US PATENT SUBCLASS 585 / 857
.~.~.~ S dioxide, sulfolane, or sulfolene


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

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
833  DF  .~ By addition of extraneous agent, e.g., solvent, etc. {15}
856  DF  .~.~ S containing {2}
857.~.~.~ S dioxide, sulfolane, or sulfolene


DEFINITION

Classification: 585/857

S dioxide, sulfolane, or sulfolene:

(under subclass 856) Subject matter wherein an agent is one of the sulfur-oxygen compounds, sulfur dioxide (SO2), sulfolane (tetrahydrothiophene-1, 1-dioxide (Fig 1) or sulfolene (dihydrothiophene-1, 1-dioxide (Fig. 2) [figure] [caption]FIGURE 1 [figure] [caption]FIGURE 2