US4591483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noble metal alloys for dental uses
Assignee: Evonik Operations GmbH
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Filing: 1985-02-22
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Granted: 1986-05-27
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Expires: 2005-02-22
Abstract
Abstract There are described noble metal alloys for dental purposes, especially for firing on dental porcelain which are low melting, do not discolor the porcelain, are repeatedly castable, and making possible brazing joints. These alloys containing 20 to 65% gold, 25 to 65% palladium, 0 to 7% gallium, 0.2 to 11% indium and/or tin, 0 to 2% copper, 0.05 to 1% ruthenium, iridium and/or rhenium, 0 to 1% vanadium, 0 to 1% iron and additionally 0.5 to 15% cobalt, with the proviso that the content of base metals must exceed 5%.
Inventors
- 👤 M. H. A Nawaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:23
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; C22C5/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A noble metal alloy suitable for dental purposes consisting of 20 to 65% gold, 25 to 65% palladium, 0 to 7% gallium, 0.2 to 11% of at least one of the elements indium and tin, 0 to 2% copper, 0.05 to 1% of at least one of the elements ruthenium, iridium and rhenium, 0 to 1% vanadium, 0 to 1% iron and 0.5 to 15% cobalt, with the proviso that the content of base metals is over 5%.
Claim 2
Dependent Claim
78 words
A noble metal alloy suitable for dental purposes consisting of 20 to 65% gold, 25 to 65% palladium, 0 to 7% gallium, 0.2 to 11% of at least one of the elements indium and tin, 0 to 2% copper, 0.05 to 1% of at least one of the elements ruthenium, iridium and rhenium, 0 to 1% vanadium, 0 to 1% iron and 0.5 to 15% cobalt, with the proviso that the content of base metals is over 5%.
Claim 3
Dependent Claim
48 words
A noble metal alloy according to claim 1 containing 50 to 65% gold, 30 to 40% palladium, 4 to 10% indium, 0 to 2% tin, 1 to 2% gallium, 0.05 to 1% of at least one of the elements ruthenium, rhenium, and iridium, and 1 to 5% cobalt.
Claim 4
Dependent Claim
47 words
A noble metal alloy according to claim 2 containing 60 to 65% gold, 30 to 35% palladium, 4.5 to 6% indium, 0 to 2% tin, 1 to 2% gallium, 0.05 to 0.3% of at least one of the elements ruthenium, iridium, rhenium, and 1 to 3% cobalt.
Claim 5
Dependent Claim
56 words
A noble metal alloy according to claim 1 containing 50 to 55% gold, 35 to 40% palladium, 6 to 10% indium, 0 to 1% tin, 1 to 2% gallium, 0.05 to 1% of at least one of the elements ruthenium, rhenium, and iridium, 1.5 to 12.5% cobalt, 0 to 1% vanadium, and 0 to 1% iron.
Claim 6
Dependent Claim
52 words
A noble metal alloy according to claim 1 containing 20 to 50% gold, 40 to 60% palladium, 0.2 to 8% indium, 0.2 to 6% tin, 0 to 2% copper, 1 to 5% gallium, 0.05 to 1% of at least one of the elements ruthenium, iridium, and rhenium, and 2 to 12% cobalt.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |