US PATENT SUBCLASS 210 / 650
.~.~.~ Filtering through membrane (e.g., ultrafiltration)

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  DF  .~.~ Diffusing or passing through septum selective as to material of a component of liquid {1}
650.~.~.~ Filtering through membrane (e.g., ultrafiltration) {2}
651  DF  .~.~.~.~> Removing specified material
652  DF  .~.~.~.~> Hyperfiltration (e.g., reverse osmosis, etc.) {1}

DEFINITION

Classification: 210/650

Filtering through membrane (e.g., ultrafiltration):

(under subclass 649) Process in which a liquid is passed through a skinlike barrier which serves to retain dissolved or colloidally suspended matter, passing only those constituents which are, per se, fluid, e.g., solvent.

(1) Note. For placement in this subclass, some, but not all, dissolved matter must be retained, e.g., a solute such as protein, soluble synthetic resins or starch may be retained while ionized salts may pass through the membrane. Retention of ionized material is provided for in indented subclasses 652+.