US4261744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Palladium-based dental alloy containing indium and tin
Assignee: Individual
•
Filing: 1979-10-10
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Granted: 1981-04-14
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Expires: 1999-10-10
Abstract
Abstract A non-discoloring palladium-based alloy, free of silver or gold, suitable for fusion to dental porcelain compositions consists essentially of 75-85% by weight of Pd, 5-10% by weight of In, 5-10.5% by weight of Sn, up to 7.5% by weight of Co, Cr or Ni and up to 0.25% by weight of Si.
Inventors
- 👤 Ben K. Boyajian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:01
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
33 words
A gold-free, silver-free alloy consisting essentially of 75-85% by weight of Pd, 5-10.5% by weight of In, 5-10.5% by weight of Sn, 1.0-7.5% by weight of Co and 0.1-0.25% by weight of Si.
Claim 2
Dependent Claim
33 words
A gold-free, silver-free alloy consisting essentially of 75-85% by weight of Pd, 5-10.5% by weight of In, 5-10.5% by weight of Sn, 1.0-7.5% by weight of Co and 0.1-0.25% by weight of Si.
Claim 3
Dependent Claim
34 words
The alloy of claim 1, consisting essentially of 77-82% by weight of Pd, 5-10.5% by weight of In, 5-10.5% by weight of Sn, 1.0-7.5% by weight of Co and 0.1-0.25% by weight of Si.
Claim 4
Dependent Claim
14 words
The alloy of claim 1, which contains at least 4.0% by weight of Co.
Claim 5
Dependent Claim
34 words
The alloy of claim 1, consisting essentially of 77-82% by weight of Pd, 7.5-10.5% by weight of In, 7.0-10.5% by weight of Sn, 1.0-7.5% by weight of Co and 0.1-0.25% by weight of Si.
Claim 6
Dependent Claim
34 words
The alloy of claim 1, consisting essentially of 77-82% by weight of Pd, 7.5-10.5% by weight of In, 7.0-10.0% by weight of Sn, 1.0-7.5% by weight of Co and 0.1-0.25% by weight of Si.
Claim 7
Dependent Claim
34 words
The alloy of claim 1, consisting essentially of 77-82% by weight of Pd, 7.5-10.5% by weight of In, 7.0-10.0% by weight of Sn, 4.0-7.5% by weight of Co and 0.1-0.25% by weight of Si.
Claim 8
Dependent Claim
40 words
A dental prosthesis comprising a cast palladium alloy base in the shape of a tooth, the palladium alloy being that of claim 5, and a porcelain coating firmly adhered to at least a portion of the cast palladium alloy base.
Claim 9
Dependent Claim
57 words
The dental prosthesis of claim 7, wherein the cast alloy consists essentially of 77-82% by weight of Pd, 7.5-10.5% by weight of In, 7.0-10.0% by weight of Sn, 4.0-7.5% by weight of Co and 0.1-0.25% by weight of Si and the porcelain coating is firmly adhered to the cast palladium alloy base by chemical and diffusion bonding.
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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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |