US PATENT SUBCLASS 208 / 258
.~.~.~ Alkali metal

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}
255  DF  .~ Gum or gum former removal {2}
257  DF  .~.~ With metal or metal compound {3}
258.~.~.~ Alkali metal

DEFINITION

Classification: 208/258

(under subclass 257) Processes wherein elemental alkali metal is employed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

294, for other refining processes using an elemental alkali metal.