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US4659700A
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Chitosan-glycerol-water gel
Assignee: Ethicon Inc
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Filing: 1984-03-02
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Granted: 1987-04-21
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Expires: 2004-03-02
Abstract
Abstract A chitosan-glycerol-water gel or gel-like membrane, useful as a carrier for medicaments to be applied to wounds, is prepared by dissolving chitosan in an acid-water-glycerol solution, which when neutralized, forms a gel upon standing.
Inventors
- 👤 David S. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:16
CPC Classifications
C; C08; C08L; C08L5/00; C08L5/08; A; A61; A61L; A61L26/00; A61L26/0009; A61L26/0023; A61L26/0061; A61L26/0066; A61L26/008; A61L2300/00; A61L2300/40; A61L2300/402; A61L2300/404; A61L2300/41; A61L2300/412; A61L2300/60; A61L2300/602
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
A gel or gel-like membrane consisting essentially of water, chitosan and glycerol, and having a 3-dimensional gel structure.
Claim 2
Dependent Claim
18 words
A gel or gel-like membrane consisting essentially of water, chitosan and glycerol, and having a 3-dimensional gel structure.
Claim 3
Dependent Claim
36 words
The gel of claim 1, in a clear form and wherein the amount of chitosan present is from 1-4%, the amount of glycerol present is 50-90%, and the pH of the gel is about pH 7.
Claim 4
Dependent Claim
10 words
The gel of claim 2, which also contains a medicament.
Claim 5
Dependent Claim
38 words
The gel-like membrane of claim 1, in a clear form and wherein the amount of chitosan present is from 1-4%, the amount of glycerol present is 10-90%, and the pH of the gel-like membrane is about pH 7.
Claim 6
Dependent Claim
11 words
The gel-like membrane of claim 4, which also contains a medicament.
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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) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |