US4229215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-precious stainless dental alloy
Assignee: NEOLOY/DENTEX Inc
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Filing: 1979-06-22
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Granted: 1980-10-21
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Expires: 1999-06-22
Abstract
Abstract The present invention provides a non-precious 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 2550° F. In its broadest aspect the alloy consists of cobalt 49 to 59%, chromium 25 to 30%, tungsten 7 to 14%, gallium 2 to 6%, copper 1 to 3%, niobium 0.5 to 2%, silicon 0.5 to 2%, and iron 0.5 to 6%.
Inventors
- 👤 Emil M. Prosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:27
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A stainless dental alloy especially adapted for the adhesion of opaqueing porcelain having a fusing temperature of approximately 1800° F., consisting essentially of: ______________________________________
Cobalt 49 to 59%
Chromium 25 to 30%
Tungsten 7 to 14%
Gallium 2 to 6%
Copper 1 to 3%
Niobium 0.5 to 2%
Silicon 0.5 to 2%
Iron 0.5 to 6%
______________________________________ said alloy having a melting temperature of approximately 2550° F., and a linear coefficient of expansion of about 1.4×10 -5 per °C.
Claim 2
Dependent Claim
79 words
A stainless dental alloy especially adapted for the adhesion of opaqueing porcelain having a fusing temperature of approximately 1800° F., consisting essentially of: ______________________________________
Cobalt 49 to 59%
Chromium 25 to 30%
Tungsten 7 to 14%
Gallium 2 to 6%
Copper 1 to 3%
Niobium 0.5 to 2%
Silicon 0.5 to 2%
Iron 0.5 to 6%
______________________________________ said alloy having a melting temperature of approximately 2550° F., and a linear coefficient of expansion of about 1.4×10 -5 per °C.
Claim 3
Dependent Claim
32 words
A stainless 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 2550° F.
Claim 4
Dependent Claim
25 words
A stainless dental alloy consisting essentially of: ______________________________________
Cobalt 52%
Chromium 28%
Tungsten 12%
Gallium 4%
Copper 1%
Niobium 1%
Silicon 0.5%
Iron 1.5%
______________________________________
Claim 5
Dependent Claim
25 words
A stainless dental alloy consisting essentially of: ______________________________________
Cobalt 52%
Chromium 28%
Tungsten 12%
Gallium 4%
Copper 1%
Niobium 1%
Silicon 0.5%
Iron 1.5%
______________________________________
Claim 6
Dependent Claim
46 words
A stainless 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 2550° F. and a linear coefficient of expansion of approximately 1.4×10 -5 per °C.
References Cited (Backward Citations)
US3134670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |