US PATENT SUBCLASS 528 / 406
.~.~.~ Heterocyclic reactant contains at least two heterocyclic rings having oxygen, selenium or tellurium as ring members


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



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.~.~.~ Heterocyclic reactant contains at least two heterocyclic rings having oxygen, selenium or tellurium as ring members {1}
407  DF  .~.~.~.~> Reactant which is devoid of a heterocyclic ring containing oxygen, selenium or tellurium as ring atoms, contains at least one nitrogen atom


DEFINITION

Classification: 528/406

(under subclass 405) Subject matter wherein the heterocyclic reactant contains at least two separate heterocyclic rings each, and wherein each ring contains at least one atom of oxygen, selenium, or tellurium as a ring member.