US PATENT SUBCLASS 208 / 253
.~.~ With metal or metal compound

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

177  DF  REFINING {23}
251 R  DF  .~ Metal contaminant removal {3}
253.~.~ With metal or metal compound

DEFINITION

Classification: 208/253

(under subclass 251) Processes wherein an added metal or a metal compound is employed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

257+, for processes of removing gums or gum formers using metals or metal compounds.

283+, for other refining processes using alkali or alkaline earth metal compounds.

294, for other refining processes using a free metal as the treating agent.

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