US3291730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membranes for concentration of solutions
Assignee: Aerojet Rocketdyne Inc
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Filing: 1963-09-09
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Granted: 1966-12-13
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Expires: 1983-09-09
Abstract
No abstract record available.
Inventors
- 👤 Fred E Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/44; C02F1/441; B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D71/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS OF REMOVING WATER FROM AQUEOUS SOLUTIONS CONTAINING SYNTHETIC DETERGENTS SELECTED FROM THE GROUP CONSISTING OF ALKYLBENZENE SULFONATES, ALKYLPHENOL NONIONICS, ALKANOL AMINES AND ALKANOL AMIDES WHICH COMPRISES PASSING THE AQUEOUS SOLUTION OVER ONE SIDE OF A CELULOSE ACETATE MEMBRANE AT A PRESSURE ABOVE THE OSMOTIC PRESSURE OF THE AQUEOUS SOLUTION AND RECOVERING A PRODUCT WATER OF REDUCED SYNTHETIC DETERGENT CONTENT FROM THE OTHER SIDE OF THE CELLULOSE ACETATE MEMBRANE, SAID PRODUCT WATER HAVING A SYNTHETIC DETERGENT CONTENT NOT IN EXCESS OF ABOUT THREE PARTS PER MILLION.
Claim 2
Dependent Claim
87 words
THE PROCESS OF REMOVING WATER FROM AQUEOUS SOLUTIONS CONTAINING SYNTHETIC DETERGENTS SELECTED FROM THE GROUP CONSISTING OF ALKYLBENZENE SULFONATES, ALKYLPHENOL NONIONICS, ALKANOL AMINES AND ALKANOL AMIDES WHICH COMPRISES PASSING THE AQUEOUS SOLUTION OVER ONE SIDE OF A CELULOSE ACETATE MEMBRANE AT A PRESSURE ABOVE THE OSMOTIC PRESSURE OF THE AQUEOUS SOLUTION AND RECOVERING A PRODUCT WATER OF REDUCED SYNTHETIC DETERGENT CONTENT FROM THE OTHER SIDE OF THE CELLULOSE ACETATE MEMBRANE, SAID PRODUCT WATER HAVING A SYNTHETIC DETERGENT CONTENT NOT IN EXCESS OF ABOUT THREE PARTS PER MILLION.
References Cited (Backward Citations)
US3170867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |