US3170867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desalinization properties of high flow porous membranes by pressure treatment using aluminum ion
Assignee: Individual
•
Filing: 1962-05-21
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Granted: 1965-02-23
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Expires: 1982-05-21
Abstract
No abstract record available.
Inventors
- 👤 Loeb Sidney
- 👤 Gargeswari R Nagaraj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:28
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD OF SEPARATING WATER FROM AN AQUEOUS SOLUTION; (A) DISSOLVING A FILM-FORMING CELLULOSIC ESTER IN AN AQUEOUS SOLUTION OF A PORE-PRODUCING SALT IN AN ORGANIC SOLVENT; (B) CASTING THE RESULTING SOLUTION TO FORM A MEMBRANE OF SUBSTANTIALLY UNIFORM THICKNESS; (C) EVAPORATING A PORTION OF SAID ORGANIC SOLVENT FOR A PREDETERMINED PERIOD OF TIME; (D) IMMERSING THE CAST MEMBRANE IN WATER TO REMOVE SAID PORE-PRODUCING SALT; (E) HEATING THE CAST MEMBREANE IN WATER; (F) APPLYINT UNDER PRESSURE AN AQUEOUS SOLUTION TO ONE SIDE OF THE RESULTING MEMBRANE; AND (G) ADDING A SMALL CONCENTRATION OF ALUMINUM IONS TO THE AQUEOUS SOLUTION.
Claim 2
Independent Claim
100 words
A METHOD OF SEPARATING WATER FROM AN AQUEOUS SOLUTION; (A) DISSOLVING A FILM-FORMING CELLULOSIC ESTER IN AN AQUEOUS SOLUTION OF A PORE-PRODUCING SALT IN AN ORGANIC SOLVENT; (B) CASTING THE RESULTING SOLUTION TO FORM A MEMBRANE OF SUBSTANTIALLY UNIFORM THICKNESS; (C) EVAPORATING A PORTION OF SAID ORGANIC SOLVENT FOR A PREDETERMINED PERIOD OF TIME; (D) IMMERSING THE CAST MEMBRANE IN WATER TO REMOVE SAID PORE-PRODUCING SALT; (E) HEATING THE CAST MEMBREANE IN WATER; (F) APPLYINT UNDER PRESSURE AN AQUEOUS SOLUTION TO ONE SIDE OF THE RESULTING MEMBRANE; AND (G) ADDING A SMALL CONCENTRATION OF ALUMINUM IONS TO THE AQUEOUS SOLUTION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |