US4007040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard copper free dental gold alloys
Assignee: Evonik Operations GmbH
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Filing: 1976-01-27
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Granted: 1977-02-08
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Expires: 1996-01-27
Abstract
Abstract A hard, copper free gold alloy for dental purposes is prepared containing 61 to 85 weight % gold, 8 to 15 weight % platinum, 0 to 4 weight % palladium, 5 to 15 weight % silver and 2 to 5 weight % zinc. 0.05 to 0.1 weight % of the platinum can be replaced by iridium.
Inventors
- 👤 Rudolf Kropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:31
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
65 words
A hard copper free gold alloy suitable for dental purposes consisting essentially of (a) 61 to 85 weight of gold, 8 to 15 weight % platinum, 0 to 4 weight % palladium, 5 to 15 weight % silver and 2 to 5 weight % zinc or (b) an alloy as defined in (a) with 0.05 to 0.1 weight % of the platinum replaced by iridium.
Claim 2
Dependent Claim
65 words
A hard copper free gold alloy suitable for dental purposes consisting essentially of (a) 61 to 85 weight of gold, 8 to 15 weight % platinum, 0 to 4 weight % palladium, 5 to 15 weight % silver and 2 to 5 weight % zinc or (b) an alloy as defined in (a) with 0.05 to 0.1 weight % of the platinum replaced by iridium.
Claim 3
Dependent Claim
58 words
The composition of claim 1 containing (a) 69 to 72 weight % gold, 11 to 14 weight % platinum, 2 to 4 weight % palladium, 9 to 12 weight % silver and 2.5 to 4 weight % zinc or (b) the alloy as defined in (a) with 0.05 to 0.1 weight % of the platinum replaced by iridium.
Claim 4
Dependent Claim
8 words
The composition of claim 2 which is (a).
Claim 5
Dependent Claim
8 words
The composition of claim 2 which is (b).
Claim 6
Dependent Claim
8 words
The composition of claim 1 which is (a).
Claim 7
Dependent Claim
8 words
The composition of claim 1 which is (b).
Claim 8
Dependent Claim
59 words
The composition of claim 1 which consists essentially of (a) 61 to 85 weight % gold, 8 to 11 weight % platinum, 0 to 1 weight % palladium, 5 to 15 weight % silver and 2 weight % zinc or (b) the alloy as defined in (a) with 0.05 to 0.1 weight % of the platinum replaced by iridium.
Claim 9
Dependent Claim
8 words
The composition of claim 7 which is (a).
Claim 10
Dependent Claim
8 words
The composition of claim 8 which is (b).
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |