US3250701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of desalination membranes
Assignee: Aerojet Rocketdyne Inc
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Filing: 1965-09-15
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Granted: 1966-05-10
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Expires: 1985-09-15
Abstract
No abstract record available.
Inventors
- 👤 Ellwood R Watson
- 👤 Harry W Heidsman
- 👤 Keilin Bertram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN THE METHOD FOR REMOVING WATER FROM AQUEOUS SOLUTIONS BY REVERSE OSMOSIS WHEREIN AN INPUT STREAM OF SOLUTION TO BE PURIFIED IS FED UNDER PRESSURE TO ONE SIDE OF SEMIPERMEABLE OSMOTIC MEMBRANE AND WATER HAVING A LESSENED SOLUTE CONTENT IS WITHDRAWN FROM AN OPPOSITE SIDE OF THE MEMBRANE, THE IMPROVEMENT WHICH COMPRISES INTERMITTENTLY RELAXING THE PRESSURE ON THE INPUT STREAM WHEREBY MEMBRANE DEGRADATION IS PREVENTED AND A HIGH WATER FLUX RATE IS MAINTAINED THROUGH THE MEMBRANE.
Claim 2
Dependent Claim
76 words
IN THE METHOD FOR REMOVING WATER FROM AQUEOUS SOLUTIONS BY REVERSE OSMOSIS WHEREIN AN INPUT STREAM OF SOLUTION TO BE PURIFIED IS FED UNDER PRESSURE TO ONE SIDE OF SEMIPERMEABLE OSMOTIC MEMBRANE AND WATER HAVING A LESSENED SOLUTE CONTENT IS WITHDRAWN FROM AN OPPOSITE SIDE OF THE MEMBRANE, THE IMPROVEMENT WHICH COMPRISES INTERMITTENTLY RELAXING THE PRESSURE ON THE INPUT STREAM WHEREBY MEMBRANE DEGRADATION IS PREVENTED AND A HIGH WATER FLUX RATE IS MAINTAINED THROUGH THE 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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |