US PATENT SUBCLASS 525 / 204
.~.~.~.~.~ Heterocyclic reactant contains at least two hetero atoms in the same ring and at least one of which is nitrogen

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {4}
50  DF  .~ MIXING OF TWO OR MORE SOLID POLYMERS; MIXING OF SOLID POLYMER OR SICP WITH SICP OR SPFI; MIXING OF SICP WITH AN ETHYLENIC AGENT; MIXING OF SOLID POLYMER WITH A CHEMICAL TREATING OR ETHYLENIC AGENT; OR PROCESSES OF FORMING OR REACTING; OR THE RESULTANT PRODUCT OF ANY OF THE ABOVE OPERATIONS {32}
55  DF  .~.~ At least one solid polymer derived from ethylenic reactants only {25}
191  DF  .~.~.~ Polymer mixture of two or more solid polymers derived from ethylenically unsaturated reactants only; or mixtures of said polymer mixture with a chemical treating agent; or products or processes of preparing any of the above mixtures {23}
203  DF  .~.~.~.~ Solid polymer derived from ethylenic reactant containing a heterocyclic nitrogen {2}
204.~.~.~.~.~ Heterocyclic reactant contains at least two hetero atoms in the same ring and at least one of which is nitrogen

DEFINITION

Classification: 525/204

Heterocyclic reactant contains at least two hetero atoms in a single ring and at least one of which is nitrogen:

(under subclass 203) Subject matter wherein the nitrogen heterocycle contains two or more atoms in the same ring and wherein at least one of the hetero atoms is nitrogen.

(1) Note. The hetero ring may contain two or more nitrogen atoms or at least one nitrogen atom and at least one diverse hetero atom as oxygen, etc.