US4444747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrudable dental cream
Assignee: Colgate Palmolive Co
•
Filing: 1983-03-28
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Granted: 1984-04-24
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Expires: 2003-03-28
Abstract
Abstract A dental cream of desirable rheological properties containing a hydrated alumina polishing material and high viscosity hydroxyethyl cellulose gelling agent.
Inventors
- 👤 Harry Hayes
- 👤 Anthony J. Morton
- 👤 Kenneth Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:03
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/02; A61K8/04; A61K8/042; A61K8/18; A61K8/19; A61K8/26; A61K8/72; A61K8/73; A61K8/731; A61Q; A61Q11/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A dental cream which is smooth and free from extensional rheology during filling and upon extrusion including absence of formation of a tail comprising about 20-75% by weight of a polishing material, at least about half of which is hydrated alumina and about 20-80% by weight based on the weight of the dental cream of a liquid phase containing water, humectant or mixture thereof and about 0.5-5% by weight based on the weight of the dental cream of a gelling agent consisting essentially of hydroxyethyl cellulose having a viscosity in a range the average of which is at least about 24000 cps, determined on a Brookfield viscometer in 2% by weight water:glycerine (1:1.56) solution at 20° C. with a No. 6 spindle at 20 rpm.
Claim 2
Dependent Claim
125 words
A dental cream which is smooth and free from extensional rheology during filling and upon extrusion including absence of formation of a tail comprising about 20-75% by weight of a polishing material, at least about half of which is hydrated alumina and about 20-80% by weight based on the weight of the dental cream of a liquid phase containing water, humectant or mixture thereof and about 0.5-5% by weight based on the weight of the dental cream of a gelling agent consisting essentially of hydroxyethyl cellulose having a viscosity in a range the average of which is at least about 24000 cps, determined on a Brookfield viscometer in 2% by weight water:glycerine (1:1.56) solution at 20° C. with a No. 6 spindle at 20 rpm.
Claim 3
Dependent Claim
17 words
The dental cream claimed in claim 1 wherein about 40-55% of alpha-alumina trihydrate polishing agent is present.
Claim 4
Dependent Claim
25 words
The dental cream claimed in claim 1 wherein said hydroxyethyl cellulose is a grade having a viscosity of about 17,000-31,000; about 37,000-41,000; or about 20,000-30,000.
Claim 5
Dependent Claim
17 words
The dental cream claimed in claim 3 wherein said hydroxyethyl cellulose has a viscosity of about 20,000-30,000.
Claim 6
Dependent Claim
21 words
The dental cream claimed in claim 1 wherein fluorine-providing compound is present in amount which provides about 100-10,000 ppm of fluorine.
Claim 7
Dependent Claim
21 words
The dental cream claimed in claim 5 wherein said fluorine is provided by sodium monofluorophosphate in amount of about 750-2000 ppm.
Claim 8
Dependent Claim
42 words
The dental cream claimed in claim 5 wherein said fluorine about 750-2000 ppm of fluorine is provided by a binary fluoride system of sodium monofluorophosphate and sodium fluoride in which about 30-40% by weight of the fluorine is provided by sodium fluoride.
Claim 9
Dependent Claim
22 words
The dental cream claimed in claim 1 wherein zinc sulphate or aluminium sulphate is present in amount of about 0.05-1.5% by weight.
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |