US PATENT SUBCLASS 210 / 639
.~.~ Including prior use of additive (e.g., changing pH, etc.)

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}
639.~.~ Including prior use of additive (e.g., changing pH, etc.)

DEFINITION

Classification: 210/639

Including prior use of additive (e.g., changing ph, etc.):

(under subclass 634) Process in which a nonreactive material is added to the liquid before the extraction or diffusion.

(1) Note. The additive generally aids or perfects the extraction or diffusion, and may include as an example, a flocculant to prevent fouling of a membrane.

SEE OR SEARCH THIS CLASS, SUBCLASS:

638, for a process in which the additive chemically reacts with a component of the liquid.