Patent US3975192A successfully refreshed from Google Patents.
US3975192A
Expired / Lapsed
US
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Dental alloy and amalgam
Assignee: Kerr Corp
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Filing: 1975-03-28
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Granted: 1976-08-17
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Expires: 1995-03-28
Abstract
Abstract A dental amalgam which comprises about 40 to 50 weight percent mercury and about 50 to 60 weight percent of an alloy which comprises 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 3 times greater than the atomic percentage of tin.
Inventors
- 👤 Harold H. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:28
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/06; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847; C22C7/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
A dental alloy which consists essentially of about 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 3 times greater than the atomic percentage of tin.
Claim 2
Dependent Claim
51 words
A dental alloy which consists essentially of about 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 3 times greater than the atomic percentage of tin.
Claim 3
Dependent Claim
21 words
The alloy of claim 1 in which zinc replaces silver and/or copper up to a maximum of 2 percent by weight.
Claim 4
Dependent Claim
26 words
A dental composition amalgamatable by trituration with mercury which consists essentially of about 51.5 weight percent silver, 19.0 weight percent copper and 29.5 weight percent tin.
Claim 5
Dependent Claim
26 words
A dental composition amalgamatable by trituration with mercury which consists essentially of about 51.5 weight percent silver, 19.0 weight percent copper and 29.5 weight percent tin.
Claim 6
Dependent Claim
69 words
A dental amalgam which consists essentially of about 40 to 50 weight percent mercury and about 50 to 60 weight percent of an alloy which comprises 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 3 times greater than the atomic percentage of tin.
Claim 7
Dependent Claim
69 words
A dental amalgam which consists essentially of about 40 to 50 weight percent mercury and about 50 to 60 weight percent of an alloy which comprises 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 3 times greater than the atomic percentage of tin.
Claim 8
Dependent Claim
26 words
The amalgam of claim 4 in which the alloy consists essentially of about 51.5 weight percent silver, 19.0 weight percent copper and 29.5 weight percent tin.
Claim 9
Dependent Claim
59 words
A dental alloy which consists essentially of about 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 75 to 76 percent and the atomic percentage of tin is from about 24 to 25 percent.
Claim 10
Dependent Claim
59 words
A dental alloy which consists essentially of about 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 75 to 76 percent and the atomic percentage of tin is from about 24 to 25 percent.
Claim 11
Dependent Claim
77 words
A dental amalgam which consists essentially of about 40 to 50 weight percent mercury and about 50 to 60 weight percent of an alloy which comprises 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 75 to 76 percent and the atomic percentage of tin is from about 24 to 25 percent.
Claim 12
Dependent Claim
77 words
A dental amalgam which consists essentially of about 40 to 50 weight percent mercury and about 50 to 60 weight percent of an alloy which comprises 46 to 53 weight percent silver, 18 to 24 weight percent copper and 29 to 34 weight percent tin, and where the atomic percentage of the total amount of silver plus copper is about 75 to 76 percent and the atomic percentage of tin is from about 24 to 25 percent.
References Cited (Backward Citations)
US2281991A
Cited
US3871876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |