US PATENT SUBCLASS 528 / 289
.~.~.~.~ Final product contains nitrogen atom as a member of a heterocyclic ring

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}
289.~.~.~.~ Final product contains nitrogen atom as a member of a heterocyclic ring

DEFINITION

Classification: 528/289

(under subclass 288) Subject matter wherein a final polymeric product contains a heterocyclic ring having a nitrogen atom as a ring member.

(1) Note. The final product may be formed from a heterocyclic reactant having a nitrogen atom as a ring member or may be formed from a nonheterocyclic nitrogen-containing compound. The sole requirement for placement in this subclass is that the final product contain a nitrogen atom as a ring member of a heterocyclic ring.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, see the Glossary for a definition of the term "heterocyclic".