US PATENT SUBCLASS 208 / 318
.~.~ With recycle of oil

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

308  DF  FRACTIONATION {5}
311  DF  .~ Liquid extraction with solvents {11}
318.~.~ With recycle of oil

DEFINITION

Classification: 208/318

(under subclass 311) Processes wherein a phase or product of an extraction step is returned to either the same or a previous extraction zone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

315, for plural stage extraction processes with different solvents including recycle of a product fraction.