Patent US3331772A successfully refreshed from Google Patents.
US3331772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desalting water by reverse osmosis through novel semipermeable membranes
Assignee: Atlantic Richfield Co
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Filing: 1965-08-03
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Granted: 1967-07-18
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Expires: 1985-08-03
Abstract
No abstract record available.
Inventors
- 👤 Eugene R Brownscombe
- 👤 Loyd R Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:10
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/106; B01D69/14; B01D69/141; B01D69/148; B01D61/00; B01D61/02; B01D61/025
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
A METHOD FOR PLUGGING HOLES IN A SEMIPERMEABLE MEMBRANE CONTAINED ON A POROUS SUPPORTING MEDIUM DURING A REVERSE OSMOTIC OPERATION FOR DESALTING WAER COMPRISING (A) PREPARING AN AQUEOUS SUSPENSION OF A FINELY DIVIDED OSMOTIC MATERIAL COMPOSED OF PARTICLES HAVING A DIAMETER BETWEEN ABOUT 100$ AND 0.10$, (B) INTRODUCING SAID SUSPENSION TO THE SALINE WATER BEING DESALTED, AND (C) DEPOSITING SAID OSMOTIC MATERIAL UNDER APPLIED FLUID PRESSURE SO AS TO COVER THE HOLES IN SAID MEMBRANE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |