US PATENT SUBCLASS 208 / 220
.~.~.~ Plural stages of sulfur removal

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

177  DF  REFINING {23}
208 R  DF  .~ Sulfur removal (free or combined sulfur) {17}
219  DF  .~.~ With acids {4}
220.~.~.~ Plural stages of sulfur removal

DEFINITION

Classification: 208/220

(under subclass 219) Processes which include desulfurization of mineral oil in plural stages, at least one of which includes the use of an acid.