US3341441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing scale buildup during electrodialysis operation
Assignee: Veolia WTS Systems USA Inc
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Filing: 1964-01-07
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Granted: 1967-09-12
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Expires: 1984-01-07
Abstract
No abstract record available.
Inventors
- 👤 Anthony J Giuffrida
- 👤 Edgardo J Parsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/469; C02F1/4693; B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/52; C02F1/4602; C02F1/4604; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/4611; C02F2201/46115; C02F2201/4612; C02F2201/46125; C02F2201/4613
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
IN THE METHOD OF SUBSTANTIALLY PREVENTING SCALE BUILDUP IN THE ELECTRODE CHAMBERS OF AN ELECTRODIALYSIS APPARATUS DURING THE ELECTROLYTIC TRANSFER OF IONS FROM ONE SOLUTION TO ANOTHER SOLUTION IN AN APPARATUS COMPRISING A PLURALITY OF SPACED MEMBRANES ARRANGED BETWEEN TWO ELECTRODES TO DEFINE LIQUID CONTAINING CHAMBERS AND WHEREIN A DIRECT CURRENT IS PASSED ACROSS SAID MEMBRANES AND LIQUID, THE IMPROVEMENT COMPRISING PERIODICALLY REVERSING THE POLARITY OF THE DIRECT CURRENT AND SIMULTANEOUSLY REDUCING THE RATE OF FLOW OF ELECTROLYTE SOLUTION TO THE ANODE CHAMBER TO ALLOW THE ACID GENERATED IN SAID ANODE CHAMBER TO REACH A CONCENTRATION SUFFICIENT TO SUBSTANTIALLY DISSOLVE ANY SCALE CONTAINED THEREIN.
Claim 2
Dependent Claim
104 words
IN THE METHOD OF SUBSTANTIALLY PREVENTING SCALE BUILDUP IN THE ELECTRODE CHAMBERS OF AN ELECTRODIALYSIS APPARATUS DURING THE ELECTROLYTIC TRANSFER OF IONS FROM ONE SOLUTION TO ANOTHER SOLUTION IN AN APPARATUS COMPRISING A PLURALITY OF SPACED MEMBRANES ARRANGED BETWEEN TWO ELECTRODES TO DEFINE LIQUID CONTAINING CHAMBERS AND WHEREIN A DIRECT CURRENT IS PASSED ACROSS SAID MEMBRANES AND LIQUID, THE IMPROVEMENT COMPRISING PERIODICALLY REVERSING THE POLARITY OF THE DIRECT CURRENT AND SIMULTANEOUSLY REDUCING THE RATE OF FLOW OF ELECTROLYTE SOLUTION TO THE ANODE CHAMBER TO ALLOW THE ACID GENERATED IN SAID ANODE CHAMBER TO REACH A CONCENTRATION SUFFICIENT TO SUBSTANTIALLY DISSOLVE ANY SCALE CONTAINED THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |