US PATENT SUBCLASS 208 / 285
.~.~.~ With preliminary treatment of the 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

177  DF  REFINING {23}
283  DF  .~ With alkali or alkali earth metal compound (except clays) {1}
284  DF  .~.~ Alkali metal compound {4}
285.~.~.~ With preliminary treatment of the oil

DEFINITION

Classification: 208/285

(under subclass 284) Processes combined with a nonconversion treatment of the mineral oil prior to the treatment with the alkali metal compound.