US PATENT SUBCLASS 585 / 834
.~.~ With contact procedure involving particular apparatus or more than two moving streams

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

800  DF  PURIFICATION, SEPARATION, OR RECOVERY {7}
833  DF  .~ By addition of extraneous agent, e.g., solvent, etc. {15}
834.~.~ With contact procedure involving particular apparatus or more than two moving streams

DEFINITION

Classification: 585/834

With contact procedure involving particular apparatus or more than two moving streams:

(under subclass 833) Subject matter wherein contact of the feedstock with the agent is specified as taking place in an apparatus of defined structure or involves specified movement of three or more streams of material.

(1) Note. Generally more than mere nominal "counter-current contact" is required for placement in this subclass.

(2) Note. The streams generally are liquid and will involve more than merely feed, solvent, extract and raffinate

streams, for example, a reflux and/or wash stream will generally need to be flowing simultaneously to make up the three or more discrete moving streams.