US PATENT SUBCLASS 528 / 407
.~.~.~.~ Reactant which is devoid of a heterocyclic ring containing oxygen, selenium or tellurium as ring atoms, contains at least one nitrogen atom

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}
403  DF  .~ FROM HETEROCYCLIC REACTANT CONTAINING AS RING ATOMS OXYGEN, SELENIUM OR TELLURIUM, E.G., EPOXY, ETC. {7}
405  DF  .~.~ With reactant which is devoid of a heterocyclic ring containing oxygen, selenium or tellurium atoms as ring members {1}
406  DF  .~.~.~ Heterocyclic reactant contains at least two heterocyclic rings having oxygen, selenium or tellurium as ring members {1}
407.~.~.~.~ Reactant which is devoid of a heterocyclic ring containing oxygen, selenium or tellurium as ring atoms, contains at least one nitrogen atom

DEFINITION

Classification: 528/407

(under subclass 406) Subject matter wherein the reactant which is devoid of a heterocyclic ring containing oxygen, selenium, or tellurium as ring members contains at least one nitrogen atom.