US4569825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Palladium dental alloy
Assignee: 3M Co
•
Filing: 1984-08-15
•
Granted: 1986-02-11
•
Expires: 2004-08-15
Abstract
Abstract A palladium alloy suitable for use with both high and low thermal expansion dental porcelains without causing discoloration of the porcelains. The alloy consists essentially of 70-90% palladium, 1-8% silver, 0-5% gold, 5-16% copper, 1-8% gallium, 0.01-0.8% silicon and 0.001-0.5% grain refiners.
Inventors
- 👤 Nitin N. Dvivedi
- 👤 Paul A. Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:37
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
An alloy consisting essentially of: ______________________________________
A. 70-90% palladium
B. 0-5% gold
C. 1-8% silver
D. 5-16% copper
E. 1-8% gallium
F. 0.01-0.8% silicon
G. 0.001-0.5% One or a combination
of grain refiners selected
from the group consisting
of osmium, iridium, rhenium,
rhodium and ruthenium.
______________________________________
Claim 2
Dependent Claim
46 words
An alloy consisting essentially of: ______________________________________
A. 70-90% palladium
B. 0-5% gold
C. 1-8% silver
D. 5-16% copper
E. 1-8% gallium
F. 0.01-0.8% silicon
G. 0.001-0.5% One or a combination
of grain refiners selected
from the group consisting
of osmium, iridium, rhenium,
rhodium and ruthenium.
______________________________________
Claim 3
Dependent Claim
57 words
An alloy adapted for use with high and low thermal expansion dental porcelains consisting essentially of: ______________________________________
A. 70-90% palladium
B. 0-5% gold
C. 1-8% silver
D. 5-16% copper
E. 1-8% gallium
F. 0.01-0.8% silicon
G. 0.001-0.5% One or a combination
of grain refiners selected
from the group consisting
of osmium, iridium, rhenium,
rhodium and ruthenium.
______________________________________
Claim 4
Dependent Claim
57 words
An alloy adapted for use with high and low thermal expansion dental porcelains consisting essentially of: ______________________________________
A. 70-90% palladium
B. 0-5% gold
C. 1-8% silver
D. 5-16% copper
E. 1-8% gallium
F. 0.01-0.8% silicon
G. 0.001-0.5% One or a combination
of grain refiners selected
from the group consisting
of osmium, iridium, rhenium,
rhodium and ruthenium.
______________________________________
Claim 5
Dependent Claim
14 words
The alloy of claim 2 wherein said palladium content ranges from 73% to 79%.
Claim 6
Dependent Claim
14 words
The alloy of claim 2 wherein said silver content ranges from 2% to 6%.
Claim 7
Dependent Claim
14 words
The alloy of claim 2 wherein said gold content ranges from 0% to 2%.
Claim 8
Dependent Claim
14 words
The alloy of claim 2 wherein said copper content ranges from 10% to 12%.
Claim 9
Dependent Claim
14 words
The alloy of claim 2 wherein said gallium content ranges from 6% to 8%.
Claim 10
Dependent Claim
14 words
The alloy of claim 2 wherein said silicon content ranges from 0.1% to 0.5%.
Claim 11
Dependent Claim
15 words
The alloy of claim 2 wherein said grain refiner content ranges from 0.05% to 0.3%.
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) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |