Patent US4261744A successfully refreshed from Google Patents.
US4261744A
Expired / Lapsed
US
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Palladium-based dental alloy containing indium and tin
Assignee: Individual
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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 18:23
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.
References Cited (Backward Citations)
US2074996A
Cited
US2105312A
Cited
US2781580A
Cited
US3819366A
Cited
US3961420A
Cited
US3929475A
Cited
US3929474A
Cited
US3928913A
Cited
US4124382A
Cited
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 |