US4735772A
Expired / Lapsed
US
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Palladium-cobalt alloys; manufacture of a root cap
Assignee: Elephant Edelmetaal BV
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Filing: 1986-11-25
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Granted: 1988-04-05
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Expires: 2006-11-25
Abstract
Abstract The invention relates to magnetic Pd-Co alloys for use in dental prostheses, in particular in root caps. The alloys contain, by weight, 40-60% Pd, 20-59% Co, 0-40% Ni, 0.1-5% Cr, 0.05-0.2% Re, 0.01-0.5% Fe, 0.5-3% Ga, 0-0.1% B, 0-5% Pt or Au, and the gallium may be replaced, in full or in part, by Sn, In, Zn or Mn.
Inventors
- 👤 Joseph M. van der Zel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:05
CPC Classifications
C; C22; C22C; C22C5/00; C22C5/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844; C22C19/00; C22C19/07; C22C30/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
Palladium-cobalt alloys consisting essentially of, by weight, 40-60% palladium, 20-59% cobalt, 0-40% nickel, 0.1-5% chromium, 0.5-0.2% rhenium, 0.01-0.5% iron 0.5-3% of at least one element selected from the group consisting of gallium, tin, indium, zinc and manganese, 0-0.1% boron, and 0-5% of at least one metal selected from the group consisting of platinum and gold.
Claim 2
Dependent Claim
55 words
Palladium-cobalt alloys consisting essentially of, by weight, 40-60% palladium, 20-59% cobalt, 0-40% nickel, 0.1-5% chromium, 0.5-0.2% rhenium, 0.01-0.5% iron 0.5-3% of at least one element selected from the group consisting of gallium, tin, indium, zinc and manganese, 0-0.1% boron, and 0-5% of at least one metal selected from the group consisting of platinum and gold.
Claim 3
Dependent Claim
12 words
Palladium-cobalt alloys as claimed in claim 1, characterized by not containing nickel.
Claim 4
Dependent Claim
13 words
Palladium-cobalt alloys as claimed in claim 1, containing 0.1-1.0% by weight of chromium.
Claim 5
Dependent Claim
13 words
Palladium-cobalt alloys as claimed in claim 1, containing 0.05-0.3% by weight of iron.
Claim 6
Dependent Claim
13 words
Palladium-cobalt alloys as claimed in claim 1, containing 0.005-0.1% by weight of boron.
Claim 7
Dependent Claim
13 words
Palladium-cobalt alloys as claimed in claim 1, containing 0.5-3% by weight of gallium.
Claim 8
Dependent Claim
13 words
Palladium-cobalt alloys as claimed in claim 1, containing 0.2-0.7% by weight of chromium.
Claim 9
Dependent Claim
13 words
Palladium-cobalt alloys as claimed in claim 1, containing 0.01-0.03% by weight of boron.
Claim 10
Dependent Claim
12 words
A root cap made from an alloy as claimed in claim 1.
Claim 11
Dependent Claim
12 words
A root cap made from an alloy as claimed in claim 2.
Claim 12
Dependent Claim
12 words
A root cap made from an alloy as claimed in claim 3.
Claim 13
Dependent Claim
12 words
A root cap made from an alloy as claimed in claim 4.
Claim 14
Dependent Claim
12 words
A root cap made from an alloy as claimed in claim 5.
Claim 15
Dependent Claim
12 words
A root cap made from an alloy as claimed in claim 6.
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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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |