US PATENT SUBCLASS 204 / 633
.~.~.~.~ Both 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.~.~.~.~ Both anion and cation selective membranes {1}
634  DF  .~.~.~.~.~> Alternating anion and cation selective membranes {2}

DEFINITION

Classification: 204/633

Both anion and cation selective membranes:

(under subclass 630) Apparatus in which at least one membrane selectively passes ions with a positive charge and at least one other membrane selectively passes ions with a negative charge.