US3133137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High flow porous membranes for separating water from saline solutions
Assignee: University of California Berkeley
•
Filing: 1962-03-20
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Granted: 1964-05-12
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Expires: 1982-03-20
Abstract
No abstract record available.
Inventors
- 👤 Loeb Sidney
- 👤 Sourirajan Sriniva
- 👤 Dallas E Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0013; B01D67/0023; B01D67/003; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD FOR PREPARING A POROUS MEMBRANE ADAPTED TO SEPARATE SOLIDS FROM SOLUTION, COMPRISING: (A) DISSOLVING A FILM-FORMING CELLULOSIC ESTER AND AN AQUEOUS SOLUTION OF A PORE-PRODUCING PERCHLORATE SALT INAN ORGANIC SOLVENT; (B) CASTING SAID SOLUTION TOFORM A MEMBRANE; (C) EVAPORATING A PORTION OF SAID ORGANIC SOLVENT FOR A PREDETERMINED PERIOD OF TIME AND COMPLETEING THE SOLVENT REMOVAL BY IMMERSING THE MEMBRANE IN WATER, THE TIME BETWEEN CASTING AND IMMERSION BEING 2-4 MINUTES; AND (D) IMMERSING THE CAST MEMBRANE DIRECTLY INTO WATER AT A TEMPERATURE OF ABOUT 84* TO ABOUT 90* FOR A PREDETERMINED PERIOD OF TIME OF ABOUT 30 SECONDS AND ABOUT 18 MINUTES, SAID TIME VARYING INVERSELY WITH THE WATER TEMPERATURE.
Claim 2
Independent Claim
113 words
A METHOD FOR PREPARING A POROUS MEMBRANE ADAPTED TO SEPARATE SOLIDS FROM SOLUTION, COMPRISING: (A) DISSOLVING A FILM-FORMING CELLULOSIC ESTER AND AN AQUEOUS SOLUTION OF A PORE-PRODUCING PERCHLORATE SALT INAN ORGANIC SOLVENT; (B) CASTING SAID SOLUTION TOFORM A MEMBRANE; (C) EVAPORATING A PORTION OF SAID ORGANIC SOLVENT FOR A PREDETERMINED PERIOD OF TIME AND COMPLETEING THE SOLVENT REMOVAL BY IMMERSING THE MEMBRANE IN WATER, THE TIME BETWEEN CASTING AND IMMERSION BEING 2-4 MINUTES; AND (D) IMMERSING THE CAST MEMBRANE DIRECTLY INTO WATER AT A TEMPERATURE OF ABOUT 84* TO ABOUT 90* FOR A PREDETERMINED PERIOD OF TIME OF ABOUT 30 SECONDS AND ABOUT 18 MINUTES, SAID TIME VARYING INVERSELY WITH THE WATER TEMPERATURE.
References Cited (Backward Citations)
US2022589A
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 |