US PATENT SUBCLASS 210 / 647
.~.~.~.~.~ Maintaining critical concentration(s)

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}
644  DF  .~.~ 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}
646  DF  .~.~.~.~ Hemodialysis {1}
647.~.~.~.~.~ Maintaining critical concentration(s)

DEFINITION

Classification: 210/647

Maintaining critical concentration(s):

(under subclass 646) Process in which the amount of at least one constituent of the treated fluid is kept at or between predetermined limits.

(1) Note. The concentration of either the constituent it is desired to remove or of some other constituent is included, e.g., maintaining the potassium level in an artificial kidney process.