US PATENT SUBCLASS 585 / 604
.~.~.~ Heterocyclic

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

500  DF  UNSATURATED COMPOUND SYNTHESIS {14}
601  DF  .~ Diolefin product {4}
603  DF  .~.~ From nonhydrocarbon feed {3}
604.~.~.~ Heterocyclic {1}
605  DF  .~.~.~.~> Using P-containing catalyst

DEFINITION

Classification: 585/604

Heterocyclic:

(under subclass 603) Subject matter wherein the nonhydrocarbon feedstock is a cyclic material containing an atom other than carbon in the ring, e.g., dioxane.