US PATENT SUBCLASS 528 / 424
.~.~.~ Heterocyclic nitrogen-containing ring contains a single atom of nitrogen and two atoms of carbon as ring members

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  DF  .~.~ Reactant contains nitrogen as a ring member of a heterocyclic ring {1}
424.~.~.~ Heterocyclic nitrogen-containing ring contains a single atom of nitrogen and two atoms of carbon as ring members

DEFINITION

Classification: 528/424

(under subclass 423) Subject matter wherein at least one nitrogen heterocyclic reactant contains a three-membered heterocyclic ring which has two carbon atoms and one nitrogen atom as ring members.