US PATENT SUBCLASS 208 / 208 M
.~.~ Using free alkali metal

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

177  DF  REFINING {23}
208 R  DF  .~ Sulfur removal (free or combined sulfur) {17}
208 M.~.~ Using free alkali metal

Unofficial Alpha Subclasses: R M

DEFINITION

Classification: 208/208

(under subclass 177) Processes wherein mineral oil is treated to remove sulfur therefrom, whether present as free sulfur or as a compound.

(1) Note. Processes classifiable in this or indented subclass are those wherein (1) the claims specify the removal of sulfur or (2) the disclosure is limited to the removal of sulfur. See (2) Note to subclass 177.