US3133132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High flow porous membranes for separating water from saline solutions
Assignee: University of California Berkeley
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Filing: 1960-11-29
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Granted: 1964-05-12
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Expires: 1980-11-29
Abstract
No abstract record available.
Inventors
- 👤 Loeb Sidney
- 👤 Sourirajan Srinivasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:40
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/10; B01D63/101; B01D71/00; B01D71/06; B01D71/08; B01D71/12; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131; Y10; Y10S; Y10S159/00; Y10S159/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD OF PREPARING A POROUS MEMBRANE ADAPTED TO SEPARATE SOLUTES FROM SOLUTION, COMPRISING: (A) DISSOLVING A FILM FORMING CELLULOSIC ESTER AND AN AQUEOUS SOLUTION OF A PORE PRODUCING SALT IN AN ORGANIC SOLVENT; (B) CASTING SAID SOLUTIONTO FORM A MEMBRANE OF SUBSTANTIALLY UNIFORMTHICKNESS; (C) EVAPORATING A PORTION OF SAID ORGANIC SOLVENT FOR A PREDETERMINED PERIOD OF TIME, SAID CASTING AND EVAPORATING BEING ACCOMPLISHED WITH SAID SOLUTION COOLED BELOW ROOM TEMPERATURE; AND (D) IMMERSING THE CAST MEMBRANE IN WATER TO REMOVE SAID PORE PRODUCING SALT.
Claim 2
Independent Claim
85 words
A METHOD OF PREPARING A POROUS MEMBRANE ADAPTED TO SEPARATE SOLUTES FROM SOLUTION, COMPRISING: (A) DISSOLVING A FILM FORMING CELLULOSIC ESTER AND AN AQUEOUS SOLUTION OF A PORE PRODUCING SALT IN AN ORGANIC SOLVENT; (B) CASTING SAID SOLUTIONTO FORM A MEMBRANE OF SUBSTANTIALLY UNIFORMTHICKNESS; (C) EVAPORATING A PORTION OF SAID ORGANIC SOLVENT FOR A PREDETERMINED PERIOD OF TIME, SAID CASTING AND EVAPORATING BEING ACCOMPLISHED WITH SAID SOLUTION COOLED BELOW ROOM TEMPERATURE; AND (D) IMMERSING THE CAST MEMBRANE IN WATER TO REMOVE SAID PORE PRODUCING SALT.
References Cited (Backward Citations)
US2884387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |