US4412970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Palladium based dental alloys
Assignee: Jeneric Industries Inc
•
Filing: 1982-12-06
•
Granted: 1983-11-01
•
Expires: 2002-12-06
Abstract
Abstract A dental alloy for use in porcelain-fused-to-metal restorations including palladium, cobalt, indium, tin, aluminum and rhenium. The aluminum protects the alloy during torch melting and during the porcelain firing process through the formation of a protective oxide. The rhenium provides grain refining for the alloy to increase its elongation, tensile strength, and thus toughness. The alloy must be made under vacuum or in an inert atmosphere to avoid the formation of bubbles in the porcelain during the porcelain firing process.
Inventors
- 👤 Arun Prasad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:47
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A grain-refined palladium based dental alloy for porcelain-fused-to-metal restorations consisting by weight of essentially about 75-80% palladium, 8-10% cobalt, 0-5% indium, 0-10% tin, 0.05-0.2% aluminum and 0.15-0.50% rhenium, the total of the constituents being 100%.
Claim 2
Dependent Claim
35 words
A grain-refined palladium based dental alloy for porcelain-fused-to-metal restorations consisting by weight of essentially about 75-80% palladium, 8-10% cobalt, 0-5% indium, 0-10% tin, 0.05-0.2% aluminum and 0.15-0.50% rhenium, the total of the constituents being 100%.
Claim 3
Dependent Claim
12 words
The alloy of claim 1 wherein the rhenium concentration is about 0.2%.
Claim 4
Dependent Claim
12 words
The alloy of claim 1 wherein the aluminum concentration is about 0.1%.
Claim 5
Dependent Claim
28 words
A grain-refined palladium based dental alloy for porcelain-fused-to-metal restorations consisting by weight of essentially about 78.2% palladium, 9.5% cobalt, 4.0% indium, 8.0% tin, 0.1% aluminum, and 0.2% rhenium.
Claim 6
Dependent Claim
28 words
A grain-refined palladium based dental alloy for porcelain-fused-to-metal restorations consisting by weight of essentially about 78.2% palladium, 9.5% cobalt, 4.0% indium, 8.0% tin, 0.1% aluminum, and 0.2% rhenium.
References Cited (Backward Citations)
US2172512A
Cited
US2143217A
Cited
US2132116A
Cited
GB510640A
Cited
US3134671A
Cited
US3155467A
Cited
US3666540A
Cited
US3819366A
Cited
GB1365271A
Cited
US3928913A
Cited
US4123262A
Cited
US4124382A
Cited
US4179286A
Cited
US4205982A
Cited
US4179288A
Cited
US4261744A
Cited
US4319877A
Cited
US4266973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |