US4923683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for preventing tooth decay
Assignee: Sangi Co Ltd
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Filing: 1989-09-25
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Granted: 1990-05-08
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Expires: 2009-09-25
Abstract
Abstract A tooth-decay preventing composition containing hydroxy-apatite and a fluoride, wherein at least one of the hydroxy-apatite and/or fluoride is microencapsulated or coated.
Inventors
- 👤 Shuji Sakuma
- 👤 Kiminori Atsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:45
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/02; A61K8/11; A61K8/18; A61K8/19; A61K8/20; A61K8/21; A61K8/24; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
In the art of coating teeth with an effective tooth decay preventing amount of fluoride in a dentifrice containing hydroxy-apatite which serves to absorb dental plaque responsible for tooth decay which simultaneously adheres to the surface of teeth, the improvement wherein the premature reaction of hydroxy-apatite with fluoride which yields apatite fluoride acid calcium fluoride is avoided which consists essentially of the step of breaking or rupturing of coated hydroxy-apatite or microencapsulated hydroxy-apatite at time of use in a hydroxy-apatite containing fluoride dentifrice thereby promoting recalcification and strengthening of teeth.
Claim 2
Dependent Claim
90 words
In the art of coating teeth with an effective tooth decay preventing amount of fluoride in a dentifrice containing hydroxy-apatite which serves to absorb dental plaque responsible for tooth decay which simultaneously adheres to the surface of teeth, the improvement wherein the premature reaction of hydroxy-apatite with fluoride which yields apatite fluoride acid calcium fluoride is avoided which consists essentially of the step of breaking or rupturing of coated hydroxy-apatite or microencapsulated hydroxy-apatite at time of use in a hydroxy-apatite containing fluoride dentifrice thereby promoting recalcification and strengthening of teeth.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein the fluoride is sodium fluoride, sodium monofluorophosphate, or stannous hydroxy-apatite fluoride.
Claim 4
Dependent Claim
41 words
The method according to claim 1, wherein the coating includes a coating material of shellac; waxes; fats; vinylpyridine, alkyl vinylpyridine and polymers/copolymers or other vinyl monomers; ethyl cellulose, benzyl cellulose, cellulose acetobutyrate; polyvinyl acetal diethylaminoacetate and dimethylaminoethyl methacrylate/methyl or methacrylate copolymers.
Claim 5
Dependent Claim
30 words
The method according to claim 1, wherein the coating material for the microencapsulation is a polymer of ethyl cellulose, benzyl cellulose, cellulose acetobutyrate, polyethylene, polyvinyl chloride, rubber, or polyvinyl acetate.
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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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |