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Patent US3705940A successfully refreshed from Google Patents.
US3705940A
Expired / Lapsed
US
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Silicic acid-containing dentifrice
Assignee: Evonik Operations GmbH
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Filing: 1969-02-07
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Granted: 1972-12-12
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Expires: 1989-02-07
Abstract
Abstract A DENTIFRICE COMPRISES A SUSPENSION IN WATER, GLYCERINE OR A COMBINATION OF BOTH OF (A) A HYDROPHOBIC SILICIC ACID OBTAINED BY A PYROGENIC PROCESS AND (B) PARAFFIN OIL OR A VEGETABLE OIL OR VEGETABLE FAT OR MIXTURE OF THESE OILS AND FATS. THE DENTIFRICE MAY ALSO INCLUDE FINELY DISPERSED HYDROPHILIC SILICIC ACID OR PRECIPITATED SILICIC ACID AS A THICKENER AND POLISH.
Inventors
- 👤 Hedwig Kirchgassner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:11
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/25; A61Q; A61Q11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |