US PATENT SUBCLASS 208 / 319
.~.~ With pressure variation

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}
319.~.~ With pressure variation

DEFINITION

Classification: 208/319

(under subclass 311) Processes, (1) wherein there is a change in the pressure exerted on a single extraction zone to effect a separation of the phases thereof or (2) wherein each of several extraction zones is maintained under different pressure.