US4077560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental solder
Assignee: Johnson and Johnson
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Filing: 1976-04-12
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Granted: 1978-03-07
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Expires: 1996-04-12
Abstract
Abstract The invention relates to dental solder particularly suitable for joining parts of structural frameworks made of non-precious metal alloys, the framework being used in the preparation of bridges, crowns and the like. The solder compositions consist essentially of about 69 to 75% nickel, about 14 to 19.9% chromium, about 4 to 5.5% silicon and about 2.5 to 6% boron. The compositions may be modified to include up to about 6% molybdenum to increase corrosion resistance. The solder has a fusion temperature in the range of from about 1800 DEG to about 1950 DEG F and a diametrial tensile strength of at least 35,000 p.s.i. and a solder joint tensile strength of at least 70,000 p.s.i.
Inventors
- 👤 Pei Sung
- 👤 James Lee-You
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:55
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3033; B23K35/304
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A method for joining units of a dental restoration comprising: heating the metal surfaces of the dental restoration structural units to be joined at the point of desired juncture in the reducing zone of a flame; introducing to the heated metal surfaces, a dental solder formed from an alloy consisting of, on a weight percent basis, from about 65% to 75% nickel, about 14 to 19.9% chromium about 4 to 5.5% silicon, about 2.5 to 6% boron and 0 to about 6% molybdenum; maintaining the flame until the flow of solder has initiated; and thereafter, removing the unfused solder and the heat source and allowing to cool to obtain a soldered joint having a tensile strength of at least 70,000 p.s.i.
Claim 2
Independent Claim
121 words
A method for joining units of a dental restoration comprising: heating the metal surfaces of the dental restoration structural units to be joined at the point of desired juncture in the reducing zone of a flame; introducing to the heated metal surfaces, a dental solder formed from an alloy consisting of, on a weight percent basis, from about 65% to 75% nickel, about 14 to 19.9% chromium about 4 to 5.5% silicon, about 2.5 to 6% boron and 0 to about 6% molybdenum; maintaining the flame until the flow of solder has initiated; and thereafter, removing the unfused solder and the heat source and allowing to cool to obtain a soldered joint having a tensile strength of at least 70,000 p.s.i.
References Cited (Backward Citations)
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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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |