US4965110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatically produced structures and methods of manufacturing
Assignee: University of Liverpool
•
Filing: 1989-06-19
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Granted: 1990-10-23
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Expires: 2009-06-19
Abstract
Abstract A tubular fibrous structure having smaller diameter fibers randomly oriented and larger diameter fibers and/or bundles of fibers circumferentially oriented. The structure includes elongated voids also generally circumferentially oriented.
Inventors
- 👤 John P. Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:03
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/0007; A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10S623/00; Y10S623/924; Y10S623/925; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1369; Y10T428/1372; Y10T428/24; Y10T428/24942; Y10T442/00; Y10T442/60; Y10T442/608
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A tubular fibrous structure comprising small diameter fibers and substantially larger diameter fibers and bundles of fibers, said smaller diameter fibers being randomly oriented in the fibrous structure, said larger diameter fibers and bundles of fibers being circumferentially oriented with respect to the longitudinal axis of said tubular structure, said structure including a plurality of elongated voids with the larger dimension of such voids being generally oriented circumferentially with respect to the longitudinal axis of said tubular structure.
Claim 2
Dependent Claim
78 words
A tubular fibrous structure comprising small diameter fibers and substantially larger diameter fibers and bundles of fibers, said smaller diameter fibers being randomly oriented in the fibrous structure, said larger diameter fibers and bundles of fibers being circumferentially oriented with respect to the longitudinal axis of said tubular structure, said structure including a plurality of elongated voids with the larger dimension of such voids being generally oriented circumferentially with respect to the longitudinal axis of said tubular structure.
Claim 3
Dependent Claim
24 words
A tubular fibrous structure as claimed in claim 1 wherein the larger diameter fibers are embedded in a matrix of said smaller diameter fibers.
Claim 4
Dependent Claim
29 words
A tubular fibrous structure as claimed in claim 1 or claim 2 wherein the smaller diameter fibers have a diameter in the range of 0.5 μmm to 2 μmm.
Claim 5
Dependent Claim
31 words
A tubular fibrous structure as claimed in claim 1 or 2 wherein the larger diameter fibers and bundles of fibers have a diameter in the range of 2μ to 15 μmm.
Claim 6
Dependent Claim
38 words
A tubular fibrous structure as claimed in claim 1 or 2 wherein the ratio of the diameters of the larger diameter fibers and bundles of fibers to the diameters of the smaller diameter fibers is less than 30:1.
Claim 7
Dependent Claim
23 words
A tubular fibrous structure as claimed in claim 1 or 2 including at least one layer of fibers all of said smaller diameter.
Claim 8
Dependent Claim
25 words
A tubular fibrous structure as claimed in claim 6 having a layer of fibers all of said smaller diameter on the inside of the structure.
Claim 9
Dependent Claim
26 words
A tubular fibrous structure as claimed in claim 1 or 2 having a layer of fibers of said smaller diameter on the outside of said structure.
Claim 10
Dependent Claim
26 words
A tubular structure according to claim 1 or 2 wherein the outer surface of the structure is predominantly larger diameter fibers, bundles of fibers and voids.
Claim 11
Dependent Claim
36 words
A tubular structure according to claims 1 or 2 wherein the larger diameter fibers and bundles of fibers form circumferential reinforcing hoops, said hoops being disposed in spaced apart relationship along the length of the graft.
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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) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |