US PATENT SUBCLASS 204 / 534
.~.~.~.~.~ And using bipolar membrane

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

*  DD  PROCESSES AND PRODUCTS {7}
450  DF  .~ Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14}
518  DF  .~.~ Barrier separation (e.g., using membrane, filter paper, etc.) {5}
520  DF  .~.~.~ Ion selective {8}
522  DF  .~.~.~.~ Using both anion and cation selective membranes {4}
534.~.~.~.~.~ And using bipolar membrane

DEFINITION

Classification: 204/534

And using bipolar membrane:

(under subclass 522) Process in which a membrane having anionic properties on one side and cationic properties on the other is used in combination with both anion and cation selective membranes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

537, for electrophoretic or electro-osmotic ion selective barrier separation using a bipolar membrane, but not using both anion and cation selective membranes.