US PATENT SUBCLASS 528 / 423
.~.~ Reactant contains nitrogen as a ring 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}
422  DF  .~ NITROGEN-CONTAINING REACTANT {1}
423.~.~ Reactant contains nitrogen as a ring member of a heterocyclic ring {1}
424  DF  .~.~.~> Heterocyclic nitrogen-containing ring contains a single atom of nitrogen and two atoms of carbon as ring members

DEFINITION

Classification: 528/423

(under subclass 422) Subject matter wherein at least one reactant contains a heterocyclic ring which has only nitrogen and carbon atoms as ring members.