US PATENT SUBCLASS 208 / 316
.~.~.~ Difference is mere change in proportions of solvents

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

308  DF  FRACTIONATION {5}
311  DF  .~ Liquid extraction with solvents {11}
314  DF  .~.~ Plural stages with different oil miscible solvents {2}
316.~.~.~ Difference is mere change in proportions of solvents

DEFINITION

Classification: 208/316

(under subclass 314) Processes wherein the solvents used in each extraction contain essentially the same ingredients but differ from each other in the proportions thereof.