US4664629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental composition mixture
Assignee: Dentsply Research and Development Corp
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Filing: 1985-04-22
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Granted: 1987-05-12
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Expires: 2005-04-22
Abstract
Abstract By the present invention a dental alloy mixture is provided that is a combination of 20 to 70 percent by weight of cut alloy comprising silver, tin, and copper, with the copper present in an amount of 0 to 30 percent by weight of the cut alloy; and 30 to 80 percent by weight of spherical alloy comprising silver and cooper.
Inventors
- 👤 Michael R. Chodkowski, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A dental alloy mixture for use as a filling for dental preparations after amalgamation consisting essentially of: (a) from about 35% to about 45% by weight of said mixture of cut alloy consisting essentially of about 52% to about 62% silver, about 12% to about 15% copper, about 25% to about 34% tin and about 0% to about 1% zinc by weight of said cut alloy; and (b) from about 55% to about 65% by weight of said mixture of spherical alloy consisting essentially of about 49% to about 60% silver, about 17% to about 25% copper, about 29% to about 31% tin, and about 0.2% to about 1.2% palladium by weight of said spherical alloy.
Claim 2
Dependent Claim
116 words
A dental alloy mixture for use as a filling for dental preparations after amalgamation consisting essentially of: (a) from about 35% to about 45% by weight of said mixture of cut alloy consisting essentially of about 52% to about 62% silver, about 12% to about 15% copper, about 25% to about 34% tin and about 0% to about 1% zinc by weight of said cut alloy; and (b) from about 55% to about 65% by weight of said mixture of spherical alloy consisting essentially of about 49% to about 60% silver, about 17% to about 25% copper, about 29% to about 31% tin, and about 0.2% to about 1.2% palladium by weight of said spherical alloy.
Claim 3
Dependent Claim
41 words
The dental alloy mixture of claim 1 wherein said cut alloy is present in an amount between about 35% and 40% of said mixture and said spherical alloy is present in an amount between about 60% and 65% of said mixture.
Claim 4
Dependent Claim
77 words
The dental alloy mixture of claim 1 wherein said cut component consists essentially of about 54% to about 60% silver, about 13% to about 14% copper, and about 27% to about 32% tin by weight of said cut alloy; and said spherical alloy consists essentially of about 49.2% to about 49.5% silver, about 18% to about 21% copper, about 29% to about 31% tin, and about 0.3% to about 1% palladium by weight of said spherical alloy.
Claim 5
Dependent Claim
28 words
The dental alloy mixture of claim 1 amalgamated with about 40% to about 55% of mercury by weight of the combined weight of said mercury and said mixture.
Claim 6
Dependent Claim
28 words
The dental alloy mixture of claim 3 triturated with about 45% to about 50% of mercury by weight of the combined weight of said mercury and said mixture.
Claim 7
Dependent Claim
49 words
A method of dental restoration comprising providing a dental preparation for receipt of restorative material; triturating a dental alloy mixture in accordance with claim 1, 2, or 3; placing said triturated mass in said dental preparation; and packing said mass in said dental preparation to substantially fill said preparation.
Claim 8
Dependent Claim
30 words
The method of claim 6 wherein said trituration is with from about 40% to about 55% of mercury by weight of the combined weight of said mercury and said mixture.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |