US3562139A
Expired / Lapsed
US
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Cationic-anionic ion-exchange membrane
Assignee: Veolia WTS Systems USA Inc
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Filing: 1968-08-05
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Granted: 1971-02-09
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Expires: 1988-08-05
Abstract
Abstract METHOD AND APPARATUS FOR THE DEIONIZATION OF ELECTROLYTE SOLUTIONS WHEREIN ALTERNATINGLY ORIENTED ANION-CATION BILAMINATE ION-EXCHANGE MEMBRANES DEFINE THE CHAMBERS OF A MULTICHAMBER ELECTRODIALYSIS CELL AND WHEREIN THE ANION EXCHANGE LAMINAE OF EACH OF SAID MEMBRANES BOUND THE SALT DILUTING CHAMBERS AND THE CATION EXCHANGE LAMINAE BOUND THE SALT CONCENTRATING CHAMBERS. A DIRECT ELECTRIC CURRENT IS PASSED TRANSVERSELY THROUGH ALL OF SAID CHAMBERS AND MEMBRANES WHICH CURRENT IS PERIODICALLY REVERSED.
Inventors
- 👤 Frank B Leitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:04
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/445; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J2325/00; C08J2325/02; C08J2325/04; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |