US4774329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled release agent for cetylpyridinium chloride
Assignee: Cerestar USA Inc
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Filing: 1987-08-04
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Granted: 1988-09-27
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Expires: 2007-08-04
Abstract
Abstract A complex of cyclodextrin and cetylpyridinium chloride is disclosed as a controlled release agent of cetylpyridinium chloride. The cyclodextrin can be either cyclodextrin molecule, a polymer of cyclodextrin or modified cyclodextrin. The method of forming the complex is also disclosed.
Inventors
- 👤 Robert B. Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:25
CPC Classifications
B; B82; B82Y; B82Y5/00; A; A61; A61K; A61K47/00; A61K47/50; A61K47/69; A61K47/6949; A61K47/6951; A61K31/00; A61K31/33; A61K31/395; A61K31/435; A61K31/44; C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0012; C08B37/0015
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
16 words
A controlled release agent for cetylpyridinium chloride comprising a complex formed between cyclodextrin and cetylpyridinium chloride.
Claim 2
Dependent Claim
16 words
A controlled release agent for cetylpyridinium chloride comprising a complex formed between cyclodextrin and cetylpyridinium chloride.
Claim 3
Dependent Claim
14 words
The controlled release agent of claim 1 wherein the cyclodextrin is a beta cyclodextrin.
Claim 4
Dependent Claim
31 words
The controlled release agent of claim 1 wherein the cyclodextrin is produced by reaction of cyclodextrin with a crosslinking agent or by reaction of cyclodextrin with a previously formed polymer backbone.
Claim 5
Dependent Claim
37 words
The controlled release agent of claim 1 wherein the cyclodextrin has been modified in a manner such that the cavity of the cyclodextrin is not too restricted or capped to prevent complex formation with said cetylpyridinium chloride.
Claim 6
Independent Claim
46 words
A method for making a controlled release agent for cetylpyridinium chloride comprising the steps of: (a) mixing cyclodextrin and cetylpyridinium chloride together in water for a sufficient period of time to form a complex; (b) recovering said complex from water; and (c) drying said recovered complex.
Claim 7
Independent Claim
46 words
A method for making a controlled release agent for cetylpyridinium chloride comprising the steps of: (a) mixing cyclodextrin and cetylpyridinium chloride together in water for a sufficient period of time to form a complex; (b) recovering said complex from water; and (c) drying said recovered complex.
Claim 8
Dependent Claim
12 words
The method of claim 5 wherein the cyclodextrin is a beta cyclodextrin.
Claim 9
Dependent Claim
29 words
The method of claim 5 wherein the cyclodextrin is produced by reaction of cyclodextrin with a cross-linking agent or by reaction of cyclodextrin with a previously formed polymer backbone.
Claim 10
Dependent Claim
35 words
The method of claim 5 wherein the cyclodextrin has been modified in a manner such that the cavity of the cyclodextrin is not too restricted or capped to prevent complex formation with said cetylpyridinium chloride.
Claim 11
Dependent Claim
30 words
The method of claim 5 wherein the temperature is about 85° C. during the mixing step and the period of time sufficient to form the complex is about 12 hours.
Claim 12
Dependent Claim
30 words
The method of claim 7 wherein the temperature during the mixing step is about room temperature and the period of time sufficient to form the complex is about 3 hours.
Claim 13
Dependent Claim
31 words
The method of claim 5 wherein the amount of cetylpyridinium chloride and cyclodextrin is in a ratio of about 0.5:1 to about 4:1 of moles of cetylpyridinium chloride:moles of cyclodextrin molecule.
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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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |