US PATENT SUBCLASS 208 / 347
.~ Distillation

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

308  DF  FRACTIONATION {5}
347.~ Distillation {12}
348  DF  .~.~> With nonvapor compound added prior to or during vaporization
349  DF  .~.~> With nonvaporization treatment of liquid condensate or residue
350  DF  .~.~> Rectification {7}
359  DF  .~.~> Spraying
360  DF  .~.~> Filming
361  DF  .~.~> Flash vaporization
362  DF  .~.~> With added gas or vapor {1}
364  DF  .~.~> Plural stages of vaporization {1}
366  DF  .~.~> Vacuum or pressure
367  DF  .~.~> With agitation of distilland
368  DF  .~.~> Condensatin by direct heat exchange
369  DF  .~.~> Volatile treatment other than condensation

DEFINITION

Classification: 208/347

(under subclass 308) Processes wherein mineral oil mixtures are volatilized for the purpose of recovering specific fractions from the vapors produced by condensation.

(1) Note. The material to be distilled is called the distilland and the products produced by condensation are called the condensate or distillate. Unvaporized material left in the still after vaporization has taken place is the residue.

(2) Note. The absence of the volatilizing or condensing steps from the process does not exclude the patent from this and indented subclasses if it is evident or well known that the process is designed to be used in connection with such step.

(3) Note. This and indented subclasses (347+) take processes of distillation of mineral oil, and patents are classified herein if distillation of mineral oil is the only species claimed or the only material disclosed. However, if distillation of a nonmineral oil is also claimed, or distillation of a nonmineral oil is disclosed with all claims being generic to both a mineral oil and a nonmineral oil, the patent is classified in Class 203, Distillation: Processes, Separatory, and cross-referenced to Class 208.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41+, for processes of preparing or recovering asphalts, tars, pitches or resins by distillation. 46+, for vaporizing processes wherein the mineral oils are heated under conditions which chemically convert the oil forming a modified mineral (e.g., reforming) or to coke.

92+, for processes for distillation of mineral oil combined with the subsequent chemical conversion thereof.

100+, for processes of chemical conversion of mineral oil combined with subsequent separating mineral oil vapors and liquid products by procedures including distillation.

184+, for processes of refining or purification of used mineral oil including distillation treatments.

313, for processes of distilling mineral oil in the presence of a solvent.

341+, for processes of recovering mineral oils from natural or converted gases by absorption combined with distillation of the rich absorbent to recover mineral oil.

SEE OR SEARCH CLASS

196, Mineral Oils: Apparatus,

98, 141 for apparatus peculiar to the distillation of mineral oil.

202, Distillation: Apparatus, appropriate subclasses, for distillation apparatus not otherwise provided for.