US PATENT SUBCLASS 208 / 39
ASPHALTS, TARS, PITCHES AND RESINS; MAKING, TREATING AND RECOVERY

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

39ASPHALTS, TARS, PITCHES AND RESINS; MAKING, TREATING AND RECOVERY {4}
40  DF  .~> By chemical conversion of oil
41  DF  .~> By distillation {1}
44  DF  .~> Chemical modification of asphalt, tar, pitch or resin
45  DF  .~> Solvent extraction

DEFINITION

Classification: 208/39

(under the class definition) Processes for preparing, separating, recovering or treating asphalts, tars, pitches and resins of mineral origin wherein the asphalt tar, resin, etc., is recovered as a product.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4+, for oxidation of mineral oils to form asphalts as well as the oxidation of asphalts, tars, pitches, or resins, per se.

8+, for processes of obtaining asphalts, tars, pitches, etc., from solid natural sources such as coal or bituminous sands or shales; the recovery of such materials from other, nonsolid natural sources is included herein (subclasses 39+).

34, for the separation of asphalt from an oil in combination with the separation of paraffin wax from another mineral oil.

309, for treatments of mineral oils to remove asphalt therefrom which is regarded as an undesirable component thereof and no steps to recover or use the asphalt are included.

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.