Patent US4911798A successfully refreshed from Google Patents.
US4911798A
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US
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Palladium alloy plating process
Assignee: Nokia of America Corp
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Filing: 1988-12-20
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Granted: 1990-03-27
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Expires: 2008-12-20
Abstract
Abstract A process is described for electroplating palladium and palladium alloys. The process involves the use of an alkyl hydroxyamine as complexing agent and is particularly good for palladium alloys such as palladium-nickel and palladium-cobalt.
Inventors
- 👤 Joseph A. Abys
- 👤 Virginia T. Eckert
- 👤 Catherine Wolowodiuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:31
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/24; H05K3/244; C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/52; C25D3/56; C25D3/567
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A process for electroplating a metallic substance, said metallic substance comprising palladium, comprising the step of passing current through a cathode, an electroplating bath and an anode with cathode potential great enough to electroplate palladium, said electroplating bath having a conductivity greater than 10 -3 mho-cm and a pH greater than 5 characterized in that the electroplating bath comprises palladium complex ion in which the complexing agent comprises alkylhydroxy amines selected from the group consisting of bis-(hydroxymethyl)aminomethane, tris-(hydroxymethyl)aminomethane, bis-(hydroxyethyl)aminomethane and tris-(hydroxyethyl)aminomethane.
Claim 2
Dependent Claim
81 words
A process for electroplating a metallic substance, said metallic substance comprising palladium, comprising the step of passing current through a cathode, an electroplating bath and an anode with cathode potential great enough to electroplate palladium, said electroplating bath having a conductivity greater than 10 -3 mho-cm and a pH greater than 5 characterized in that the electroplating bath comprises palladium complex ion in which the complexing agent comprises alkylhydroxy amines selected from the group consisting of bis-(hydroxymethyl)aminomethane, tris-(hydroxymethyl)aminomethane, bis-(hydroxyethyl)aminomethane and tris-(hydroxyethyl)aminomethane.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the metallic substance consists essentially of palladium.
Claim 4
Dependent Claim
37 words
The process of claim 1 in which the metallic substance comprises, in addition to palladium, at least one metal selected from the group consisting of silver, copper, nickel, cobalt, gold, chromium, manganese, ruthenium, rhodium, platinum and iridium.
Claim 5
Dependent Claim
30 words
The process of claim 3 in which the metallic substance comprises, in addition to palladium, at least one metal selected from the group consisting of copper, nickel, cobalt and silver.
Claim 6
Dependent Claim
28 words
The process of claim 4 in which the metallic substance comprises, in addition to palladium, at least one metal selected from the group consisting of nickel and cobalt.
Claim 7
Dependent Claim
12 words
The process of claim 1 in which the complexing agent comprises tris-(hydroxymethyl)aminomethane.
Claim 8
Dependent Claim
23 words
The process of claim 1, in which the palladium concentration in the bath solution in terms of palladium is from 0.0001M to saturation.
Claim 9
Dependent Claim
16 words
The process of claim 7 in which the concentration of palladium varies from 0.01M to 1.0M.
Claim 10
Dependent Claim
23 words
The process of claim 1 in which the mole percent of palladium replaced by alloying metal is from 10 to 90 mole percent.
Claim 11
Dependent Claim
23 words
The process of claim 9 in which the mole percent of palladium replaced by alloying metal is from 20 to 50 mole percent.
Claim 12
Dependent Claim
29 words
The process of claim 1 in which the concentration of complexing agent is from 0.01 to 10 times the mole amount of palladium plus alloy metal in the bath.
References Cited (Backward Citations)
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |