US PATENT SUBCLASS 204 / 523
.~.~.~.~.~ Alternating anion and cation selective membranes

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}
523.~.~.~.~.~ Alternating anion and cation selective membranes {8}
524  DF  .~.~.~.~.~.~> And using ion exchange material (e.g., suspended particles, etc.)
525  DF  .~.~.~.~.~.~> With prevention of scale buildup or fouling of membrane
526  DF  .~.~.~.~.~.~> Gas or vapor treated
527  DF  .~.~.~.~.~.~> Biological material prepared, recovered, or treated (e.g., urine, etc.)
528  DF  .~.~.~.~.~.~> Regeneration of liquid electrolyte
529  DF  .~.~.~.~.~.~> Metal or metal salt recovered or removed
530  DF  .~.~.~.~.~.~> Organic material prepared, recovered, or treated
531  DF  .~.~.~.~.~.~> Acid prepared, recovered, or treated

DEFINITION

Classification: 204/523

Alternating anion and cation selective membranes:

(under subclass 522) Process 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.).