Patent US4957908A successfully refreshed from Google Patents.
US4957908A
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US
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Chitosan pyrithione as antimicrobial agent useful in personal care products
Assignee: Arch Chemicals Inc
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Filing: 1990-01-08
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Granted: 1990-09-18
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Expires: 2010-01-08
Abstract
Abstract In accordance with the present invention, a new pyrithione salt, namely chitosan pytighione, is produced. This composition is characterized by a combination of slow release from films and excellent antimicrobial activity. The antimicrobial activity is equivalent to that of sodium pyrithione. These properties make chitosan pyrithione potentially useful as an antimicrobial agent in a variety of dermatological items, such as soaps, shampoos, and skin care medicaments.
Inventors
- 👤 John D. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:55
CPC Classifications
A; A61; A61Q; A61Q17/00; A61Q17/005; A01; A01N; A01N43/00; A01N43/02; A01N43/04; A01N43/06; A01N43/10; A01N43/34; A01N43/40; A61K; A61K47/00; A61K47/50; A61K47/51; A61K47/56; A61K47/61; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/4906; A61K8/4933; A61K8/72; A61K8/73; A61K8/736; A61Q19/00; A61Q5/00; A61Q5/02; C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
29 words
A personal care product comprising an antimicrobial effective amount of chitosan pyrithione and at least one component selected from the group consisting of soaps, shampoos, skin-care medicaments and cosmetics.
Claim 2
Dependent Claim
29 words
A personal care product comprising an antimicrobial effective amount of chitosan pyrithione and at least one component selected from the group consisting of soaps, shampoos, skin-care medicaments and cosmetics.
Claim 3
Dependent Claim
31 words
The product of claim 1 wherein said chitosan pyrithione is present in an amount of between about 0.1 and about 30 weight percent based upon the total weight of said product.
Claim 4
Dependent Claim
18 words
A process for producing chitosan pyrithione which comprises reacting chitosan acetate with sodium Pyrithione in an aqueous medium.
Claim 5
Dependent Claim
18 words
A process for producing chitosan pyrithione which comprises reacting chitosan acetate with sodium Pyrithione in an aqueous medium.
Claim 6
Dependent Claim
20 words
The process of claim 3 wherein said chitosan pyrithione has a molecular weight of between about 150,000 and about 500,000.
Claim 7
Dependent Claim
18 words
A process for producing chitosan pyrithione by a neutralization reaction which comprises reacting pyrithione acid with chitosan base.
Claim 8
Dependent Claim
18 words
A process for producing chitosan pyrithione by a neutralization reaction which comprises reacting pyrithione acid with chitosan base.
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |