US PATENT SUBCLASS 208 / 257
.~.~ With metal or metal compound

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.~.~ With metal or metal compound {3}
258  DF  .~.~.~> Alkali metal
259  DF  .~.~.~> Alkali or alkali earth metal compound (except clays)
260  DF  .~.~.~> Clay type or alumina {1}

DEFINITION

Classification: 208/257

(under subclass 255) Processes wherein a metal or a metal compound is employed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

253, for processes of removing metal contaminants wherein a metal or metal compound is employed.

283+, for other refining processes wherein an alkali or alkaline earth metal compound is employed.

294, for other refining processes wherein a free metal is employed.

295, through 297, for other processes of refining wherein metal compounds are employed.