US4168301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dentifrice based on high particle size alpha-alumina trihydrate
Assignee: Lever Brothers Co
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Filing: 1974-07-19
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Granted: 1979-09-18
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Expires: 1994-07-19
Abstract
Abstract The invention relates to a dentifrice which contains at least 40% by weight of abrasive agent of which at least 30% by weight of the dentifrice is alpha-alumina trihydrate having a particle size such that at least about 20%, and preferably at least about 25%, by weight of the particles have a size greater than 20 microns. The dentifrice when in the form of a toothpaste preferably contains as sole abrasive agent 45% to 60% by weight of particles of alpha-alumina trihydrate of gaussian distribution and weight median diameter of about 14 to about 25 microns.
Inventors
- 👤 Brinley R. Pugh
- 👤 Charles A. Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:35
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/26; A61Q; A61Q11/00; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
A dentifrice containing a total content of abrasive agent of at least 40% by weight, the abrasive agent comprising an amount of at least 30% by weight of the dentifrice of alpha-alumina trihydrate having a particle size distribution such that at least about 20% by weight of the particles have a size greater than 20 microns.
Claim 2
Dependent Claim
56 words
A dentifrice containing a total content of abrasive agent of at least 40% by weight, the abrasive agent comprising an amount of at least 30% by weight of the dentifrice of alpha-alumina trihydrate having a particle size distribution such that at least about 20% by weight of the particles have a size greater than 20 microns.
Claim 3
Dependent Claim
28 words
A dentifrice as claimed in claim 1, wherein at least about 25% by weight of the particles of the alpha-alumina trihydrate have a size greater than 20 microns.
Claim 4
Dependent Claim
32 words
A dentifrice as claimed in claim 1, wherein the particles of the alpha-alumina trihydrate have a normal gaussian distribution and have a weight median diameter of about 14 to about 25 microns.
Claim 5
Dependent Claim
26 words
A dentifrice as claimed in claim 3, wherein the particles of the alpha-alumina trihydrate have a weight median diameter of about 16 to about 23 microns.
Claim 6
Dependent Claim
64 words
A dentifrice as claimed in claim 2, wherein at least 50% by weight of the particles of the alpha-alumina trihydrate have a size greater than 10 microns; 25% to 60% by weight have a size greater than 20 microns; 5% to 30% by weight have a size greater than 30 microns; and up to 15% by weight have a size greater than 40 microns.
Claim 7
Dependent Claim
52 words
A dentifrice as claimed in claim 5, wherein at least 70% by weight of the particles of the alpha-alumina trihydrate have a size greater than 10 microns; 30% to 50% by weight have a size greater than 20 microns; and 10% to 30% by weight have a size greater than 30 microns.
Claim 8
Dependent Claim
45 words
A dentifrice as claimed in claim 1, containing at least 40% by weight of abrasive agents consisting substantially entirely of alpha-alumina trihydrate having a particle size distribution such that at least about 20% by weight of the particles have a size greater than 20 microns.
Claim 9
Dependent Claim
34 words
A dentifrice as claimed in claim 7, wherein the alpha-alumina trihydrate is present in an amount of 45% to 60% by weight of the dentifrice, the dentifrice being in the form of a toothpaste.
Claim 10
Dependent Claim
19 words
A dentifrice as claimed in claim 1, wherein the alpha-alumina trihydrate is the sole abrasive agent of the dentifrice.
Claim 11
Dependent Claim
47 words
A dentifrice as claimed in claim 1 in the form of a toothpaste and containing as sole abrasive agent 45% to 60% by weight of an alpha-alumina trihydrate having a gaussian particle size distribution and having a weight median diameter of about 16 to about 23 microns.
Claim 12
Dependent Claim
93 words
A dentifrice as claimed in claim 1 containing a total content of abrasive of at least 40% by weight, the abrasive agent comprising (a) an amount of at least 30% by weight of the dentifrice is alpha-alumina trihydrate having a particle size distribution such that at least about 20% by weight of the particles have a size greater than 20 microns, and (b) not more than 10% by weight of a supplementary abrasive being selected from the group of abrasives precipitated silica, aragonitic chalk, calcitic chalk, insoluble sodium metaphosphate and dicalcium phosphate dihydrate.
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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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |