US PATENT SUBCLASS 208 / 215
.~.~.~.~ With heavy metal sulfide

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}
209  DF  .~.~ With hydrogen {4}
213  DF  .~.~.~ With solid catalyst or absorbent {4}
215.~.~.~.~ With heavy metal sulfide

DEFINITION

Classification: 208/215

(under subclass 213) Processes wherein the solid catalyst or adsorbent is a sulfide of a heavy metal.

(1) Note. A heavy metal is one which has a specific gravity greater than 4 and includes all metals except alkali, alkaline earth, magnesium and aluminum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

293, for other refining processes wherein the treating agent contains sulfur.