US4224310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dentifrice compositions
Assignee: Richardson Vicks Inc
•
Filing: 1979-09-04
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Granted: 1980-09-23
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Expires: 1999-09-04
Abstract
Abstract Dentifrice composition having strontium disodium ethylenediamine tetraacetate formed in situ.
Inventors
- 👤 Nutan B. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:26
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/30; A61K8/40; A61K8/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
In a dentifrice formulation having incorporated therein strontium disodium ethylenediamine tetraacetate formed in situ the improvement comprising forming the strontium disodium ethylenediamine tetraacetate in situ by the reaction of disodium ethylenediamine tetraacetate with strontium carbonate in water and in the absence of any strontium chloride.
Claim 2
Dependent Claim
45 words
In a dentifrice formulation having incorporated therein strontium disodium ethylenediamine tetraacetate formed in situ the improvement comprising forming the strontium disodium ethylenediamine tetraacetate in situ by the reaction of disodium ethylenediamine tetraacetate with strontium carbonate in water and in the absence of any strontium chloride.
Claim 3
Dependent Claim
23 words
A dentifrice formulation of claim 1 wherein the reaction takes place in the presence of water heated to about 70° to 80° C.
References Cited (Backward Citations)
US3699221A
Cited
US3988434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |