US PATENT SUBCLASS 204 / 634
.~.~.~.~.~ Alternating anion and cation selective membranes

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}
633  DF  .~.~.~.~ Both anion and cation selective membranes {1}
634.~.~.~.~.~ Alternating anion and cation selective membranes {2}
635  DF  .~.~.~.~.~.~> Tortuous path-type frame or membrane spacer
636  DF  .~.~.~.~.~.~> With foraminous or perforated membrane support or spacer (e.g., screen, perforated plate, fabric, etc.)

DEFINITION

Classification: 204/634

Alternating anion and cation selective membranes:

(under subclass 633) Apparatus in which at least 3 anion and cation selective membranes are employed in an alternating sequential array (e.g., 2 anion selective membranes separated by a cation selective membrane, etc.).