US4358271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing ceramic-coated dental prosthetic constructions
Assignee: Heraeus Edelmetalle GmbH
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Filing: 1981-02-11
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Granted: 1982-11-09
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Expires: 2001-02-11
Abstract
Abstract An improved method for preparing a dental prosthetic construction such as a crown or bridge is described by applying a dental ceramic composition to a base of a precious metal silver-containing alloy, drying it and firing the same. In accordance with the improvement, the firing is conducted in a reducing atmosphere.
Inventors
- 👤 Franz Sperner
- 👤 Heidi Brink, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:16
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61C5/00; A61C5/70; A61C5/77; A61K; A61K6/00; A61K6/15; A61K6/16; A61K6/20; A61K6/80; A61K6/802; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
In the method of preparing a dental prosthetic construction, including a crown or bridge, by applying a dental ceramic composition to a precious-metal alloy-containing silver, drying it, and firing the same, the improvement wherein the firing is carried out in a reducing atmosphere comprising carbon monoxide which is produced in the firing chamber of the furnace from atmospheric oxygen and placed in the firing chamber.
Claim 2
Dependent Claim
65 words
In the method of preparing a dental prosthetic construction, including a crown or bridge, by applying a dental ceramic composition to a precious-metal alloy-containing silver, drying it, and firing the same, the improvement wherein the firing is carried out in a reducing atmosphere comprising carbon monoxide which is produced in the firing chamber of the furnace from atmospheric oxygen and placed in the firing chamber.
References Cited (Backward Citations)
US1892490A
Cited
US3052982A
Cited
US3667936A
Cited
US3981723A
Cited
US3928913A
Cited
US4129944A
Cited
US4125442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |