US PATENT SUBCLASS 525 / 256
.~.~.~.~.~ Specified material contains a heterocyclic ring


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}
242  DF  .~.~.~ Polymer derived from ethylenic reactants only mixed with ethylenic reactant {21}
244  DF  .~.~.~.~ Contacting a solid polymer derived from ethylenic reactants only with an ethylenic reactant in the presence of a specified material {14}
256.~.~.~.~.~ Specified material contains a heterocyclic ring


DEFINITION

Classification: 525/256

Specified material contains a heterocyclic ring:

(under subclass 244) Subject matter wherein the specified material contains a heterocyclic ring, e.g., ethylene oxide, etc.