US PATENT SUBCLASS 204 / 631
.~.~.~.~ With bipolar membrane

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

193  DF  APPARATUS {5}
600  DF  .~ Electrophoretic or electro-osmotic apparatus {11}
627  DF  .~.~ Barrier separator (e.g., electrodialyzer, etc.) {5}
630  DF  .~.~.~ Ion selective {5}
631.~.~.~.~ With bipolar membrane

DEFINITION

Classification: 204/631

With bipolar membrane:

(under subclass 630) Apparatus having a membrane with anionic

properties on one side and cationic properties on the other.