US5017363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized stannous fluoride toothpaste
Assignee: Gillette Canada Inc
•
Filing: 1990-07-25
•
Granted: 1991-05-21
•
Expires: 2010-07-25
Abstract
Abstract Stannous fluoride containing toothpaste compositions including an alkyl vinyl ether and maleic anhydride or acid copolymer as a stabilizing agent for stannous fluoride and methods for preparing such stabilized compositions.
Inventors
- 👤 Christopher H. Suhonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:39
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/20; A61K8/21; A61K8/72; A61K8/81; A61K8/8164
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
An aqueous toothpaste composition consisting essentially of water-unstable stannous fluoride and a lower alkyl vinyl ether and maleic anhydride copolymer as the essential stannous ion chelate forming stabilizer in an amount sufficient to effectively stabilize the stannous fluoride concentration against stannous oxide precipitation by providing oxidation protection to the stannous ion, the composition being substantially free from soluble pyrophosphates, silica containing compounds, and aldehyde group containing compounds.
Claim 2
Dependent Claim
67 words
An aqueous toothpaste composition consisting essentially of water-unstable stannous fluoride and a lower alkyl vinyl ether and maleic anhydride copolymer as the essential stannous ion chelate forming stabilizer in an amount sufficient to effectively stabilize the stannous fluoride concentration against stannous oxide precipitation by providing oxidation protection to the stannous ion, the composition being substantially free from soluble pyrophosphates, silica containing compounds, and aldehyde group containing compounds.
Claim 3
Dependent Claim
15 words
A composition of claim 1 where the lower alkyl vinyl ether is methyl vinyl ether.
Claim 4
Dependent Claim
59 words
A composition of claim 1 where the amount of stannous fluoride included in the composition provides between about 0.05 to about 5.0 percent by weight stannous fluoride, the copolymer being present in an amount between about 0.5 to about 5.0 percent by weight, the weight ratio of stannous fluoride to copolymer being from between about 0.01 to about 1.0.
Claim 5
Dependent Claim
11 words
A composition of claim 1 where the composition includes an abrasive.
Claim 6
Dependent Claim
12 words
A composition of claim 4 where the abrasive is a calcium pyrophosphate.
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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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |