Patent US4062676A successfully refreshed from Google Patents.
US4062676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gold alloy for firing on porcelain for dental purposes
Assignee: Evonik Operations GmbH
•
Filing: 1976-07-06
•
Granted: 1977-12-13
•
Expires: 1996-07-06
Abstract
Abstract Gold alloys for firing on porcelain for dental purposes are prepared from 60 to 90 weight % gold, 5 to 35 weight % platinum, 0.1 to 3 weight % indium, 0 to 10 weight % palladium, 0.5 to 3 weight % rhodium, 0 to 3 weight % tin, 0.1 to 2 weight % tantalum and/or tungsten and 0.3 to 2 weight % zinc, the weight ratio of the platinum group metals to zinc to tantalum and/or tungsten are 15-30:1:0.5-1.3.
Inventors
- 👤 Helmut Knosp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:04
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
71 words
A gold alloy suitable to have porcelain fired thereon consisting of 60 to 90% gold, 5 to 35% platinum, 0.1 to 3% indium, 0 to 10% palladium, 0 to 3% tin, 0.5 to 3% rhodium, 0.1 to 2% of at least one member of the group consisting of tantalum and tungsten, and 0.3 to 2% zinc, the weight ratio of the platinum group metals to zinc to said member being 15-30:1:0.5-1.3.
Claim 2
Dependent Claim
71 words
A gold alloy suitable to have porcelain fired thereon consisting of 60 to 90% gold, 5 to 35% platinum, 0.1 to 3% indium, 0 to 10% palladium, 0 to 3% tin, 0.5 to 3% rhodium, 0.1 to 2% of at least one member of the group consisting of tantalum and tungsten, and 0.3 to 2% zinc, the weight ratio of the platinum group metals to zinc to said member being 15-30:1:0.5-1.3.
Claim 3
Dependent Claim
13 words
A gold alloy according to claim 1 wherein said weight ratio is 25:1:1.
Claim 4
Dependent Claim
12 words
A gold alloy according to claim 1 which is free of palladium.
Claim 5
Dependent Claim
13 words
A gold alloy according to claim 1 which contains at least 1.9% palladium.
Claim 6
Dependent Claim
10 words
A gold alloy according to claim 4 free of tin.
Claim 7
Dependent Claim
12 words
A gold alloy according to claim 4 containing at least 0.6% tin.
Claim 8
Dependent Claim
10 words
A gold alloy according to claim 1 free of tin.
Claim 9
Dependent Claim
12 words
A gold alloy according to claim 1 containing at least 0.6% tin.
Claim 10
Dependent Claim
12 words
A gold alloy according to claim 1 wherein said member is tantalum.
Claim 11
Dependent Claim
12 words
A gold alloy according to claim 1 wherein said member is tungsten.
Claim 12
Dependent Claim
24 words
A gold alloy according to claim 1 wherein said member is a mixture of tungsten and tantalum, the mixture containing 20 to 50% tungsten.
References Cited (Backward Citations)
US1987452A
Cited
DE1134520B
Cited
US2980998A
Cited
GB957493A
Cited
US3413723A
Cited
US3666540A
Cited
DE2424575A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |