Patent US3933602A successfully refreshed from Google Patents.
US3933602A
Expired / Lapsed
US
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Palladium electroplating bath, process, and preparation
Assignee: Oxy Metal Industries Corp
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Filing: 1974-04-19
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Granted: 1976-01-20
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Expires: 1994-04-19
Abstract
Abstract Disclosed is an aqueous plating bath suitable for obtaining electrodeposits of palladium and its alloys. The bath is substantially free of cyanide, nitrate and nitrite, and comprises sulfite ion, palladium in the form of a tetra-coordinated complex with palladium in the +2 oxidation state, an atomic ratio of halide to palladium not in excess of 10, and exhibits a pH of from 7 to 12.
Inventors
- 👤 Rene Henzi
- 👤 Andre Meyer
- 👤 Pierre Lalanne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:41
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50; C25D3/56; C25D3/567
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
An aqueous electroplating bath suitable for obtaining deposits of palladium and its alloys wherein the palladium present consists essentially of a dissolved palladium complex of the formula Pd(SO 3 ) (NH 3 ) 3 in an amount from 1 g/l to 50 g/l of palladium, said bath exhibiting a pH of from 7 to 12.
Claim 2
Dependent Claim
55 words
An aqueous electroplating bath suitable for obtaining deposits of palladium and its alloys wherein the palladium present consists essentially of a dissolved palladium complex of the formula Pd(SO 3 ) (NH 3 ) 3 in an amount from 1 g/l to 50 g/l of palladium, said bath exhibiting a pH of from 7 to 12.
Claim 3
Dependent Claim
18 words
The bath of claim 1 containing an atomic ratio of halide to palladium not in excess of 10.
Claim 4
Dependent Claim
48 words
The bath of claim 2 additionally comprising, in electrodepositable form, at least 1 mg/l of at least one metal selected from the group consisting of Cd, Cr, Co, Cu, Ga, Au, In, Fe, Pb, Mo, Ni, Ag, Sn, Zn, As, Sb, Bi, Pt, Rh, Ru, Ir and Os.
Claim 5
Dependent Claim
30 words
The bath of claim 1 containing between 1 g/l and 20° g/l of buffering or conductive salts selected from the alkali metal, earth-alkali metal and ammonium organic or mineral salts.
Claim 6
Dependent Claim
48 words
The bath of claim 1 additionally comprising an organo-nitrogen, -sulfur, or -phosphorus compound selected from the group consisting of polyamines, aryl and alkyl sulfonates, aryl and alkyl phosphonates, the alkali metal and ammonium salts and the --OH, --COOH, --CHO, and substituted or unsubstituted amino derivatives of the foregoing.
Claim 7
Dependent Claim
28 words
A method of obtaining a deposit of palladium or an alloy thereof on a conductive surface comprising electrolyzing the bath of claim 1 with said surface as cathode.
Claim 8
Dependent Claim
54 words
In a method for replenishing the palladium content of a halide containing aqueous bath for the electrodeposition of palladium or its alloys, the improvement comprising maintaining the atomic ratio of halide:palladium at a value not in excess of 10 by adding the palladium as the complex Pd(SO 3 ) (NH 3 ) 3 .
Claim 9
Dependent Claim
54 words
In a method for replenishing the palladium content of a halide containing aqueous bath for the electrodeposition of palladium or its alloys, the improvement comprising maintaining the atomic ratio of halide:palladium at a value not in excess of 10 by adding the palladium as the complex Pd(SO 3 ) (NH 3 ) 3 .
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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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |