US4094671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gold color copper alloy for restorative dentistry
Assignee: Individual
•
Filing: 1976-07-12
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Granted: 1978-06-13
•
Expires: 1996-07-12
Abstract
Abstract A copper alloy having a gold color and being particularly suitable for restorative dentistry and consisting essentially of copper, zinc and a small amount of zirconium. Other additions may be included in the alloy.
Inventors
- 👤 Osamu Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:47
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A gold color dental restoration formed of a copper alloy consisting essentially by weight of 48-52% of copper, 47-51% of zinc and 0.1-1.0% of zirconium, said dental restoration being chemically stable against discoloration and dissolution in the mouth in which it is applied.
Claim 2
Dependent Claim
43 words
A gold color dental restoration formed of a copper alloy consisting essentially by weight of 48-52% of copper, 47-51% of zinc and 0.1-1.0% of zirconium, said dental restoration being chemically stable against discoloration and dissolution in the mouth in which it is applied.
Claim 3
Dependent Claim
21 words
The gold color dental restoration according to claim 1 and also containing nickel in an amount less than 1.2% by weight.
Claim 4
Dependent Claim
33 words
The gold color dental restoration according to claim 1 and also containing nickel in an amount of less than 1.2% by weight and indium in an amount of less than 1.0% by weight.
Claim 5
Dependent Claim
43 words
The gold color dental restoration according to claim 1 and also containing nickel in an amount of less than 1.2% by weight, indium in an amount of less than 1.0% by weight and silicon in an amount of less than 1.0% by weight.
Claim 6
Dependent Claim
52 words
The gold color dental restoration according to claim 1 and also containing nickel in an amount of less than 1.2% by weight, indium in an amount ofless than 1.0% by weight, silicon in an amount of less than 1.0% by weight and beryllium in an amount of less than 0.5% by weight.
Claim 7
Dependent Claim
53 words
The gold color dental restoration according to claim 1 and also containing nickel in an amount of less than 1.2% by weight, indium in an amount of less than 1.0% by weight, silicon in an amount of less than 1.0% by weight and lithium in an amount of less than 0.5% by weight.
Claim 8
Dependent Claim
22 words
The gold color dental restoration according to claim 5 and also containing lithium in an amount of less than 0.5% by weight.
References Cited (Backward Citations)
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US2035423A
Cited
US2235634A
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US2296706A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |