Dental cement
Abstract
Abstract 161,868. Schiff, S. June 16, 1920. Addition to 145,052. Metallic-oxide cements; plastic compositions containing oxychlorides; plastic compositions containing soluble silicates. - Colloidal silicic acid, either in the sol condition or as hydrogel, acetogel or alcogel, is added to certain classes of dental cements to increase their hardness and transparency. The cements in question are those composed of zinc oxide and a solution of zinc chloride or sulphate or a phosphate, and those containing silicates or polysilicates with oxides, phosphates, borates, &c., of various metals and a solution of phosphoric acid. Ths colloidal silicic acid may be added either to the solution or to the solid ingredient of the cement, or to both, or it may be used alone with metallic oxides.
Inventors
- 👤 Schiff Sally
Bibliographic Details
Claims Analysis
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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) | 1925-03-06 | 1925-09-05 | 1926-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-03-06 | 1929-09-05 | 1930-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-03-06 | 1933-09-05 | 1934-03-07 | $7700.00 | Window Closed / Lapsed |