US3674628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular and porous fibres
Assignee: Gambro Industries SAS
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Filing: 1969-10-27
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Granted: 1972-07-04
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Expires: 1989-10-27
Abstract
Abstract TUBULAR FIBRES SUITABLE FOR USE IN ULTRAFILTRATION, REVERSE OSMOSIS AND FOR SEPARATION PROCESSES, CONTAINING A CONTINUOUS AXIAL CHANNEL AND HAVING A SKIN OVER A PERIPHERAL EXTERNAL OR INTERNAL OPEN MICROPOROUS ZONE, ARE PREPARED BY EXTRUDING A POLYMER SOLUTION THROUGH AN ANNULAR SPINNERETTE AND COAGULATING ONE OR BOTH PERIPHERAL ZONES OF THE FIBRE.
Inventors
- 👤 Albert Fabre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:04
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/08; D; D01; D01D; D01D5/00; D01D5/24; D01D5/247; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/298
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |