US PATENT SUBCLASS 210 / 649
.~.~ Diffusing or passing through septum selective as to material of a component of liquid

Current as of: June, 1999
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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}
649.~.~ Diffusing or passing through septum selective as to material of a component of liquid {1}
650  DF  .~.~.~> Filtering through membrane (e.g., ultrafiltration) {2}

DEFINITION

Classification: 210/649

Diffusing or passing through septum selective as to material of a component of liquid:

(under subclass 634) Process in which a constituent of a liquid migrates through a skinlike partition as set forth in the Glossary under Semipermeable membrane.

(1) Note. The process provided for in this subclass is more

than filtration or screening to a very fine stage, but includes diffusion of usually a solvent through a material based on the chemical potential of the various materials of the liquid and membrane. A rather complete treatment of the process is given in Kirk-Othmer Encyclopedia of Chemical Technology-Dialysis-Vol. 7 pp. 1-21; and Osmosis, Osmotic Pressure and Reverse Osmosis-Vol. 14, pp. 345-355.