US4336290A
Expired / Lapsed
US
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Palladium alloys for fusion to porcelain
Assignee: 3M Unitek Corp
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Filing: 1981-04-13
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Granted: 1982-06-22
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Expires: 2001-04-13
Abstract
Abstract A semi-precious alloy for use in a dental restoration which does not discolor porcelain and remains ductile after firing of a porcelain jacket thereon. The alloy is 80-90% palladium, 5-15% indium, 1-5% gallium, 0.1-0.5% aluminum, 0.1-0.5% silicon, and 0.01-1.0% of at least one element from ruthenium and osmium.
Inventors
- 👤 Min H. Tsai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:10
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/239
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
39 words
A semi-precious castable dental alloy suitable for bonding with dental porcelain comprising about 80-90% palladium, 5-15% indium, 1-5% gallium, 0.1-0.5% aluminum, 0.1-0.5% silicon and 0.01-1.0% of a member selected from the group consisting of ruthenium, osmium and mixtures thereof.
Claim 2
Dependent Claim
39 words
A semi-precious castable dental alloy suitable for bonding with dental porcelain comprising about 80-90% palladium, 5-15% indium, 1-5% gallium, 0.1-0.5% aluminum, 0.1-0.5% silicon and 0.01-1.0% of a member selected from the group consisting of ruthenium, osmium and mixtures thereof.
Claim 3
Dependent Claim
38 words
A semi-precious castable dental alloy suitable for bonding with dental porcelain consisting essentially of: palladium: 80-90 percent; indium: 5-15 percent; gallium: 1-5 percent; aluminum: 0.1-0.5 percent; silicon: 0.1-0.5 percent; and ruthenium, osmium or a mixture thereof: 0.01-1.0 percent.
Claim 4
Dependent Claim
38 words
A semi-precious castable dental alloy suitable for bonding with dental porcelain consisting essentially of: palladium: 80-90 percent; indium: 5-15 percent; gallium: 1-5 percent; aluminum: 0.1-0.5 percent; silicon: 0.1-0.5 percent; and ruthenium, osmium or a mixture thereof: 0.01-1.0 percent.
Claim 5
Dependent Claim
24 words
The alloy defined in claim 2 formed as a cast body for intra-oral installation and further comprising a porcelain jacket fired on the body.
Claim 6
Dependent Claim
35 words
The alloy defined in claim 2 wherein the constituent elements consist essentially of. palladium: 84.8 percent; indium: 11.2 percent; gallium: 3.5 percent; aluminum: 0.15 percent; silicon: 0.20 percent; ruthenium: 0.07 percent; and osmium: 0.08 percent.
Claim 7
Dependent Claim
35 words
The alloy defined in claim 2 wherein the constituent elements consist essentially of: palladium: 80.0 percent; indium: 14.5 percent; gallium: 5.0 percent; aluminum: 0.18 percent; silicon: 0.20 percent; ruthenium: 0.06 percent; and osmium: 0.06 percent.
Claim 8
Dependent Claim
35 words
The alloy defined in claim 2 wherein the constituent elements consist essentially of: palladium: 85.0 percent; indium: 10.8 percent; gallium: 3.3 percent; aluminum: 0.25 percent; silicon: 0.25 percent; ruthenium: 0.2 percent; and osmium: 0.2 percent.
Claim 9
Dependent Claim
35 words
The alloy defined in claim 2 wherein the constituent elements consist essentially of: palladium: 87.0 percent; indium: 8.7 percent; gallium: 3.8 percent; aluminum: 0.15 percent; silicon: 0.20 percent; ruthenium: 0.07 percent; and osmium: 0.08 percent.
Claim 10
Dependent Claim
24 words
The alloy defined in claim 4 formed as a cast body for intra-oral installation, and further comprising a porcelain jacket fired on the body.
Claim 11
Dependent Claim
24 words
The alloy defined in claim 5 formed as a cast body for intra-oral installation, and further comprising a porcelain jacket fired on the body.
Claim 12
Dependent Claim
24 words
The alloy defined in claim 6 formed as a cast body for intra-oral installation, and further comprising a porcelain jacket fired on the body.
Claim 13
Dependent Claim
24 words
The alloy defined in claim 7 formed as a cast body for intra-oral installation, and further comprising a porcelain jacket fired on the body.
References Cited (Backward Citations)
US4261744A
Cited
US4319877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |