US4267164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Effervescent stannous fluoride tablet
Assignee: Block Drug Co Inc
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Filing: 1980-01-31
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Granted: 1981-05-12
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Expires: 2000-01-31
Abstract
Abstract An effervescent tablet is produced by preparing a powdered tabletable composition containing stannous fluoride and malic acid and an alkali metal bicarbonate in a weight ratio of about 3:2 as the effervescent couple.
Inventors
- 👤 Kuo-Chen Yeh
- 👤 Frank Mazzella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:58
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/20; A61K8/21; A61K8/30; A61K8/33; A61K8/36; A61K8/365; A61K9/00; A61K9/0002; A61K9/0007; A61K2800/00; A61K2800/20; A61K2800/22; A61K2800/222
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
31 words
An effervescent stannous fluoride containing dental tablet comprising stannous fluoride and an effervescent couple consisting essentially of malic acid and an alkali metal bicarbonate in a weight ratio of about 3:2.
Claim 2
Dependent Claim
31 words
An effervescent stannous fluoride containing dental tablet comprising stannous fluoride and an effervescent couple consisting essentially of malic acid and an alkali metal bicarbonate in a weight ratio of about 3:2.
Claim 3
Dependent Claim
33 words
The effervescent tablet of claim 1 wherein said stannous fluoride comprises about 1-10% of said tablet, said effervescent couple is about 60-72% of said tablet and said alkali metal bicarbonate comprises sodium bicarbonate.
Claim 4
Dependent Claim
16 words
The effervescent tablet of claim 2 containing about 10-15 weight percent sorbitol as a tableting aid.
Claim 5
Dependent Claim
26 words
The effervescent tablet of claim 3 containing a lubricant comprising a solid polyethylene glycol of at least 6000 molecular weight and a siloxane polymer coated benzoate.
Claim 6
Dependent Claim
50 words
The effervescent tablet of claim 4 wherein said polyethylene glycol has a molecular weight of 6000 and is about 2-10% of the weight of the tablet and said siloxane polymer coated benzoate is about 2-8 weight percent simethicone coated sodium benzoate in which the simethicone is about 1-4 weight percent.
Claim 7
Dependent Claim
24 words
The effervescent tablet of claim 5 having a dissolution time of about 30-90 seconds in water, and a hardness of less than 5-6 SCHU.
Claim 8
Dependent Claim
23 words
The effervescent tablet of claim 6 in the form of an about 480-500 milligram slightly concave tablet of about 11.1 millimeters in diameter.
Claim 9
Dependent Claim
66 words
The effervescent tablet of claim 7 wherein the amount of said malic acid-bicarbonate effervescent couple is about 60-72%, the amount of the stannous fluoride is about 2-9%, the amount of the polyethylene glycol is about 3-5%, the amount of the simethicone on the sodium benzoate is about 2-4% and the amount of the simethicone coated sodium benzoate is about 3-6% percent, the sorbitol is about 10-20%.
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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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |