US4080199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lathe cut dental alloy powder
Assignee: Dentsply Research and Development Corp
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Filing: 1976-05-27
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Granted: 1978-03-21
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Expires: 1996-05-27
Abstract
Abstract A new dental alloy powder comprising lathe cut, homogeneous particles having a composition of 35 to 50 percent silver, 20 to 30 percent copper and 25 to 35 percent tin.
Inventors
- 👤 Pei Sung
- 👤 Frederic James Schweder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:02
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/847; Y; Y10; Y10S; Y10S75/00; Y10S75/955
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A corrosion resistant, readily amalgamatable dental alloy comprising lathe cut particles with each particle consisting essentially of a homogeneous mixture of, by weight, 41 to 46 percent silver, 22 to 25 percent copper, 26 to 29 percent tin and less than 2% zinc.
Claim 2
Dependent Claim
43 words
A corrosion resistant, readily amalgamatable dental alloy comprising lathe cut particles with each particle consisting essentially of a homogeneous mixture of, by weight, 41 to 46 percent silver, 22 to 25 percent copper, 26 to 29 percent tin and less than 2% zinc.
Claim 3
Dependent Claim
17 words
A dental alloy according to claim 1 wherein the particles are less than 400 mesh in size.
Claim 4
Dependent Claim
18 words
A dental alloy according to claim 1 wherein the silver to tin ratio is from 1:1 to 2:1.
Claim 5
Dependent Claim
17 words
A dental alloy according to claim 1 wherein the tin to copper ratio is 5/6:1 to 13/4:1.
Claim 6
Dependent Claim
26 words
A dental alloy according to claim 1 wherein the silver to tin ratio is 1:1 to 2:1 and the tin to copper ratio 5/6:1 to 13/4:1.
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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |