US PATENT SUBCLASS 528 / 405
.~.~ With reactant which is devoid of a heterocyclic ring containing oxygen, selenium or tellurium atoms 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}
403  DF  .~ FROM HETEROCYCLIC REACTANT CONTAINING AS RING ATOMS OXYGEN, SELENIUM OR TELLURIUM, E.G., EPOXY, ETC. {7}
405.~.~ 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}

DEFINITION

Classification: 528/405

(under subclass 403) Subject matter wherein at least one heterocyclic reactant containing at least one oxygen, selenium, or tellurium atom as ring members is reacted with at least one reactant which is devoid of a heterocyclic ring containing oxygen, selenium, or tellurium as ring members.