Patent US3963484A successfully refreshed from Google Patents.
US3963484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental amalgam alloys
Assignee: Individual
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Filing: 1974-08-20
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Granted: 1976-06-15
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Expires: 1994-08-20
Abstract
Abstract A two-component amalgam alloy system comprises as a first component a standard silver-tin amalgam alloy, and as a second component a copper base alloy. The two components are intermixed and amalgamated with mercury to form a dental amalgam from which the highly corrodible tin-mercury (gamma-2) phase has been removed and the readily tarnishable and inter-granular fracturable (brittle) silver-mercury (gamma-1) phase can be reduced.
Inventors
- 👤 Nikhil K. Sarkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:41
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/06; C22C5/08; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
An improved dental alloy consisting essentially of a mixture of a first component alloy and a second component alloy suitable for amalgamation with mercury to form an improved dental amalgam, a. said first component alloy consisting essentially of at least 65% silver, an operable amount of tin up to and including 29% maximum, an operable amount of copper up to and including 6% maximum, and an operable amount of zinc up to and including 2% maximum, by weight of said first component alloy; b. said second component alloy consisting essentially of a copper-silver alloy containing more than 50.00% copper; c. said first component alloy comprising about 70 to 90% by weight of said alloy mixture and said second component alloy comprising about 10 to 30% by weight of said alloy mixture.
Claim 2
Dependent Claim
131 words
An improved dental alloy consisting essentially of a mixture of a first component alloy and a second component alloy suitable for amalgamation with mercury to form an improved dental amalgam, a. said first component alloy consisting essentially of at least 65% silver, an operable amount of tin up to and including 29% maximum, an operable amount of copper up to and including 6% maximum, and an operable amount of zinc up to and including 2% maximum, by weight of said first component alloy; b. said second component alloy consisting essentially of a copper-silver alloy containing more than 50.00% copper; c. said first component alloy comprising about 70 to 90% by weight of said alloy mixture and said second component alloy comprising about 10 to 30% by weight of said alloy mixture.
Claim 3
Dependent Claim
29 words
The improved dental alloy defined in claim 1, and wherein said first component alloy further contains mercury up to and including 3% by weight of said first component alloy.
Claim 4
Dependent Claim
38 words
The new improved dental alloy defined in claim 1, wherein the silver content of said first component alloy is preferably in the range of from about 65% to and including 75% by weight of said first component alloy.
Claim 5
Dependent Claim
38 words
The new improved dental alloy defined in claim 1, wherein the tin content of said first component alloy is preferably in the range of from about 20% to and including 29% by weight of said first component alloy.
Claim 6
Dependent Claim
38 words
The new improved dental alloy defined in claim 2, wherein the silver content of said first component alloy is preferably in the range of from about 65% to and including 75% by weight of said first component alloy.
Claim 7
Dependent Claim
38 words
The new improved dental alloy defined in claim 2, wherein the tin content of said first component alloy is preferably in the range of from about 20% to and including 29% by weight of said first component alloy.
Claim 8
Dependent Claim
159 words
An improved dental alloy consisting essentially of a mixture of a first component alloy and a second component alloy suitable for amalgamation with mercury to form an improved dental amalgam, a. said first component alloy consisting essentially of at least 65% silver, an operable amount of tin up to and including 29% maximum, an operable amount of copper up to and including 6% maximum, and an operable amount of zinc up to and including 2% maximum, by weight of said first component alloy; b. said second component alloy consisting essentially of a ternary or quaternary copper-base alloy selected from the following metals within the following composition limits: Silver up to and including 49.00%,
Tin up to and including 10.00%,
Zinc up to and including 5.00%,
Copper balance, c. said first component alloy comprising about 70 to 90% by weight of said alloy mixture and said second component alloy comprising about 10 to 30% by weight of said alloy mixture.
