US PATENT SUBCLASS 208 / 278
.~.~.~.~ Solid contact material

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

177  DF  REFINING {23}
265  DF  .~ With acids {4}
266  DF  .~.~ Sulfuric acid {7}
276  DF  .~.~.~ With nonwater additive {2}
278.~.~.~.~ Solid contact material

DEFINITION

Classification: 208/278

(under subclass 276) Processes wherein a solid material, e.g., a carrier for the acid, is employed.

(1) Note. The added material must remain in the solid state during the refining operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

299+, for processes of refining mineral oil by use of solid contact material, generally involving some manipulative solid-liquid contact procedure.