US3310488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of desalinizing water
Assignee: University of California Berkeley
•
Filing: 1964-03-05
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Granted: 1967-03-21
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Expires: 1984-03-05
Abstract
No abstract record available.
Inventors
- 👤 Loeb Sidney
- 👤 Manjikian Serop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:44
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D61/00; B01D61/02; B01D61/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD OF RECOVERING WATER HAVING LOW SALT CONCENTRATION FROM WATER HAVING A HIGH SALT CONCENTRATION, COMPRISING: (A) DISSOLVING A FILM-FORMING CELLULOSIC DERIVATIVE IN A VOLATILE CARRIER SOLUTION ADAPTED TO PERMIT THE STRUCTURAL ORGANIZATION OF A PERMEABLE MEMBRANE FROM SAID CELLULOSIC DERIVATIVE BY EVAPORATON OF SAID CARRIER SOLUTION; (B) CASTING THE RESULTING PRODUCT SOLUTION TO FORM A THIN LAYER OF PRODUCT SOLUTION; (C) EVAPORATING A PORTION OF SAID CARRIER SOLUTION FOR A PREDETERMINED PERIOD OF TIME TO FORM A MEMBRANE; (D) IMMERSING THE CAST MEMBRANE IN WATER TO REMOVE SAID CARRIER SOLUTION; (E) HEATING THE CAST MEMBRANE IN WATER; (F) APPLYING UNDER PRESSURE TO ONE SIDE OF THE RESULTING MEMBRANE AN AQUEOUS SOLUTION HAVING A HIGH SALT CONCENTRATION; AND (G) ADDING A SMALL CONCENTRATION OF WATER-SOLUBLE CATIONIC SURFACTANT TO SAID AQUEOUS SOLUTION, AND (H) RECOVERING WATER HAVING LOW SALT CONCENTRATION FROM THE OTHER SIDE OF SAID MEMBRANE.
Claim 2
Independent Claim
147 words
A METHOD OF RECOVERING WATER HAVING LOW SALT CONCENTRATION FROM WATER HAVING A HIGH SALT CONCENTRATION, COMPRISING: (A) DISSOLVING A FILM-FORMING CELLULOSIC DERIVATIVE IN A VOLATILE CARRIER SOLUTION ADAPTED TO PERMIT THE STRUCTURAL ORGANIZATION OF A PERMEABLE MEMBRANE FROM SAID CELLULOSIC DERIVATIVE BY EVAPORATON OF SAID CARRIER SOLUTION; (B) CASTING THE RESULTING PRODUCT SOLUTION TO FORM A THIN LAYER OF PRODUCT SOLUTION; (C) EVAPORATING A PORTION OF SAID CARRIER SOLUTION FOR A PREDETERMINED PERIOD OF TIME TO FORM A MEMBRANE; (D) IMMERSING THE CAST MEMBRANE IN WATER TO REMOVE SAID CARRIER SOLUTION; (E) HEATING THE CAST MEMBRANE IN WATER; (F) APPLYING UNDER PRESSURE TO ONE SIDE OF THE RESULTING MEMBRANE AN AQUEOUS SOLUTION HAVING A HIGH SALT CONCENTRATION; AND (G) ADDING A SMALL CONCENTRATION OF WATER-SOLUBLE CATIONIC SURFACTANT TO SAID AQUEOUS SOLUTION, AND (H) RECOVERING WATER HAVING LOW SALT CONCENTRATION FROM THE OTHER SIDE OF SAID MEMBRANE.
References Cited (Backward Citations)
US3133132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |