US4263045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless dental alloy for application of low-fusing opaqueing porcelain
Assignee: NEOLOY/DENTEX Inc
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Filing: 1979-08-30
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Granted: 1981-04-21
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Expires: 1999-08-30
Abstract
Abstract The present invention provides a stainless dental alloy which may be used in producing crowns, bridges, inlays, and the like. It also provides an alloy which is especially adapted for the application of low-fusing opaqueing porcelain for adhesion to such dental appliances. The alloy of the present invention has a melting point approximating 2650° F. In its broadest aspect the alloy consists of cobalt 40 to 60%, chromium 18 to 35%, tungsten 5 to 20%, molybdenum 1 to 4%, copper 0.5 to 2%, iron 1 to 3%, manganese 0.5 to 2%, niobium 0.5 to 2%, and silicon 0.25 to 1%.
Inventors
- 👤 Emil M. Prosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:39
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; C22C30/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A dental alloy especially adapted for the adhesion of opaqueing porcelain having a fusing temperature of approximately 1800° F., consisting essentially of: Cobalt 40 to 60% Chromium 18 to 35% Tungsten 5 to 20% Molybdenum 1 to 4% Copper 0.5 to 2% Iron 1 to 3% Manganese 0.5 to 2% Niobium 0.5 to 2% Silicon 0.25 to 1% said alloy having a melting temperature of approximately 2650° F., and a linear coefficient of expansion of about 1.4×10 -5 per °C.
Claim 2
Dependent Claim
80 words
A dental alloy especially adapted for the adhesion of opaqueing porcelain having a fusing temperature of approximately 1800° F., consisting essentially of: Cobalt 40 to 60% Chromium 18 to 35% Tungsten 5 to 20% Molybdenum 1 to 4% Copper 0.5 to 2% Iron 1 to 3% Manganese 0.5 to 2% Niobium 0.5 to 2% Silicon 0.25 to 1% said alloy having a melting temperature of approximately 2650° F., and a linear coefficient of expansion of about 1.4×10 -5 per °C.
Claim 3
Dependent Claim
31 words
A dental alloy according to claim 1, wherein the percentages of cobalt, chromium and tungsten are varied within the limits set forth to produce the melting temperature of approximately 2650° F.
Claim 4
Dependent Claim
24 words
A dental alloy consisting essentially of: Cobalt 56% Chromium 28% Tungsten 10% Molybdenum 2% Copper 1% Iron 1% Manganese 0.80% Niobium 0.70% Silicon 0.50%
Claim 5
Dependent Claim
24 words
A dental alloy consisting essentially of: Cobalt 56% Chromium 28% Tungsten 10% Molybdenum 2% Copper 1% Iron 1% Manganese 0.80% Niobium 0.70% Silicon 0.50%
Claim 6
Dependent Claim
45 words
A dental alloy according to claim 3, especially adapted for adhesion to opaqueing porcelain having a fusing temperature of approximately 1800° F., said dental alloy having a melting temperature of approximately 2650° F. and a linear coefficient of expansion of approximately 1.4×10 -5 per °C.
References Cited (Backward Citations)
US2570355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |