Patent US4250554A successfully refreshed from Google Patents.
Patent US4288494A successfully refreshed from Google Patents.
US4288494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-uniform cross-sectional area hollow fibers
Assignee: Janssen Pharmaceuticals Inc
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Filing: 1979-03-12
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Granted: 1981-09-08
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Expires: 1999-03-12
Abstract
Abstract Hollow fibers, particularly useful as semipermeable membranes in separatory devices such as blood dialyzers, having a non-uniform cross-sectional area along the length thereof. The fibers have recurring points of maximum outside diameter and minimum outside diameter and such points may recur on a regular basis or at random. Fiber wall thicknesses may be substantially uniform or non-uniform. Methods and apparatus for making the fibers are disclosed.
Inventors
- 👤 Christopher H. Porter
- 👤 John A. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:22
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/10; B01D69/00; B01D69/08; D; D01; D01D; D01D5/00; D01D5/24; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/2976
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A semipermeable hollow fiber comprising cuprammonium regenerated cellulose, said fiber having a hollow core extending continuously throughout the length thereof and having a non-uniform wall thickness and a non-uniform cross-sectional area, said fiber having along its length a first plurality of points of maximum outside diameter and a second plurality of points of minimum outside diameter, said maximum outside diameters ranging from about twenty microns to about one thousand microns and said minimum outside diameters ranging from about 0.25 times the maximum outside diameter to about 0.9 times the maximum outside diameter.
Claim 2
Dependent Claim
92 words
A semipermeable hollow fiber comprising cuprammonium regenerated cellulose, said fiber having a hollow core extending continuously throughout the length thereof and having a non-uniform wall thickness and a non-uniform cross-sectional area, said fiber having along its length a first plurality of points of maximum outside diameter and a second plurality of points of minimum outside diameter, said maximum outside diameters ranging from about twenty microns to about one thousand microns and said minimum outside diameters ranging from about 0.25 times the maximum outside diameter to about 0.9 times the maximum outside diameter.
Claim 3
Dependent Claim
28 words
A fiber according to claim 1 wherein said minimum outside diameter ranges from about 0.3 times the maximum outside diameter to about 0.8 times the maximum outside diameter.
Claim 4
Dependent Claim
43 words
A fiber according to claim 1 wherein said maximum outside diameter ranges from about 150 microns to about 300 microns and wherein said minimum outside diameter ranges from about 0.25 times the maximum outside diameter to about 0.9 times the maximum outside diameter.
Claim 5
Dependent Claim
28 words
A fiber according to claim 3 wherein said minimum outside diameter ranges from about 0.3 times the maximum outside diameter to about 0.8 times the maximum outside diameter.
Claim 6
Dependent Claim
39 words
A fiber according to any one of claims 1, 2, 3 and 4 inclusive wherein the total number of points of maximum outside diameter and minimum outside diameter ranges from about two/meter to about four hundred/meter of fiber length.
Claim 7
Dependent Claim
25 words
A fiber according to claim 5 wherein the points of maximum outside diameter and the points of minimum outside diameter have substantially constant repeat distances.
Claim 8
Dependent Claim
18 words
A fiber according to claim 5 wherein the points of maximum and minimum outside diameters occur at random.
Claim 9
Dependent Claim
39 words
A fiber according to any one of claims 1, 2, 3 and 4 inclusive wherein the total number of points of maximum outside diameter and minimum outside diameter ranges from about ten/meter to about one hundred/meter of fiber length.
Claim 10
Dependent Claim
25 words
A fiber according to claim 8 wherein the points of maximum outside diameter and the points of minimum outside diameter have substantially constant repeat distances.
Claim 11
Dependent Claim
18 words
A fiber according to claim 8 wherein the points of maximum and minimum outside diameters occur at random.
Claim 12
Dependent Claim
33 words
A fiber according to any one of claims 1, 2, 3 and 4 inclusive wherein the points of maximum outside diameter and the points of minimum outside diameter have substantially constant repeat distances.
Claim 13
Dependent Claim
26 words
A fiber according to any one of claims 1, 2, 3 and 4 inclusive wherein the points of maximum and minimum outside diameters occur at random.
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |