarboxylic acid or nitrogen-containing polycarboxylic acid derivative

DEFINITION

Classification: 528/288

(under subclass 272) Subject matter wherein at least one reactant contains a nitrogen atom.

(1) Note. The nitrogen atom may be in a carboxylic acid or derivative thereof, or it may be in a polyhydroxyl compound or salt thereof, or it may be in an additional reactant.