US4859535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous hollow-fiber
Assignee: Ube Corp
•
Filing: 1988-06-21
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Granted: 1989-08-22
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Expires: 2008-06-21
Abstract
Abstract A porous hollow-fiber formed of polyolefin. The fiber has a peripheral wall constituted by a plurality of relatively large rods, or strands, of the polyolefin which run substantially perpendicularly to the longitudinal direction of the hollow-fiber and a plurality of fine fibrils which extend in the longitudinal direction of the hollow-fiber between adjacent rods and are connected thereto. Groups of rectangular fine pores are formed by the rods and fine fibrils. The hollow-fiber has groups of fine pores having uniform size and configuration and is excellent in selective separation capabilities.
Inventors
- 👤 Yasushi Shinomura
- 👤 Masahiko Yamaguchi
- 👤 Koichiro Fukuzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01D5/247; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/0025; B01D67/0027; B01D69/00; B01D69/02; B01D69/08; B01D69/081; B01D71/00; B01D71/06; B01D71/26; B01D71/261; B01D71/262; B01D2325/00; B01D2325/02; B01D2325/0281; B01D2325/04; Y; Y02; Y02E; Y02E50/00; Y02E50/10; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2935; Y10T428/2973; Y10T428/2975; Y10T428/298
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A porous hollow-fiber formed of polyolefin, said fiber comprising: a peripheral wall constituted by a plurality of relatively large rods of the polyolefin which extend in a direction substantially perpendicular to the longitudinal direction of the hollow-fiber and a plurality of fine fibrils which extend in the longitudinal direction of said hollow-fiber between adjacent rods and are connected thereto, said plurality of rods and plurality of fine fibrils connected thereto forming rectangular fine pores in said wall; the wall thickness being 50-150 μm, the inside diameter of said fiber being 250-1000 μm, and the pore size measured by a bubble point method being 0.1-1.0 μm.
Claim 2
Dependent Claim
105 words
A porous hollow-fiber formed of polyolefin, said fiber comprising: a peripheral wall constituted by a plurality of relatively large rods of the polyolefin which extend in a direction substantially perpendicular to the longitudinal direction of the hollow-fiber and a plurality of fine fibrils which extend in the longitudinal direction of said hollow-fiber between adjacent rods and are connected thereto, said plurality of rods and plurality of fine fibrils connected thereto forming rectangular fine pores in said wall; the wall thickness being 50-150 μm, the inside diameter of said fiber being 250-1000 μm, and the pore size measured by a bubble point method being 0.1-1.0 μm.
Claim 3
Dependent Claim
35 words
A porous hollow-fiber according to claim 1, wherein adjacent rods are joined at ends thereof and form closed circuits extending over a length three times or more an average length (d) of said fine fibrils.
Claim 4
Dependent Claim
44 words
A porous hollow-fiber according to claim 1, wherein the size (t) of each of said rods is in the range of 0.1 μm-40 μm, and the following relationship holds between said size (t) of said rod and a size (Δl) of said fibrils: 3Δl≦t≦400Δl
Claim 5
Dependent Claim
43 words
A porous hollow-fiber according to claim 1, wherein a ratio of an average length (d) of said fine fibrils to an average interval (l) between adjacent fibrils is in the range of 2-60, and (l) is in the range of 0.02 μm-10 μm.
Claim 6
Dependent Claim
34 words
A porous hollow-fiber according to claim 1, wherein at least a part of surfaces of said peripheral wall and of the inner surfaces of said fine pores is coated with glycerine fatty acid ester.-fiber,
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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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |