US PATENT SUBCLASS 585 / 802
.~ By plural serial diverse separations

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

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
802.~ By plural serial diverse separations {3}
803  DF  .~.~> To recover alicyclic
804  DF  .~.~> To recover aromatic {3}
809  DF  .~.~> To recover unsaturate {2}

DEFINITION

Classification: 585/802

By plural serial diverse separations:

(under subclass 800) Subject matter wherein a feedstock containing the hydrocarbon material is subjected to a series of separation procedures which differ from each other in their mechanism, usually to separate the starting mixture into more than two components, to nullify the effect of more than one component, to free the recoverable material from a byproduct of the separation process, etc.

(1) Note. A mere nominal "separating", "settling", or "filtering" step following the addition of a material to the hydrocarbon mixture is not sufficient for classification herein.

(2) Note. A mere reversal of the procedure employed in a first step, e.g., desorption after sorption, removal of a solvent from the extract phase, etc., is not considered to be a plural diverse separation procedure even when the reversal is practiced fractionally. See subclasses 825, 835, and 839 below.

(3) Note. Addition of a material to the feed, e.g., a complexing agent, solvent, etc., to facilitate subsequent crystal formation by chilling, is not sufficient for classification herein. See subclass 816 below.

(4) Note. Diversity exists when the separation mechanisms are provided for in different classes of the Patent and Trademark Office classification, including some different main line subclassifications in Classes 95, Gas Separation: Processes; 62, Refrigeration; 210, Liquid Purification or Separation or in different "one indent" subclasses subsumed by subclass 800.

SEE OR SEARCH CLASS

203, Distillation: Processes, Separatory, for a distillation process preceded by a chemical reaction which facilitates the distillation or followed by a diverse separation procedure which does not involve a chemical reaction.