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US3704218A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrodialysis method using ion exchange membranes

Assignee: Asahi Kasei Corp
•
Filing: 1969-12-16
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Granted: 1972-11-28
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Expires: 1989-12-16
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Abstract

Abstract NEGATIVELY CHARGED FIXED GROUPS AND (2) FINELY PULVERIZED WATER-SOLUBLE SOLID ELECTROLYTES GAVING NEGATIVELY CHARGED FIXED GROUPS IN THE WATER DECOMPOSITION COMPARTMENTS AND PASSING A DIRECT CURRENT BETWEEN THE ELECTRODES. POLYVALENT METAL IONS IN A VALENCE STATE OF AT LEAST 2 MAY BE ADDED TO SAID SOLUTION OR SUSPENSION. HYDROGEN IONS AND HYDROXYL IONS ARE GENERATED ECONOMICALLY IN AN ELECTRODIALYSIS CELL COMPRISIED OF A PLURALITY OF ANION EXCHANGE MEMBRANES AND CATION EXCHANGE MEMBRANES ALTERNATELY JUXTAPOSED BETWEEN A PAIR OF AN ANODE AND A CATHODE BY FILLING AQUEOUS SOLUTION OR SUSPENSION CONTAINING AT LEAST ONE ELECTROLYTE WHICH IS INCAPABLE OF PASSING THROUGH THE ION EXCHANGE MEMBRANE AND IS SELECTED FROM THE GROUP CONSISTING OF (1) WATER SOLUBLE POLYELECTROLYTES (POLYMERIC ELECTROLYTES) HAVING

Inventors

  • 👤 Masaaki Kato
  • 👤 Shigeta Sato

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 05:49
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/445

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-11-28 1976-05-29 1976-11-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-11-28 1980-05-29 1980-11-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-11-28 1984-05-29 1984-11-28 $7700.00 Window Closed / Lapsed

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