Patent US4551302A successfully refreshed from Google Patents.
US4551302A
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Dental alloy based on palladium for the production of fixed and removable dental constructions
Assignee: Evonik Operations GmbH
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Filing: 1984-05-07
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Granted: 1985-11-05
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Expires: 2004-05-07
Abstract
Abstract Cast alloys which should be suited for both the production of removable dental construction (model casting technique) and also for permanent crowns and bridges with ceramic facing (firing technique) must combine good firing properties and good tensile strength and strain values. Alloys of this type consist of 65-85% Pd, 0-10% Au and/or 0-5% Pt, 0.1-10% Sn, 1-10% Ga, 1-12% Cu as well as 0.5-1.5 Ru and/or 0.05-0.7% Re.
Inventors
- 👤 Rudolph Wagner
- 👤 Harry Schiwiora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:35
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
A dental alloy suitable for the production of fixed and removal dental constructions consisting essentially of 65-80% palladium, 0.5-5% gold, 0.5-5% platinum, 3-8% copper, 4-8% gallium, 4-9% tin and 0.2-0.7% rhenium or 0.7-0.9% ruthenium.
Claim 2
Dependent Claim
34 words
A dental alloy suitable for the production of fixed and removal dental constructions consisting essentially of 65-80% palladium, 0.5-5% gold, 0.5-5% platinum, 3-8% copper, 4-8% gallium, 4-9% tin and 0.2-0.7% rhenium or 0.7-0.9% ruthenium.
Claim 3
Dependent Claim
30 words
A dental alloy according to claim 1 consisting essentially of 78-80% palladium, 0.8-2% gold, 0.8-2% platinum, 3-5% copper, 5-6% gallium, 6-9% tin and 0.4-0.6% rhenium or 0.7 to 0.9% ruthenium.
Claim 4
Dependent Claim
24 words
A dental alloy according to claim 2 consisting of 80% palladium, 1% gold, 1% platinum, 5% copper, 6% gallium, 6.5% tin and 0.5% rhenium.
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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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |