US4164419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered alloy for dental amalgam
Assignee: Shofu Dental Mfg Co Ltd
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Filing: 1978-03-27
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Granted: 1979-08-14
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Expires: 1998-03-27
Abstract
Abstract A dental alloy capable of combination with mercury to form a dental amalgam comprising by weight 20% and above silver, 20 to 50% tin, 9.5 to 50% copper, and 0.5% and above indium.
Inventors
- 👤 Hiroyuki Kaji
- 👤 Narishige Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:58
CPC Classifications
C; C22; C22C; C22C30/00; C22C30/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847; C22C30/02; C22C5/00; C22C5/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
An amalgamable alloy for a dental amalgam consisting essentially, by weight, of at least 50% silver, 20 to 30% tin, 3 to 6% indium and 11 to 20% copper, said copper being present in an amount sufficient to form the intermetallic compound Cu 6 Sn 5 with the tin and to provide only minimal amounts of unalloyed tin to form the gamma-II phase upon amalgamation.
Claim 2
Dependent Claim
65 words
An amalgamable alloy for a dental amalgam consisting essentially, by weight, of at least 50% silver, 20 to 30% tin, 3 to 6% indium and 11 to 20% copper, said copper being present in an amount sufficient to form the intermetallic compound Cu 6 Sn 5 with the tin and to provide only minimal amounts of unalloyed tin to form the gamma-II phase upon amalgamation.
Claim 3
Dependent Claim
24 words
A dental alloy capable of amalgamation with mercury, which consists essentially, by weight, of about 60% silver, 22% tin, 13% copper and 5% indium.
Claim 4
Dependent Claim
24 words
A dental alloy capable of amalgamation with mercury, which consists essentially, by weight, of about 60% silver, 22% tin, 13% copper and 5% indium.
Claim 5
Dependent Claim
35 words
An improved dental amalgam consisting in weight percentage of 18 to 35% silver, 11 to 16% tin, 6 to 15% copper, 1 to 5 % indium, and the balance mercury at the time of trituration.
Claim 6
Dependent Claim
35 words
An improved dental amalgam consisting in weight percentage of 18 to 35% silver, 11 to 16% tin, 6 to 15% copper, 1 to 5 % indium, and the balance mercury at the time of trituration.
Claim 7
Dependent Claim
24 words
A dental alloy capable of amalgammation with mercury, which consists essentially, by weight, of about 60% silver, 23% tin, 12% copper and 5% indium.
Claim 8
Dependent Claim
24 words
A dental alloy capable of amalgammation with mercury, which consists essentially, by weight, of about 60% silver, 23% tin, 12% copper and 5% indium.
References Cited (Backward Citations)
US1959668A
Cited
US3305356A
Cited
US3440039A
Cited
US3591370A
Cited
US3871876A
Cited
US3975192A
Cited
US3985558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |