US PATENT SUBCLASS 210 / 641
.~.~ Utilizing plural diverse membranes

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}
641.~.~ Utilizing plural diverse membranes

DEFINITION

Classification: 210/641

Utilizing plural diverse membranes:

(under subclass 634) Process in which at least two membranes of differing constitution are used.

(1) Note. The differing constitution may be different materials or the same material with identified different internal structure (e.g., different permeability, degrees of cross-linking, specified methods of making, etc.).