US PATENT SUBCLASS 204 / 522
.~.~.~.~ Using both 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.~.~.~.~ Using both anion and cation selective membranes {4}
523  DF  .~.~.~.~.~> Alternating anion and cation selective membranes {8}
532  DF  .~.~.~.~.~> And using nonion selective membrane
533  DF  .~.~.~.~.~> And using ion exchange material (e.g., suspended particles, etc.)
534  DF  .~.~.~.~.~> And using bipolar membrane

DEFINITION

Classification: 204/522

Using both anion and cation selective membranes:

(under subclass 520) Process 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.