Patent US4269671A successfully refreshed from Google Patents.
US4269671A
Expired / Lapsed
US
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Electroplating of silver-palladium alloys and resulting product
Assignee: AT&T Inc
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Filing: 1979-11-05
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Granted: 1981-05-26
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Expires: 1999-11-05
Abstract
Abstract Palladium-silver alloy may be electroplated from lithium chloride bath solution to result in coatings useful for electrical contacts. Increased corrosion resistance relative to wrought contacts of the same composition permit relatively large amounts of silver.
Inventors
- 👤 Uri Cohen
- 👤 Richard Sard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:49
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/567; C25D3/64; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12875; Y10T428/12896
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
147 words
Procedure for fabrication of an article, said procedure including electroplating at least a region of the said article with an alloy at least 90 percent by weight of which contains at least 30 weight percent silver, remainder palladium in accordance with which the region of the article to be plated is biased cathodically relative to an anode, with both the said region and the anode wetted by liquid electroplating bath to form a continuous path for ionic transfer between the said article and the said anode, characterized in that the said bath may be considered as consisting primarily of an aqueous solution of at least one alkali metal or alkaline earth metal halide together with palladium halide, any other platinum group halide/s and silver halide and in which the article to be plated is protected from chemical attack by the said bath by a noble metal surface.
Claim 2
Dependent Claim
147 words
Procedure for fabrication of an article, said procedure including electroplating at least a region of the said article with an alloy at least 90 percent by weight of which contains at least 30 weight percent silver, remainder palladium in accordance with which the region of the article to be plated is biased cathodically relative to an anode, with both the said region and the anode wetted by liquid electroplating bath to form a continuous path for ionic transfer between the said article and the said anode, characterized in that the said bath may be considered as consisting primarily of an aqueous solution of at least one alkali metal or alkaline earth metal halide together with palladium halide, any other platinum group halide/s and silver halide and in which the article to be plated is protected from chemical attack by the said bath by a noble metal surface.
Claim 3
Dependent Claim
20 words
Process of claim 1 in which the said noble metal surface is a deposited layer on a nonnoble metal surface.
Claim 4
Dependent Claim
14 words
Process of claim 2 in which the said deposited layer consists essentially of silver.
Claim 5
Dependent Claim
13 words
Process of claim 2 in which the said deposited layer is soft gold.
Claim 6
Dependent Claim
22 words
Process of claim 4 in which the deposited layer is of a thickness of from about 0.2 μm to about 0.4 μm.
Claim 7
Dependent Claim
34 words
Process of claim 1 in which the said alloy contains at least 50 parts by weight of silver based on 100 parts by weight of silver plus palladium plus any other platinum group elements.
Claim 8
Dependent Claim
22 words
Process of claim 6 in which the said alloy contains at least 60 parts by weight of silver on the same basis.
Claim 9
Dependent Claim
31 words
Process of claim 1 in which the said halide is chloride and in which the pH of the said bath is within the range of from about 0.3 to about 1.0.
Claim 10
Dependent Claim
20 words
Process of claim 8 in which the said alkali metal or alkaline earth metal halide consists essentially of lithium chloride.
Claim 11
Dependent Claim
14 words
Process of claim 1 in which the said region is an electrical contact region.
Claim 12
Dependent Claim
38 words
Process of claim 1 in which the bath is agitated sufficiently to result in turbulence in the vicinity of the said region and in which the plating rate is maintained at a level of at least 5 μm/min.
Claim 13
Dependent Claim
20 words
Process of claim 11 in which the plating rate is maintained at a level of at least about 10 μm/min.
Claim 14
Dependent Claim
10 words
Product produced in accordance with the process of claim 1.
References Cited (Backward Citations)
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Cited
US4203810A
Cited
US3711383A
Cited
US3933602A
Cited
US4001093A
Cited
US4177114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |