US PATENT SUBCLASS 521 / 135
.~.~.~ At least one polymer is derived from reactant containing two or more three membered heterocyclic rings having two carbon atoms and one chalcogen atom or polymer-forming system contains the same type of reactant

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
134  DF  .~.~ Cellular product derived from two or more solid polymers or from at least one solid polymer and at least one polymer-forming system {6}
135.~.~.~ At least one polymer is derived from reactant containing two or more three membered heterocyclic rings having two carbon atoms and one chalcogen atom or polymer-forming system contains the same type of reactant

DEFINITION

Classification: 521/135

At least one polymer is derived from reactant containing two or more three membered heterocyclic rings having two carbon atoms and one chalcogen atom or polymer-forming system contains the same type of reactant:

(under subclass 134) Subject matter wherein at least one of the polymers in the mixture is derived from a reactant which contains two or more - - groups and wherein X is a chalcogen atom.