Patent US1316729A successfully refreshed from Google Patents.
US5482932A
Expired / Lapsed
US
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Alginate gels to the form of fibrous pastes useful as wound dressings
Assignee: ACORDIS SERVICES Ltd
•
Filing: 1993-09-07
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Granted: 1996-01-09
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Expires: 2013-09-07
Abstract
Abstract The invention provides alginate gels which have the form of a fibrous paste and which particularly have an alginate content (expressed as alginic acid) in the range 2 to 11 percent by weight. The gels may be prepared by treating a water-insoluble or water-swellable alginate fiber, for example calcium alginate fiber, with an aqueous solution of a solubilizing salt, for example sodium chloride. The new gels are easier to handle than known alginate gels and are useful in wound dressing applications.
Inventors
- 👤 Joseph Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:13
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0084; A; A61; A61L; A61L26/00; A61L26/0009; A61L26/0023
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
An alginate gel in the form of a moldable water-soluble fibrous paste, having an alginate content expressed as alginic acid in the range of 2 to 11 percent by weight, said alginate containing mannuronic and guluronic acid units in a mannuronic acid:guluronic acid ratio in the range of about 55:45 to about 75:25, said paste produced by the process comprising treating water insoluble or water swellable alginate fiber with an aqueous solution of a solubilizing salt.
Claim 2
Dependent Claim
76 words
An alginate gel in the form of a moldable water-soluble fibrous paste, having an alginate content expressed as alginic acid in the range of 2 to 11 percent by weight, said alginate containing mannuronic and guluronic acid units in a mannuronic acid:guluronic acid ratio in the range of about 55:45 to about 75:25, said paste produced by the process comprising treating water insoluble or water swellable alginate fiber with an aqueous solution of a solubilizing salt.
Claim 3
Dependent Claim
21 words
An alginate gel according to claim 1, wherein said alginate content is in the range 3 to 7 percent by weight.
Claim 4
Dependent Claim
23 words
An alginate gel according to claim 1, which contains sodium ions in an amount in the range 0.6 to 1.4 percent by weight.
Claim 5
Dependent Claim
23 words
An alginate gel according to claim 1, which contains sodium ions in an amount in the range 0.65 to 0.75 percent by weight.
Claim 6
Dependent Claim
23 words
An alginate gel according to claim 1, which contains calcium ions in an amount in the range 0.05 to 0.60 percent by weight.
Claim 7
Dependent Claim
23 words
An alginate gel according to claim 1, which contains calcium ions in an amount in the range 0.10 to 0.45 percent by weight.
Claim 8
Dependent Claim
25 words
An alginate gel according to claim 1, which has a solids content (determined by oven drying) in the range 3 to 10 percent by weight.
Claim 9
Dependent Claim
25 words
An alginate gel according to claim 1, which has a solids content (determined by oven drying) in the range 3.5 to 8.0 percent by weight.
Claim 10
Dependent Claim
25 words
The alginate gel according to claim 1 wherein the alginate fiber is provided for treatment in the form of a loose assembly of staple fiber.
Claim 11
Dependent Claim
15 words
The alginate gel according to claim 1 wherein the alginate fiber is calcium alginate fiber.
Claim 12
Dependent Claim
14 words
The alginate gel according to claim 1, wherein the solubilizing salt is sodium chloride.
Claim 13
Dependent Claim
20 words
The alginate gel according to claim 1, wherein the aqueous solution of a solubilizing salt is physiological or isotonic saline.
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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) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |