US3003940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing fouling of anion selective membranes
Assignee: Veolia WTS Systems USA Inc
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Filing: 1961-01-05
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Granted: 1961-10-10
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Expires: 1981-01-05
Abstract
No abstract record available.
Inventors
- 👤 Edward A Mason
- 👤 Jacob A Marinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:39
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; C02F2201/46115; C02F2209/00; C02F2209/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE METHOD OF PREVENTING FOULING OF ANION SELECTIVE MEMBRANES IN THE DEMINERALIZATION OF AQUEOUS SOLUTIONS CONTAINING MINOR QUANTITIES OF INORGANIC SALTS TO BE REMOVED THEREFROM AND CONSTITUENTS WHICH ARE SUSCEPTIBLE OF FOULING ANION SELECTIVE MEMBRANES COMPRISING: PASSING SAID SOLUTION AS A DILUTING STREAM THROUGH THE DILUTING CHAMBERS OF AN ELECTRODIALYSIS UNIT HAVING A PLURALITY OF CONCENTRATING AND DILUTING CHAMBERS DEFINED BETWEEN ALTERNATE ANION SELECTIVELY PERMEABLE AND CATION SELECTIVELY PERMEABLE MEMBRANES, PASSING A SECOND AQUEOUS SOLUTION AS A CONCENTRATING STREAM THROUGH THE ALTERNATE CONCENTRATION CHAMBERS, ADDING ACID TO THE INFLUENT CONCENTRATING STREAM SUFFICIENT TO MAINTAIN THE PH OF SAID STREAM BELOW 6.5 THROUGHOUT ITS COURSE THROUGH SAID CONCENTRATION CHAMBERS AND PASSING A DIRECT CURRENT IN SERIES TRANSVERSELY THROUGH SAID MEMBRANES AND AQUEOUS STREAMS TO EFFECT DILUTION AND CONCENTRATION OF SAID ALTERNATE STREAMS.
Claim 2
Independent Claim
131 words
THE METHOD OF PREVENTING FOULING OF ANION SELECTIVE MEMBRANES IN THE DEMINERALIZATION OF AQUEOUS SOLUTIONS CONTAINING MINOR QUANTITIES OF INORGANIC SALTS TO BE REMOVED THEREFROM AND CONSTITUENTS WHICH ARE SUSCEPTIBLE OF FOULING ANION SELECTIVE MEMBRANES COMPRISING: PASSING SAID SOLUTION AS A DILUTING STREAM THROUGH THE DILUTING CHAMBERS OF AN ELECTRODIALYSIS UNIT HAVING A PLURALITY OF CONCENTRATING AND DILUTING CHAMBERS DEFINED BETWEEN ALTERNATE ANION SELECTIVELY PERMEABLE AND CATION SELECTIVELY PERMEABLE MEMBRANES, PASSING A SECOND AQUEOUS SOLUTION AS A CONCENTRATING STREAM THROUGH THE ALTERNATE CONCENTRATION CHAMBERS, ADDING ACID TO THE INFLUENT CONCENTRATING STREAM SUFFICIENT TO MAINTAIN THE PH OF SAID STREAM BELOW 6.5 THROUGHOUT ITS COURSE THROUGH SAID CONCENTRATION CHAMBERS AND PASSING A DIRECT CURRENT IN SERIES TRANSVERSELY THROUGH SAID MEMBRANES AND AQUEOUS STREAMS TO EFFECT DILUTION AND CONCENTRATION OF SAID ALTERNATE STREAMS.
References Cited (Backward Citations)
US2671055A
Cited
GB682703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |