US4194907A
Expired / Lapsed
US
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Gold alloys for fusion to porcelain
Assignee: 3M Co
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Filing: 1978-10-20
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Granted: 1980-03-25
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Expires: 1998-10-20
Abstract
Abstract A gold alloy for use in a dental restoration which does not cause discoloration and greening of dental porcelain after being cast and having a porcelain jacket fired thereon. The gold alloy also produces extremely clean castings. The alloy is 30-50% gold, 30-50% palladium, 5-30% silver, 0.01-5% of at least one element from silicon, boron, germanium and mixtures thereof and 0.01-1.0% of ruthenium. Other elements are included for strength.
Inventors
- 👤 Min H. Tsai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:42
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: 24
Claim 1
Independent Claim
49 words
A castable dental alloy suitable for bonding with dental porcelain comprising about 30-50% gold, 30-50% palladium, 5-30% silver, 0.01-1.0% ruthenium and a member selected from the groups consisting of silicon, boron, germanium and mixtures thereof in an amount sufficient to prevent greening and discoloration of porcelains when fired thereon.
Claim 2
Dependent Claim
49 words
A castable dental alloy suitable for bonding with dental porcelain comprising about 30-50% gold, 30-50% palladium, 5-30% silver, 0.01-1.0% ruthenium and a member selected from the groups consisting of silicon, boron, germanium and mixtures thereof in an amount sufficient to prevent greening and discoloration of porcelains when fired thereon.
Claim 3
Dependent Claim
24 words
The alloy defined in claim 1 containing about 0.01-5% of a member selected from the group consisting of silicon, boron, germanium and mixtures thereof.
Claim 4
Dependent Claim
16 words
The alloy defined in claim 2 further comprising elements for increasing the strength of said alloy.
Claim 5
Dependent Claim
59 words
A castable dental alloy suitable for bonding with dental porcelain without a green color after porcelain is fired on the cast alloy, consisting essentially of: gold: 30-50 percent; palladium: 30-50 percent; silver: 5-30 percent; indium: 0-10 percent; tin: 0-10 percent; ruthenium: 0.01-1.0 percent; other platinum family elements 0-3 percent, and; silicon, boron, germanium or a mixture thereof 0.01-5 percent.
Claim 6
Dependent Claim
59 words
A castable dental alloy suitable for bonding with dental porcelain without a green color after porcelain is fired on the cast alloy, consisting essentially of: gold: 30-50 percent; palladium: 30-50 percent; silver: 5-30 percent; indium: 0-10 percent; tin: 0-10 percent; ruthenium: 0.01-1.0 percent; other platinum family elements 0-3 percent, and; silicon, boron, germanium or a mixture thereof 0.01-5 percent.
Claim 7
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 8
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 32.3 percent; Palladium: 45.0 percent; Silver: 16.2 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.4 percent; Ruthenium: 0.1 percent.
Claim 9
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 43.0 percent; Palladium: 42.0 percent; Silver: 8.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent.
Claim 10
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 40.0 percent; Palladium: 42.0 percent; Silver: 8.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 3.2 percent; Ruthenium: 0.1 percent.
Claim 11
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 40.0 percent; Palladium: 45.0 percent; Silver: 8.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Germanium: 0.2 percent; Ruthenium: 0.1 percent.
Claim 12
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 39.0 percent; Palladium: 44.0 percent; Silver: 10.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Boron: 0.2 percent; Ruthenium: 0.1 percent.
Claim 13
Dependent Claim
37 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 39.0 percent; Palladium: 44.0 percent; Silver: 10.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.1 percent; Boron: 0.1 percent; Ruthenium: 0.1 percent.
Claim 14
Dependent Claim
37 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 39.0 percent; Palladium: 44.0 percent; Silver: 10.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.15 percent; Germanium: 0.05 percent; Ruthenium: 0.1 percent.
Claim 15
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 42.0 percent; Silver: 7.7 percent; Indium: 1.0 percent; Tin: 5.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent.
Claim 16
Dependent Claim
34 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 42.0 percent; Silver: 7.7 percent; Indium: 5.0 percent; Tin: 1.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent.
Claim 17
Dependent Claim
37 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 40.0 percent; Silver: 7.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent; Platinum: 2.0 percent.
Claim 18
Dependent Claim
37 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 40.0 percent; Silver: 7.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent; Rhodium: 2.0 percent.
Claim 19
Dependent Claim
40 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 40.0 percent; Silver: 7.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent; Platinum: 1.6 percent; Rhenium: 0.4 percent.
Claim 20
Dependent Claim
40 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 40.0 percent; Silver: 7.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent; Platinum: 1.60 percent; Iridium: 0.4 percent.
Claim 21
Dependent Claim
37 words
The alloy defined in claim 4 wherein the constituent elements consist essentially of: Gold: 44.0 percent; Palladium: 41.0 percent; Silver: 7.7 percent; Indium: 2.0 percent; Tin: 4.0 percent; Silicon: 0.2 percent; Ruthenium: 0.1 percent; Osmium: 1.0 percent.
Claim 22
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 23
Dependent Claim
24 words
The alloy defined in claim 7 formed as a cast body for intra-oral installation, and further comprising a procelain jacket fired on the body.
Claim 24
Dependent Claim
24 words
The alloy defined in claim 8 formed as a cast body for intra-oral installation, and further comprising a porcelain jacket fired on the body.
References Cited (Backward Citations)
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US3667936A
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US3804616A
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US3961420A
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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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |