US PATENT SUBCLASS 208 / 182
.~.~.~ One is a solid contact material

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

177  DF  REFINING {23}
179  DF  .~ Purifying used oil {3}
181  DF  .~.~ Plural treating agents (sequential or simultaneous) {1}
182.~.~.~ One is a solid contact material {1}
183  DF  .~.~.~.~> With acid or alkali

DEFINITION

Classification: 208/182

(under subclass 181) Processes wherein at least one of the treating agents is an adsorbent or filtering material.

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299+, for processes of refining mineral oil (not used oil) wherein solid contact materials are used.

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516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

113+, for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art. Combinations of emulsion breaking and a treatment of the mineral oil provided for in Class 208 are classified in Class 208.