US PATENT SUBCLASS 208 / 183
.~.~.~.~ With acid or alkali

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  DF  .~.~.~ One is a solid contact material {1}
183.~.~.~.~ With acid or alkali

DEFINITION

Classification: 208/183

(under subclass 182) Processes wherein, in addition to the solid contact material, an acid or an alkali metal, alkaline earth metal, magnesium or ammonium oxide, hydroxide or carbonate is employed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+, for processes of removing sulfur from raw mineral oil by use of acids.

226+, for removing sulfur from raw mineral oil by use of alkali metal or alkaline earth metal compounds.

265+, for processes of refining raw mineral oil by use of acids.

283+, for processes of refining raw mineral oil by use of alkali metal or alkaline earth compounds. SEE OR SEARCH CLASS

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.