US4933171A
Expired / Lapsed
US
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Oral compositions
Assignee: Unilever Patent Holdings BV
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Filing: 1989-05-19
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Granted: 1990-06-12
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Expires: 2009-05-19
Abstract
Abstract The present invention relates to oral compositions for treating sensitive teeth. These compositions comprise an agent for desensitizing sensitive teeth, such as potassium nitrate of strontium acetate, and a particulate abrasive material which is hydroxyapatite. The hydroxyapatite is compatible with the desensitizing agent.
Inventors
- 👤 Neil J. Bristow
- 👤 Peter Carter
- 👤 Bryony E. Coulson
- 👤 Michael A. Trevethan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:35
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24; A61Q; A61Q11/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
An oral composition for the treatment of sensitive teeth, comprising a source of potassium and/or strontium ions as desensitising agent, and a particulate abrasive material, wherein the particulate abrasive material is or comprises hydroxyapatite.
Claim 2
Dependent Claim
34 words
An oral composition for the treatment of sensitive teeth, comprising a source of potassium and/or strontium ions as desensitising agent, and a particulate abrasive material, wherein the particulate abrasive material is or comprises hydroxyapatite.
Claim 3
Dependent Claim
20 words
A preparation according to claim 1, wherein the hydroxyapatite has an average particle size of from 1 to 15 microns.
Claim 4
Dependent Claim
31 words
A preparation according to claim 1, wherein the hydroxyapatite is a synthetic hydroxyapatite which consists for at least 92% by weight of Ca 10 (PO 4 ) 6 (OH) 2 .
Claim 5
Dependent Claim
18 words
A preparation according to claim 1, wherein the hydroxyapatite is present in an amount of 1-50% by weight.
Claim 6
Dependent Claim
26 words
A composition according to claim 1, wherein the composition comprises from 1-10% by weight of the source of the potassium and/or strontium ions as desensitising agent.
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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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |