US PATENT SUBCLASS 585 / 833
.~ By addition of extraneous agent, e.g., solvent, etc.

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
833.~ By addition of extraneous agent, e.g., solvent, etc. {15}
834  DF  .~.~> With contact procedure involving particular apparatus or more than two moving streams
835  DF  .~.~> With fractional disengagement from agent by use of other agent
836  DF  .~.~> Different, sequentially used agents {3}
841  DF  .~.~> H
842  DF  .~.~> HF and another fluoride
843  DF  .~.~> Ag {1}
845  DF  .~.~> Cu {3}
850  DF  .~.~> Group VII or VIII transition metal-containing, e.g., Werner complex formation, etc.
851  DF  .~.~> Group III nontransition element-containing {1}
853  DF  .~.~> Alkaline metal-containing {1}
855  DF  .~.~> Metal-containing
856  DF  .~.~> S containing {2}
860  DF  .~.~> N-containing {3}
864  DF  .~.~> Organic agent {3}
868  DF  .~.~> Inorganic O-containing agent

DEFINITION

Classification: 585/833

By addition of extraneous agent, e.g., solvent, etc.:

(under subclass 800) Subject matter in which a material which does not form part of the desired product is added to the mixture to be purified or separated as an aid to such

purification or separation.

(1) Note. The mechanism by which the material aids the process may be any mechanism not provided for above, e.g., the material may be a catalyst, solvent, a complexing agent, etc.

(2) Note. This subclass (833) provides for a process wherein an acid such as HC1 is added for purification purposes; however, when the claims require an aqueous solution of such acid to be added, classification is proper in subclass 868.

SEE OR SEARCH THIS CLASS, SUBCLASS:

816, for a separation process which involves agent addition and chilling to solidify a complex formed by the agent and a component of the feed mixture.

SEE OR SEARCH CLASS

8, Bleaching and Dyeing; Fluid Treatment and Chemical Modification of Textiles and Fibers, 438, 439, and 646 for extracts which have been specifically prepared or treated to fit them for use as organic coloring material.

95, Gas Separation: Processes,

149+, for processes of gas separation using liquid contacting.

203, Distillation: Processes, Separatory,

50+, for an extractive distillation process, per se, that is, a distillation process carried out in the presence of a solvent for one or more components of the distilland.

208, Mineral Oils: Processes and Products,

31, and 33+ for processes wherein waxes are dissolved form mineral oil containing subclasses; subclass 45 for the solvent extraction of asphalts, tars, pitches, or resins from mineral oils; subclasses 311+, 390, and 400 for processes wherein mineral oils are dissolved from mineral oil containing substances; and subclass 298 for processes of refining mineral oils by treating with liquid treating agents (washing, etc.).

210, Liquid Purification or Separation,

634+, for a process of liquid-liquid extraction wherein one of the compounds purified is water or if the claims are broad as to the liquid being purified.

423, Chemistry of Inorganic Compounds, particular

658.5, and subclasses noted thereunder for a process of leaching, extracting, or dissolving when a process for purifying an inorganic or nonmetallic compound provided for in Class 423 is claimed, or when the claims are not limited and disclosure of purification of a compound for Class 423 and a compound or composition for that class is present, or a coclaimed extraction process produces products provided for in each of a plurality of other classes. 424, Drug, Bio-Affecting and Body Treating Compositions, appropriate subclasses for an extract of undetermined constitution even though from a single source, which has a utility provided for in that class; and see especially

520+, for an animal extract; and subclasses 195.1+ for a plant extract.

426, Food or Edible Material: Processes, Composition, and Products, particularly

425, and the noted subclasses thereunder for processes of making an extract having a Class 426 utility and not provided for elsewhere even though a hydrocarbon is mixed with other substances to form a product with Class 426 utility. See the Class 426 class definition, section II B (1) for an elaboration of the line between this class and Class 426.

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 hierarchically superior provision in the USPC for the specifically claimed art.