US PATENT SUBCLASS 210 / 644
.~.~ Diffusing or passing through septum selective as to material of a component in liquid/liquid solvent or colloidal extraction

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
634  DF  .~ Liquid/liquid solvent or colloidal extraction or diffusing or passing through septum selective as to material of a component of liquid; such diffusing or passing being effected by other than only an ion exchange or sorption process {11}
644.~.~ Diffusing or passing through septum selective as to material of a component in liquid/liquid solvent or colloidal extraction {2}
645  DF  .~.~.~> Biological fluid (e.g., blood, urine, etc.) {1}
648  DF  .~.~.~> Including regenerating or rehabilitating the extracting liquid in liquid/liquid solvent or colloidal extraction

DEFINITION

Classification: 210/644

Diffusing or passing through septum selective as to material of a component in liquid/liquid solvent or colloidal extraction:

(under subclass 634) Process in which a constituent of the liquid being treated diffuses through a material which acts as a barrier to other constituents of the liquid and a constituent is preferentially dissolved in a second liquid usually contacting the other side of the barrier material.

(1) Note. The selectivity of the diffusion and extraction of constituents may be due to the combination of the septum and extracting (dialysing) liquid.

(2) Note. The septum is referred to as a membrane and is generally a thin film or skinlike material and may swell or

soften but not dissolve in certain liquids.

(3) Note. The mechanism by which the constituent is separated from the liquid through the membrane is more than mere microfiltration, being based on the materials of the liquid and the membrane and is discussed in Kirk-Othmer Encyclopedia of Chemistry-dialysis-Vol. 7; and Osmosis, Osmotic Pressure and Reverse Osmosis-Vol. 14.

(4) Note. While most of the disclosures in this subclass are directed to process in which the same constituent passes through the barrier into the second liquid, a claim to a two-step process which includes liquid/liquid extraction and selective diffusion through a membrane will be placed here.