US4603070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven fibrous materials
Assignee: Avecia Ltd
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Filing: 1985-09-19
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Granted: 1986-07-29
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Expires: 2005-09-19
Abstract
Abstract A fibrous non-woven material, comprising a coherent mass of hydrophilic fibres spun from a polymer comprising at least 40 mol % 3-hydroxybutyrate residues, a process therefor, and an article comprising the material with a water-impervious backing e.g. a wound dressing.
Inventors
- 👤 Margaret L. Steel
- 👤 Philip Norton-Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:15
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/005; D04H3/02; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23929; Y10T428/23979; Y10T428/24; Y10T428/24777; Y10T428/24793; Y10T428/24802; Y10T428/24826; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T442/00; Y10T442/60; Y10T442/68
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
19 words
A fibrous non-woven material for medical applications comprising a coherent mass of hydrophilic fibres spun from a hydroxybutyrate polymer.
Claim 2
Dependent Claim
19 words
A fibrous non-woven material for medical applications comprising a coherent mass of hydrophilic fibres spun from a hydroxybutyrate polymer.
Claim 3
Dependent Claim
11 words
A material according to claim 1 wherein the polymer is poly(3-hydroxybutyrate).
Claim 4
Dependent Claim
16 words
A material according to claim 1 or 2 wherein the hydrophilicity is conferred by a surfactant.
Claim 5
Dependent Claim
17 words
A material according to any one of claims 1 to 3 which is a gauze or lint.
Claim 6
Dependent Claim
15 words
A material according to any one of claims 1 to 4 which is highly melded.
Claim 7
Dependent Claim
26 words
A material according to any one of claims 1 to 5 which has been compressed over all or part of its surface including the edges thereof.
Claim 8
Dependent Claim
14 words
A material according to any one of claims 1 to 6 which is sterile.
Claim 9
Dependent Claim
22 words
A process for producing a material according to any one of claims 1 to 7 which comprises centrifugally spinning a hydroxybutyrate polymer.
Claim 10
Dependent Claim
12 words
A process according to claim 8 wherein the spinning is solution spinning.
Claim 11
Dependent Claim
22 words
A process according to claim 9 wherein the solution has the highest possible non-gelling concentration of hydroxybutyrate polymer at the process temperature.
Claim 12
Dependent Claim
12 words
A process according to claim 8 wherein the spinning is melt spinning.
Claim 13
Dependent Claim
18 words
An article comprising a material according to any one of claims 1 to 7 and a water-impermeable backing.
References Cited (Backward Citations)
US3225766A
Cited
US4360488A
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US4385026A
Cited
EP0052459A1
Cited
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Cited
US4534349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |