US PATENT SUBCLASS 435 / 281
.~ Petroleum oil or shale oil treating

Current as of: June, 1999
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435 /   HD   CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY

262  DF  PROCESS OF UTILIZING AN ENZYME OR MICRO-ORGANISM TO DESTROY HAZARDOUS OR TOXIC WASTE, LIBERATE, SEPARATE, OR PURIFY A PREEXISTING COMPOUND OR COMPOSITION THEREFORE; CLEANING OBJECTS OR TEXTILES {8}
281.~ Petroleum oil or shale oil treating {1}
282  DF  .~.~> Desulfurizing

DEFINITION

Classification: 435/281

Petroleum oil or shale oil treating:

(under subclass 262) Processes wherein the preexisting material which is liberated or purified is petroleum or shale oil.

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9, for processes of prospecting for minerals including petroleum oils.

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166, Wells, appropriate subclasses for processes and apparatus for treating oil or an oil bearing mineral with a microorganism or enzyme while in the ground.

196, Mineral Oils: Apparatus, for apparatus for treating, refining, or recovering mineral oils such as petroleum, tar, pitch asphalt, or related products not otherwise provided for.

204, Chemistry: Electrical and Wave Energy, appropriate subclass for apparatus for treating mineral oils involving more than the mere thermal effects of the electrical or wave energy.

208, Mineral Oils: Processes and Products, for processes of treating and preparing mineral oils including their separation from sands, coal, or shales. 210, Liquid Purification or Separation, for processes and

apparatus for separating liquids including mineral oils involving no chemical treatment of the mineral oil.

299, Mining or In Situ Disintegration of Hard Material, for a process or apparatus for treating oil or oil bearing minerals while in situ in a tunnel or excavation.

423, Chemistry of Inorganic Compounds,

41, for the recovery of metal containing compounds without the reduction of the compound to pure metal.

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

135+, for compositions for or subcombination compositions for or breaking of or inhibiting of emulsion colloid systems, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art, including petroleum emulsions where there is no additional treatment of the oil. Nominal recitation of a Class 435 process (e.g., fermentation or fermentation step) combined with a process otherwise classifiable in Class 516 is proper for Class 516, while recitation of a significant Class 435 step combined with a step or composition otherwise classifiable in Class 516 is proper for Class 435 with a discretionary cross-reference to Class 516.