Claim 9
Dependent Claim
159 words
An improved dental alloy consisting essentially of a mixture of a first component alloy and a second component alloy suitable for amalgamation with mercury to form an improved dental amalgam, a. said first component alloy consisting essentially of at least 65% silver, an operable amount of tin up to and including 29% maximum, an operable amount of copper up to and including 6% maximum, and an operable amount of zinc up to and including 2% maximum, by weight of said first component alloy; b. said second component alloy consisting essentially of a ternary or quaternary copper-base alloy selected from the following metals within the following composition limits: Silver up to and including 49.00%,
Tin up to and including 10.00%,
Zinc up to and including 5.00%,
Copper balance, c. said first component alloy comprising about 70 to 90% by weight of said alloy mixture and said second component alloy comprising about 10 to 30% by weight of said alloy mixture.
Claim 10
Dependent Claim
29 words
The new improved dental alloy defined in claim 7, wherein said first component alloy further contains mercury up to and including 3% by weight of said first component alloy.
Claim 11
Dependent Claim
38 words
The new improved dental alloy defined in claim 7, wherein the silver content of said first component alloy is preferably in the range of from about 65% to and including 75% by weight of said first component alloy.
Claim 12
Dependent Claim
38 words
The new improved dental alloy defined in claim 7, wherein the tin content of said first component alloy is preferably in the range of from about 20% to and including 29% by weight of said first component alloy.
Claim 13
Dependent Claim
38 words
The new improved dental alloy defined in claim 8, wherein the silver content of said first component alloy is preferably in the range of from about 65% to and including 75% by weight of said first component alloy.
Claim 14
Dependent Claim
38 words
The new improved dental alloy defined in claim 8, wherein the tin content of said first component alloy is preferably in the range of from about 20% to and including 29% by weight of said first component alloy.
Claim 15
Dependent Claim
170 words
An improved dental alloy consisting essentially of a mixture of a first component alloy and a second component alloy suitable for amalgamation with mercury to form an improved dental amalgam, a. said first component alloy consisting essentially of at least 65% silver, an operable amount of tin up to and including 29% maximum, an operable amount of copper up to and including 6% maximum, and an operable amount of zinc up to and including 2% maximum, by weight of said first component alloy; b. said second component alloy consisting essentially of a binary, ternary, quaternary or quinary amalgamated copperbase alloy selected from the following metals within the following composition limits: Silver up to and including 49.00%
Tin up to and including 1.00%
Zinc up to and including 5.00%
Mercury up to and including 20.00% maximum
and Copper balance, c. said first component alloy comprising about 70 to 90% by weight of said alloy mixture and said second component alloy comprising about 10 to 30% by weight of said alloy mixture.
Claim 16
Dependent Claim
170 words
An improved dental alloy consisting essentially of a mixture of a first component alloy and a second component alloy suitable for amalgamation with mercury to form an improved dental amalgam, a. said first component alloy consisting essentially of at least 65% silver, an operable amount of tin up to and including 29% maximum, an operable amount of copper up to and including 6% maximum, and an operable amount of zinc up to and including 2% maximum, by weight of said first component alloy; b. said second component alloy consisting essentially of a binary, ternary, quaternary or quinary amalgamated copperbase alloy selected from the following metals within the following composition limits: Silver up to and including 49.00%
Tin up to and including 1.00%
Zinc up to and including 5.00%
Mercury up to and including 20.00% maximum
and Copper balance, c. said first component alloy comprising about 70 to 90% by weight of said alloy mixture and said second component alloy comprising about 10 to 30% by weight of said alloy mixture.
Claim 17
Dependent Claim
29 words
The new improved dental alloy defined in claim 13, wherein said first component alloy further contains mercury up to and including 3% by weight of said first component alloy.
Claim 18
Dependent Claim
38 words
The new improved dental alloy defined in claim 13 wherein the silver content of said first component alloy is preferably in the range of from about 65% to and including 75% by weight of said first component alloy.
Claim 19
Dependent Claim
38 words
The new improved dental alloy defined in claim 13, wherein the tin content of said first component alloy is preferably in the range of from about 20% to and including 29% by weight of said first component alloy.
Claim 20
Dependent Claim
38 words
The new improved dental alloy defined in claim 14, wherein the silver content of said first component alloy is preferably in the range of from about 65% to and including 75% by weight of said first component alloy.
Claim 21
Dependent Claim
38 words
The new improved dental alloy defined in claim 14, wherein the tin content of said first component alloy is preferably in the range of from about 20% to and including 29% by weight of said first component alloy.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |