US4008073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy powder for the production of dental amalgam
Assignee: Evonik Operations GmbH
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Filing: 1975-11-18
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Granted: 1977-02-15
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Expires: 1995-11-18
Abstract
Abstract Alloy powders suitable for the production of dental amalgams are prepared containing 75-92% silver, 8-23% copper, 1-10% tin and 0-2% zinc.
Inventors
- 👤 Rudolf Kropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:28
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: 13
Claim 1
Independent Claim
30 words
An alloy powder suitable for production of dental amalgams consisting essentially of 75-92% silver, 8-23% copper, 1-10% tin and zinc, the zinc being present in an amount up to 2%.
Claim 2
Dependent Claim
30 words
An alloy powder suitable for production of dental amalgams consisting essentially of 75-92% silver, 8-23% copper, 1-10% tin and zinc, the zinc being present in an amount up to 2%.
Claim 3
Dependent Claim
12 words
An alloy powder according to claim 1 containing 0.2 to 2% zinc.
Claim 4
Dependent Claim
76 words
An alloy powder suitable for production of dental amalgams consisting essentially of 75-92% silver, 8-23% copper, 1-10% tin and 0-2% zinc, said powder being a mixture of two separate alloy powder components, the first of which is 60- 95% of the total and consists of 80-92% silver, 8-20% copper, 0-8% tin and 0-2% zinc, while the second of which is 40-5% of the total and consists of 50-75% silver, 0-25% copper, 20-50% tin and 0-2% zinc.
Claim 5
Dependent Claim
76 words
An alloy powder suitable for production of dental amalgams consisting essentially of 75-92% silver, 8-23% copper, 1-10% tin and 0-2% zinc, said powder being a mixture of two separate alloy powder components, the first of which is 60- 95% of the total and consists of 80-92% silver, 8-20% copper, 0-8% tin and 0-2% zinc, while the second of which is 40-5% of the total and consists of 50-75% silver, 0-25% copper, 20-50% tin and 0-2% zinc.
Claim 6
Dependent Claim
58 words
A method of producing the alloy powder of claim 3 comprising mixing two separate components, the first of which is 60-95% of the total and consists of 80-92% silver, 8-20% copper, 0-8% tin and 0-2% zinc while the second of which is 40-5% of the total and consists of 50-75% silver, 0-25% copper, 20-50% tin and 0-2% zinc.
Claim 7
Dependent Claim
28 words
A process according to claim 4 including the steps of producing the first component by atomizing a melt and producing the second component by milling an alloy bar.
Claim 8
Dependent Claim
19 words
An alloy powder suitable for production of dental amalgams consisting essentially of 90% silver, 8% copper and 2% tin.
Claim 9
Dependent Claim
19 words
An alloy powder suitable for production of dental amalgams consisting essentially of 90% silver, 8% copper and 2% tin.
Claim 10
Dependent Claim
19 words
An alloy powder suitable for production of dental amalgams consisting essentially of 85% silver, 10% copper and 5% tin.
Claim 11
Dependent Claim
19 words
An alloy powder suitable for production of dental amalgams consisting essentially of 85% silver, 10% copper and 5% tin.
Claim 12
Dependent Claim
19 words
An alloy powder suitable for production of dental amalgams consisting essentially of 82% silver, 10% copper and 8% tin.
Claim 13
Dependent Claim
19 words
An alloy powder suitable for production of dental amalgams consisting essentially of 82% silver, 10% copper and 8% tin.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |