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US4493754A
Expired / Lapsed
US
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Electrodes for palladium electroplating process
Assignee: Nokia Bell Labs
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Filing: 1983-12-30
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Granted: 1985-01-15
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Expires: 2003-12-30
Abstract
Abstract A palladium electroplating process is described in which certain unique anode structures are used. These anodes have surfaces made of conducting ferrites such as nickel ferrite. Such anodes have low oxygen overvoltage, high chemical stability and minimum decomposition of complexing agent in the palladium electroplating bath.
Inventors
- 👤 Joseph A. Abys
- 👤 Yutaka Okinaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:44
CPC Classifications
C; C25; C25D; C25D17/00; C25D17/10; C25D3/00; C25D3/02; C25D3/50; C25D3/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A process for electroplating palladium comprising the step of passing current through an anode, plating solution and cathode, said plating solution comprising a source of palladium and complexing agent said complexing agent consisting essentially of at least one aliphatic polyamine with up to 20 carbon atoms characterized in that the surface of the anode comprises 8 ferrite.
Claim 2
Dependent Claim
57 words
A process for electroplating palladium comprising the step of passing current through an anode, plating solution and cathode, said plating solution comprising a source of palladium and complexing agent said complexing agent consisting essentially of at least one aliphatic polyamine with up to 20 carbon atoms characterized in that the surface of the anode comprises 8 ferrite.
Claim 3
Dependent Claim
25 words
The process of claim 1 in which the ferrite is selected from the group consisting of nickel ferrite, zinc ferrite, manganese ferrite and cobalt ferrite.
Claim 4
Dependent Claim
12 words
The process of claim 2 in which the ferrite is nickel ferrite.
Claim 5
Dependent Claim
20 words
The process of claim 1 in which the complexing agent is an aliphatic diamine with up to 10 carbon atoms.
Claim 6
Dependent Claim
25 words
The process of claim 4 in which the complexing agent is selected from the group consisting of 1,2-diaminopropane, 1,3-diaminopropane, diethylenetriamine, 1,4-diaminobutane, 1,6-diaminohexane, N,N'dimethyl-1,3-propanediamine and N,N,N',N'-tetramethyl-ethylenediamine.
Claim 7
Dependent Claim
12 words
The process of claim 5 in which the complexing agent is 1,3-diaminopropane.
Claim 8
Dependent Claim
22 words
The process of claim 1 in which the ferrite electrode is made by pressing and heating the appropriate oxides onto a substrate.
Claim 9
Dependent Claim
26 words
The process of claim 1 in which the ferrite is made by spraying a solution onto a heated substrate and heat treating to form the ferrite.
References Cited (Backward Citations)
US4401527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |