US3360459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing water from solutions, using osmotic membranes treated with stabilizing agents
Assignee: Aerojet Rocketdyne Inc
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Filing: 1965-12-08
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Granted: 1967-12-26
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Expires: 1985-12-08
Abstract
No abstract record available.
Inventors
- 👤 William M King
- 👤 Charles R Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:35
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01D71/16; B01D61/00; B01D61/02; B01D61/025; B01D65/00; B01D65/08; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/00113; B01D2321/00; B01D2321/16; B01D2321/162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN THE PROCESS OF REMOVING WATER FROM AQUEOUS SOLUTIONS CONTAINING IMPURITIES, WHEREIN AQUEOUS SOLUTION IS PASSED OVER A CELLULOSE ACETATE MEMBRANE AT A PRESSURE ABOVE THE OSMOTIC PRESSURE OF THE AQUEOUS SOLUTION, THE IMPROVEMENT COMPRISING THE STEP OF ADDING PERCHLORIC ACID TO THE FEED WATER IN THE CONCENTRATION OF APPROXIMATELY FIVE TO FIVE HUNDRED PARTS PER MILLION OF FEED WATER, SAID PERCHLORIC ACID SERVING AS A STABILIZING AGENT TO SLOW THE DECLINE OF THE MEMBRANE FLUX.
Claim 2
Dependent Claim
76 words
IN THE PROCESS OF REMOVING WATER FROM AQUEOUS SOLUTIONS CONTAINING IMPURITIES, WHEREIN AQUEOUS SOLUTION IS PASSED OVER A CELLULOSE ACETATE MEMBRANE AT A PRESSURE ABOVE THE OSMOTIC PRESSURE OF THE AQUEOUS SOLUTION, THE IMPROVEMENT COMPRISING THE STEP OF ADDING PERCHLORIC ACID TO THE FEED WATER IN THE CONCENTRATION OF APPROXIMATELY FIVE TO FIVE HUNDRED PARTS PER MILLION OF FEED WATER, SAID PERCHLORIC ACID SERVING AS A STABILIZING AGENT TO SLOW THE DECLINE OF THE MEMBRANE FLUX.
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) | 1970-12-25 | 1971-06-26 | 1971-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-25 | 1975-06-26 | 1975-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-25 | 1979-06-26 | 1979-12-26 | $7700.00 | Window Closed / Lapsed |