Patent US5096640A successfully refreshed from Google Patents.
US5096640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing porous hollow fibrous tubes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1989-01-27
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Granted: 1992-03-17
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Expires: 2009-01-27
Abstract
Abstract A method of producing a highly porous melt spun fibrous tube for use as a separation medium comprising melt spinning a blend containing from 30 to 70 parts by weight of a first polymeric component and from 70 to 30 parts by weight of a second polymeric component to form a tube having a wall consisting of interpenetrating networks of the two polymeric components and, using a suitable solvent, leaching out of the tube wall one of the two polymer networks so producing a tube having a wall comprising the other polymer network.
Inventors
- 👤 Harry Brody
- 👤 Colin Dewar
- 👤 Nigel Hayman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:03
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/002; D01D; D01D5/00; D01D5/24; D01D5/28; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/88; D01F6/90; B01D2323/00; B01D2323/12; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1372; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A method of producing a highly porous melt spun fibrous tube for use as a separation medium comprising melt spinning into a tube a blend containing from 30 to 70 parts by weight of a first polymeric component and from 70 to 30 parts by weight of a second polymeric component under those conditions of shear and domain size which result in each polymer being present in the tube wall as fibrils which are substantially aligned to the axis of the tube, such aligned fibrils being interconnected to each other in a random manner, such interconnections penetrating through the fibrils such that both polymers exist in the tube wall as interpenetrating networks and, using a suitable solvent, leaching out of the tube wall one of the two interpenetrating polymer networks so producing a tube having a wall comprising the other polymer network.
Claim 2
Independent Claim
142 words
A method of producing a highly porous melt spun fibrous tube for use as a separation medium comprising melt spinning into a tube a blend containing from 30 to 70 parts by weight of a first polymeric component and from 70 to 30 parts by weight of a second polymeric component under those conditions of shear and domain size which result in each polymer being present in the tube wall as fibrils which are substantially aligned to the axis of the tube, such aligned fibrils being interconnected to each other in a random manner, such interconnections penetrating through the fibrils such that both polymers exist in the tube wall as interpenetrating networks and, using a suitable solvent, leaching out of the tube wall one of the two interpenetrating polymer networks so producing a tube having a wall comprising the other polymer network.
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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) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |