Patent US4822599A successfully refreshed from Google Patents.
US4822599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oral compositions
Assignee: Procter and Gamble Co
•
Filing: 1987-08-26
•
Granted: 1989-04-18
•
Expires: 2007-08-26
Abstract
Abstract Methods which reduce natural stain from teeth are described.
Inventors
- 👤 Sekhar Mitra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/20; A61K8/21; A61K8/24; A61K8/25; A61K8/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A method for reducing natural stain on teeth comprising brushing the teeth with a toothpaste comprising: (a) from about 10% to about 70% by weight of a dental abrasive compatible with pyrophosphate ions and fluoride ions; (b) an amount of a fluoride ion source sufficient to supply from about 50 ppm to about 3,500 ppm of fluoride ions; (c) an amount of at least one soluble pyrophosphate source sufficient to provide at least about 1.0% (P 2 O 7 ) -4 ; and (d) from about 10% to about 95% water; wherein the pH of said composition is from about 6.0 to about 10.0.
Claim 2
Independent Claim
104 words
A method for reducing natural stain on teeth comprising brushing the teeth with a toothpaste comprising: (a) from about 10% to about 70% by weight of a dental abrasive compatible with pyrophosphate ions and fluoride ions; (b) an amount of a fluoride ion source sufficient to supply from about 50 ppm to about 3,500 ppm of fluoride ions; (c) an amount of at least one soluble pyrophosphate source sufficient to provide at least about 1.0% (P 2 O 7 ) -4 ; and (d) from about 10% to about 95% water; wherein the pH of said composition is from about 6.0 to about 10.0.
Claim 3
Dependent Claim
28 words
A method according to claim 1 wherein the soluble pyrophosphate salt is selected from the group consisting of tetraalkali metal pyrophosphate salts, dialkalimetal pyrophosphate salts and mixtures thereof.
Claim 4
Dependent Claim
26 words
A method according to claim 2 wherein the abrasive is selected from the group consisting of β-phase calcium pyrophosphate, alumina, insoluble metaphosphate, silica and mixtures thereof.
Claim 5
Dependent Claim
14 words
A method according to claim 3 wherein the fluoride ion source is sodium fluoride.
Claim 6
Dependent Claim
27 words
A method according to claim 4 wherein the pyrophosphate ion source is selected from the group consisting of tetrasodium pyrophosphate tetrapotassium pyrophosphate, disodium pyrophosphate and mixtures thereof.
Claim 7
Dependent Claim
13 words
A method according to claim 5 wherein the abrasive is a silica abrasive.
Claim 8
Dependent Claim
16 words
A method according to claim 1 wherein the composition also contains a humectant and a binder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |