US3841860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental alloy
Assignee: Dentsply Research and Development Corp
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Filing: 1973-07-11
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Granted: 1974-10-15
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Expires: 1993-07-11
Abstract
Abstract A novel dental restorative is described which achieves improved physical properties by employing a combination of amalgamatable silver-copper-tin dental alloys in the trituration with a minimum of mercury where one of the silver-containing alloys contains between 15 percent and 30 percent copper by weight of the single alloy component.
Inventors
- 👤 D Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:52
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/06; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A DENTAL COMPOSITION AMALGAMATEABLE BY TRITURATION WITH MERCURY COMPRISING A MIXTURE OF AMALGAMATABLE SILVERABOUT 60 AND 80 PERCENT BY WEIGHT OF THE ALLOY WEIGHT OF CONTAINING ALLOYS WHEREIN ONE OF THE ALLOYS CONTAINS BETWEEN SILVER, BETWEEN ABOUT 15 AND 30 PERCENT BY WEIGHT COPPER AND BETWEEN ABOUT 2 AND 15 PERCENT BY WEIGHT TIN AND A SECOND ALLOY COMPRISES BETWEEN 68 AND 72 PERCENT BY WEIGHT OF THE ALLOY OF SILVER, BETWEEN ABOUT 22 AND 28 PERCENT BY WEIGHT OF TIN AND BETWEEN ABOUT 1 AND 8 PERCENT BY WEIGHT OF COPPE
Claim 2
Dependent Claim
92 words
A DENTAL COMPOSITION AMALGAMATEABLE BY TRITURATION WITH MERCURY COMPRISING A MIXTURE OF AMALGAMATABLE SILVERABOUT 60 AND 80 PERCENT BY WEIGHT OF THE ALLOY WEIGHT OF CONTAINING ALLOYS WHEREIN ONE OF THE ALLOYS CONTAINS BETWEEN SILVER, BETWEEN ABOUT 15 AND 30 PERCENT BY WEIGHT COPPER AND BETWEEN ABOUT 2 AND 15 PERCENT BY WEIGHT TIN AND A SECOND ALLOY COMPRISES BETWEEN 68 AND 72 PERCENT BY WEIGHT OF THE ALLOY OF SILVER, BETWEEN ABOUT 22 AND 28 PERCENT BY WEIGHT OF TIN AND BETWEEN ABOUT 1 AND 8 PERCENT BY WEIGHT OF COPPE
References Cited (Backward Citations)
US3305356A
Cited
US3532521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |