US4249943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-precious ceramic alloy
Assignee: Williams Gold Refining Co Inc
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Filing: 1978-10-11
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Granted: 1981-02-10
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Expires: 1998-10-11
Abstract
Abstract An alloy composition for dental use containing, by weight, aluminum 0-3.0%, cobalt 0-20.0%, chromium 10.0-20.0%, manganese 0-1.5%, molybdenum 6.0-18.0%, nickel 58.5-77.0% and silicon 0-2.0%. The alloy retains the corrosion resistance properties found in nickel-chromium base alloys while having reduced yield strength typical of gold alloys thereby resulting in greater ease of grinding, polishing and manipulation. The alloy finds use as a porcelain substrate alloy and also as a crown and bridge or partial denture alloy.
Inventors
- 👤 M. Hamdi A. Mohammed
- 👤 Dwarika P. Agarwal
- 👤 Clyde E. Ingersoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:29
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
An alloy for dental use consisting essentially of the following constituents in the indicated percentages by weight: aluminum 1.0-3.0%, cobalt 0-20.0%, chromium 10.0-20.0%, manganese 0.5-1.5%, molybdenum 6.0-18.0%, nickel 58.5-77.0% and silicon 0.5-2.0%, with the proviso that the total of said manganese and said silicon is at least 1.0%, but no more than 3.5%.
Claim 2
Dependent Claim
53 words
An alloy for dental use consisting essentially of the following constituents in the indicated percentages by weight: aluminum 1.0-3.0%, cobalt 0-20.0%, chromium 10.0-20.0%, manganese 0.5-1.5%, molybdenum 6.0-18.0%, nickel 58.5-77.0% and silicon 0.5-2.0%, with the proviso that the total of said manganese and said silicon is at least 1.0%, but no more than 3.5%.
Claim 3
Dependent Claim
34 words
An alloy according to claim 1, consisting essentially of the following constituents in the indicated percentages by weight: aluminum 1.0-2.0%, cobalt 0-10%, chromium 12.0-16.0%, manganese 0.5-1.0%, molybdenum 8.0-16.0%, silicon 0.5-1.0% and the balance nickel.
Claim 4
Dependent Claim
37 words
An alloy according to claim 1, consisting essentially of the following constituents in the indicated percentages by weight: aluminum about 1.0%, chromium about 15.5%, manganese about 0.5%, molybdenum about 14.0%, nickel about 68.5% and silicon about 0.5%.
Claim 5
Dependent Claim
20 words
A cast alloy according to claim 1, provided with at least one layer of porcelain fired on the surface thereof.
Claim 6
Dependent Claim
39 words
An alloy for dental use consisting essentially of the following constituents in the indicated percentages by weight: aluminum about 3.0%, cobalt about 10.0%, chromium about 20.0%, copper about 1.0%, manganese about 1.0%, nickel about 63.5% and silicon about 1.5%.
Claim 7
Dependent Claim
39 words
An alloy for dental use consisting essentially of the following constituents in the indicated percentages by weight: aluminum about 3.0%, cobalt about 10.0%, chromium about 20.0%, copper about 1.0%, manganese about 1.0%, nickel about 63.5% and silicon about 1.5%.
Claim 8
Dependent Claim
20 words
A cast alloy according to claim 5, provided with at least one layer of porcelain fired on the surface thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |