US4008080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper free dental gold alloys
Assignee: Evonik Operations GmbH
•
Filing: 1975-11-04
•
Granted: 1977-02-15
•
Expires: 1995-11-04
Abstract
Abstract There is provided a copper free dental gold alloy that contains 25 to 40% silver, 40 to 60% gold, 5 to 20% palladium, 0.05 to 0.5% iridium, 0 to 6% indium, 0 to 6% tin and 0 to 2% zinc with the proviso that at least 2% of the named non-noble metals are present, all percents are weight percents.
Inventors
- 👤 Ewald Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A copper free dental gold alloy consisting essentially of 25 to 40% silver, 40 to 60% gold, 5 to 20% palladium, 0.05 to 0.5% iridium, 0 to 6% indium 0 to 6% tin and 0 to 2% zinc, with the proviso that the named non-noble metals are present in a total amount of at least 2%.
Claim 2
Dependent Claim
56 words
A copper free dental gold alloy consisting essentially of 25 to 40% silver, 40 to 60% gold, 5 to 20% palladium, 0.05 to 0.5% iridium, 0 to 6% indium 0 to 6% tin and 0 to 2% zinc, with the proviso that the named non-noble metals are present in a total amount of at least 2%.
Claim 3
Dependent Claim
55 words
The alloy of claim 1 consisting essentially of 28 to 35% silver, 50 to 58% gold, 5 to 10% palladium, 0.05 to 0.15% iridium, 2 to 5% indium, 0 to 3% tin and 0 to 1% zinc, with the proviso that the named non-noble metals are present in a total amount of at least 4%.
Claim 4
Dependent Claim
19 words
The alloy of claim 1 consisting essentially of 35.0% Ag, 55.0% Au, 5.0% In, 0.1% Ir, and 4.9% Pd.
Claim 5
Dependent Claim
23 words
The alloy of claim 1 consisting essentially of 30.0% Ag, 58.0% Au, 3.0% In, 0.1% Ir, 6.4% Pd, 2.0% Sn and 0.5% Zn.
Claim 6
Dependent Claim
23 words
The alloy of claim 1 consisting essentially of 29.5% Ag, 58.0% Au, 3.0% In, 0.1% Ir, 6.4% Pd, 2.0% Sn and 1.0% Zn.
Claim 7
Dependent Claim
23 words
The alloy of claim 1 consisting essentially of 30.5% Ag, 55.0% Au, 3.0% In, 0.1% Ir, 8.4% Pd, 2.0% Sn and 1.0% Zn.
Claim 8
Dependent Claim
21 words
The alloy of claim 1 consisting essentially of 30.0% Ag, 55% Au, 2.5% In, 0.1% Ir, 9.9% Pd and 2.5% Sn.
Claim 9
Dependent Claim
23 words
The alloy of claim 1 consisting essentially of 29.0% Ag, 55.0% Au, 4.0% In, 0.1% Ir, 9.9% Pd, 1.0% Sn and 1.0% Zn.
Claim 10
Dependent Claim
23 words
The alloy of claim 1 consisting essentially of 28.0% Ag, 55.0% Au, 5.0% In, 0.1% Ir, 9.9% Pd, 1.0% Sn and 1.0% Zn.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |