US3780147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making high flow porous reverse osmosis membranes containing lipids
Assignee: Graftech Technology LLC
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Filing: 1970-12-09
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Granted: 1973-12-18
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Expires: 1990-12-09
Abstract
Abstract A SEMI-PERMEABLE MEMBRANE CONTAINING A SUPPORTIVE LAYER AND A LIPID CONTAINING OSMOTIC SKIN LAYER OF POLYMERIC FILM FORMING CELLULOSIC MATERIAL IS MADE BY (1) ADMIXING FILM FORMING CELLULOSIC MATERIAL, SOLVENT, SWELLING ADDITIVE AND LIPID TO PROVIDE A CASTING SOLUTION (2) CASTING A FILM FROM THE SOLUTION (3) DRYING THE FILM (4) LEACHING THE FILM TO FORM A SEMI-PERMEABLE OSMOTIC SKIN MEMBRANE CONTAINING A RESIDUE OF LIPID, AND (5) OPTIONALLY CURING THE MEMBRANE.
Inventors
- 👤 R Stana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/22; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D71/14; B01D2323/00; B01D2323/15; B01D2323/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |