US PATENT SUBCLASS 525 / 349
.~.~.~.~.~ Heterocyclic ring contains sulfur and nitrogen atoms

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}
343  DF  .~.~.~ Chemical treating agent contains a sulfur atom {8}
348  DF  .~.~.~.~ Sulfur-containing heterocyclic compound {1}
349.~.~.~.~.~ Heterocyclic ring contains sulfur and nitrogen atoms

DEFINITION

Classification: 525/349

Heterocyclic ring contains sulfur and nitrogen atoms:

(under subclass 348) Subject matter wherein a compound containing at least one sulfur atom and at least one nitrogen atom as ring members of a single heterocyclic ring is present during a chemical treating operation.