Patent US5256402A successfully refreshed from Google Patents.
US5256402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive tooth whitening dentifrice of improved stability
Assignee: Colgate Palmolive Co
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Filing: 1991-09-13
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Granted: 1993-10-26
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Expires: 2011-09-13
Abstract
Abstract Abrasive dentifrice compositions containing an oxygen liberating whitening compound which is stable with respect to oxygen level and exhibits heightened and rapid whitening of teeth and stain removal which comprises a combination of a dicalcium phosphate compound and a metal ion free peroxide compound.
Inventors
- 👤 Michael Prencipe
- 👤 Vincent Drago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:27
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24; A61K8/22; A61Q; A61Q11/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
An aqueous abrasive toothpaste composition containing a peroxide compound which is stable with respect to active oxygen level and exhibits heightened and rapid whitening of teeth and stain removal which aqueous composition consists essentially of a mixture, stable and storable without a peroxide stabilizer, when filled into a closed container of at least 7% by weight water, and a combination of about 20 to about 60% by weight calcium pyrophosphate, at least about 1 to about 20% by weight of urea peroxide and about 0.5 to about 8.0% by weight of an alkali pyrophosphate salt, which combination is stable and effective to remove stain and whiten teeth in the oral cavity.
Claim 2
Dependent Claim
111 words
An aqueous abrasive toothpaste composition containing a peroxide compound which is stable with respect to active oxygen level and exhibits heightened and rapid whitening of teeth and stain removal which aqueous composition consists essentially of a mixture, stable and storable without a peroxide stabilizer, when filled into a closed container of at least 7% by weight water, and a combination of about 20 to about 60% by weight calcium pyrophosphate, at least about 1 to about 20% by weight of urea peroxide and about 0.5 to about 8.0% by weight of an alkali pyrophosphate salt, which combination is stable and effective to remove stain and whiten teeth in the oral cavity.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the composition also contains a humectant, surfactant and thickener.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein thc humectant is a polyethylene glycol having a molecular weight between about 200 to about 20,000.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein the humectant is glycerine, sorbitol, xylitol, propylene glycol, or a mixture thereof.
Claim 6
Dependent Claim
29 words
The composition of claim 1 wherein the surfactant is a nonionic water soluble polyoxyethylene monoester of sorbitol with a C 10-18 fatty acid ester of sorbitol and sorbitol anhydrides.
Claim 7
Dependent Claim
14 words
The composition of claim 1 wherein the thickening agent is polyoxyethylene polyoxypropylene block copolymer.
Claim 8
Dependent Claim
11 words
The composition of claim 1 wherein the thickener is carboxymethyl cellulose.
Claim 9
Dependent Claim
13 words
The composition of claim 1 wherein the thickening agent is fumed colloidal silica.
Claim 10
Dependent Claim
30 words
The composition of claim 1 wherein an agent which diminishes teeth sensitivity selected from the group consisting of strontium chloride, potassium nitrate and potassium citrate is incorporated in the composition.
Claim 11
Dependent Claim
21 words
The composition of claim 1 wherein the pH of the composition is in the range of about 5.0 to about 7.5.
Claim 12
Dependent Claim
17 words
The composition of claim 1 wherein the alkali pyrophosphate salt is a dialkali or tetraalkali pyrophosphate salt.
Claim 13
Dependent Claim
28 words
The composition of claim 11 wherein the dialkali or tetraalkali pyrophosphate salt is Na 4 P 2 O 7 or Na 2 H 2 P 2 O 7
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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) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |