US4124382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental alloy for use in the adhesion of porcelain
Assignee: NEOLOY/DENTEX Inc
•
Filing: 1977-08-05
•
Granted: 1978-11-07
•
Expires: 1997-08-05
Abstract
Abstract The present invention provides a precious metal alloy consisting essentially of palladium and up to 25% tin, up to 2% iron, up to 1% aluminium, and up to 11/2% boron. In its preferred form the tin content is approximately 15%, the iron content is approximately 0.83%, the aluminum content is approximately 0.5%, and the boron content is approximately 0.17%. The alloy has a melting point of approximately 2650° F. It is especially adapted for low-fusing porcelain application, and well suited for dental use. It is an economy precious metal alloy as it contains no gold and no platinum. Between 1% and 5% of ruthenium may be added as a hardening element. 3% of ruthenium has been found to be ideal.
Inventors
- 👤 Emil M. Prosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:32
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
A precious dental metal alloy particularly adapted to have porcelain and like ceramics fused thereto consisting essentially of palladium, an effective amount up to 25% tin, a small percentage of each of the following elements up to 2% iron, up to 1% aluminum, and up to 11/2% boron and the balance palladium.
Claim 2
Dependent Claim
52 words
A precious dental metal alloy particularly adapted to have porcelain and like ceramics fused thereto consisting essentially of palladium, an effective amount up to 25% tin, a small percentage of each of the following elements up to 2% iron, up to 1% aluminum, and up to 11/2% boron and the balance palladium.
Claim 3
Dependent Claim
35 words
A precious dental metal alloy according to claim 1, wherein the tin content is approximately 15%, the iron content is approximately 0.83%, the aluminum content is approximately 0.5%, and the boron content is approximately 0.17%.
Claim 4
Dependent Claim
31 words
A precious dental metal alloy according to claim 2, having a melting point of approximately 2650° F., said alloy and porcelain having coefficients of expansion which are compatible with each other.
Claim 5
Dependent Claim
19 words
A precious dental metal alloy according to claim 1, containing in addition thereto between 1% and 5% of ruthenium.
Claim 6
Dependent Claim
16 words
A precious dental metal alloy according to claim 2, containing in addition thereto approximately 3% ruthenium.
Claim 7
Dependent Claim
41 words
A precious dental metal alloy according to claim 2, containing in addition thereto approximately 3% ruthenium, said alloy having a melting point of approximately 2650° F., and said alloy and porcelain having coefficients of expansion which are compatible with each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |