US PATENT SUBCLASS 208 / 294
.~ With free metal

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

177  DF  REFINING {23}
294.~ With free metal

DEFINITION

Classification: 208/294

(under subclass 177) Processes wherein mineral oil is treated with an elemental metal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

253, for processes of removing metal contaminants by employing elemental metal.

258, for processes of removing gums or gum formers with an elemental alkali metal.

292, for refining processes wherein elemental arsenic, antimony or bismuth is used.