US PATENT SUBCLASS 208 / 320
.~.~ With temperature gradient in extraction zone or between extraction zones

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}
320.~.~ With temperature gradient in extraction zone or between extraction zones

DEFINITION

Classification: 208/320

(under subclass 311) Processes wherein (1) there is maintained a difference of temperature between different locations in a single extraction zone, or (2) wherein each of several extraction zones is maintained under a different temperature.