US4374085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-tin-copper-palladium alloy and amalgam thereof
Assignee: ALLEGHENY INTERNATIONAL ACCEPTANCE Corp
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Filing: 1980-05-29
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Granted: 1983-02-15
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Expires: 2000-05-29
Abstract
Abstract A silver-tin-copper-palladium alloy containing from 30 to 70% silver, 15 to 37% tin, at least 13% copper and from 0.05 to 0.95% palladium; and an amalgam thereof.
Inventors
- 👤 Kamal Asgar
- 👤 Steven H. Reichman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:17
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/06; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847; C22C30/00; C22C30/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
71 words
An amalgable dental alloy consisting essentially of, by weight, 30 to 70% silver, 15 to 37% tin, 0.05 to 0.95% palladium, up to 4% zinc, up to 6% indium, up to 5% manganese, up to 2% cadmium, up to 2% aluminum, up to 5% gallium, up to 2% ruthenium, up to 3% mercury, balance essentially copper; said alloy having at least 13% copper and no tin-mercury phase after trituration with mercury.
Claim 2
Dependent Claim
71 words
An amalgable dental alloy consisting essentially of, by weight, 30 to 70% silver, 15 to 37% tin, 0.05 to 0.95% palladium, up to 4% zinc, up to 6% indium, up to 5% manganese, up to 2% cadmium, up to 2% aluminum, up to 5% gallium, up to 2% ruthenium, up to 3% mercury, balance essentially copper; said alloy having at least 13% copper and no tin-mercury phase after trituration with mercury.
Claim 3
Dependent Claim
11 words
An alloy according to claim 1, having 0.1 to 0.9% palladium.
Claim 4
Dependent Claim
11 words
An alloy according to claim 2, having 0.2 to 0.8% palladium.
Claim 5
Dependent Claim
12 words
An alloy according to claim 1, having at least about 20% copper.
Claim 6
Dependent Claim
10 words
An alloy according to claim 4, having about 0.5% palladium.
Claim 7
Dependent Claim
65 words
An alloy according to claim 1, consisting essentially of, by weight, 30 to 60% silver, 20 to 35% tin, 0.1 to 0.9% palladium, up to 4% zinc, up to 6% indium, up to 5% manganese, up to 2% cadmium, up to 2% aluminum, up to 5% gallium, up to 2% ruthenium, up to 3% mercury, balance essentially copper; said alloy having at least 13% copper.
Claim 8
Dependent Claim
11 words
An alloy according to claim 6, having 0.2 to 0.8% palladium.
Claim 9
Dependent Claim
12 words
An alloy according to claim 6, having at least about 20% copper.
Claim 10
Dependent Claim
20 words
An alloy according to claim 1, having a silver plus tin plus palladium plus copper content of at least 95%.
Claim 11
Dependent Claim
33 words
An alloy according to claim 1, consisting essentially of, by weight, 40 to 55% silver, 25 to 32% tin, 0.2 to 0.8% palladium, balance essentially copper; said alloy having at least 13% copper.
Claim 12
Dependent Claim
89 words
An amalgam formed from 30 to 56% of mercury and 44 to 70% of a dental alloy; said dental alloy consisting essentially of, by weight, 30 to 70% silver, 15 to 37% tin, 0.05 to 0.95% palladium, up to 4% zinc, up to 6% indium, up to 5% manganese, up to 2% cadmium, up to 2% aluminum, up to 5% gallium, up to 2% ruthenium, up to 3% mercury, balance essentially copper; said dental alloy having at least 13% copper and said amalgam being free of a tin-mercury phase.
Claim 13
Dependent Claim
89 words
An amalgam formed from 30 to 56% of mercury and 44 to 70% of a dental alloy; said dental alloy consisting essentially of, by weight, 30 to 70% silver, 15 to 37% tin, 0.05 to 0.95% palladium, up to 4% zinc, up to 6% indium, up to 5% manganese, up to 2% cadmium, up to 2% aluminum, up to 5% gallium, up to 2% ruthenium, up to 3% mercury, balance essentially copper; said dental alloy having at least 13% copper and said amalgam being free of a tin-mercury phase.
Claim 14
Dependent Claim
15 words
An amalgam according to claim 11, wherein said dental alloy has 0.01 to 0.9% palladium.
Claim 15
Dependent Claim
15 words
An amalgam according to claim 12, wherein said dental alloy has 0.2 to 0.8% palladium.
Claim 16
Dependent Claim
16 words
An amalgam according to claim 11, wherein said dental alloy has at least about 20% copper.
Claim 17
Dependent Claim
14 words
An amalgam according to claim 14, wherein said dental alloy has about 0.5% palladium.
Claim 18
Dependent Claim
70 words
An amalgam according to claim 11, wherein said dental alloy consists essentially of, by weight, 30 to 60% silver, 20 to 35% tin, 0.1 to 0.9% palladium, up to 4% zinc, up to 6% indium, up to 5% manganese, up to 2% cadmium, up to 2% aluminum, up to 5% gallium, up to 2% ruthenium, up to 3% mercury, balance essentially copper; said dental alloy having at least 13% copper.
Claim 19
Dependent Claim
15 words
An amalgam according to claim 16, wherein said dental alloy has 0.2 to 0.8% palladium.
Claim 20
Dependent Claim
16 words
An amalgam according to claim 16, wherein said dental alloy has at least about 20% copper.
Claim 21
Dependent Claim
24 words
An amalgam according to claim 11, wherein said dental alloy has a silver plus tin plus palladium plus copper content of at least 95%.
Claim 22
Dependent Claim
38 words
An amalgam according to claim 11, wherein said dental alloy consists essentially of, by weight, 40 to 55% silver, 25 to 32% tin, 0.2 to 0.8% palladium, balance essentially copper; said dental alloy having at least 13% copper.
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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |