US4299672A
Expired / Lapsed
US
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Bath and process for galvanic separation of palladium-nickel alloys
Assignee: Bayer Pharma AG
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Filing: 1975-12-29
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Granted: 1981-11-10
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Expires: 1995-12-29
Abstract
Abstract A bath and process for the electrodeposition of palladium-nickel alloys. The bath comprises sequestering agents for the metal ions therein. Examples of such sequestering agents are glycine, aminopropionic acid, glyoxylic acid, triethylene tetramine, beta-dihydroxyphenyl-alpha-aminobutyric acid, 5-keto-valerianic acid, acetone dicarboxylic acid, polyethylene polyimine and butanone-3-carboxylic acid. The bath has good stability and produces bright deposits.
Inventors
- 👤 Hans-Jurgen Ehrich
- 👤 Jorg Wahnelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:16
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/567
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
An aqueous ammoniacal bath for the galvanic deposition of a palladium-nickel alloy containing as its essential ingredients a palladium salt and a nickel salt in alloy-forming proportions, said palladium and nickel salts being present in the form of a complex with a complexing amount of at least one sequestering agent selected from the group consisting of glycine, aminopropionic acid, glyoxylic acid, triethylene tetramine, beta-dihydroxyphenyl-alpha-aminobutyric acid, 5-keto-valerianic acid, acetone dicarboxylic acid, polyethylene polyimine, and butanone-3-carboxylic acid.
Claim 2
Dependent Claim
75 words
An aqueous ammoniacal bath for the galvanic deposition of a palladium-nickel alloy containing as its essential ingredients a palladium salt and a nickel salt in alloy-forming proportions, said palladium and nickel salts being present in the form of a complex with a complexing amount of at least one sequestering agent selected from the group consisting of glycine, aminopropionic acid, glyoxylic acid, triethylene tetramine, beta-dihydroxyphenyl-alpha-aminobutyric acid, 5-keto-valerianic acid, acetone dicarboxylic acid, polyethylene polyimine, and butanone-3-carboxylic acid.
Claim 3
Dependent Claim
16 words
A bath according to claim 1 containing polyethylene polyimine and at least one additional sequestering compound.
Claim 4
Dependent Claim
45 words
In a method for the galvanic deposition of palladium-nickel alloys from an ammoniacal bath containing said metals according to claim 1, the improvement which comprises providing the metal in solution as a chelate compound comprising the metal and a sequestering agent according to claim 1.
Claim 5
Dependent Claim
37 words
The method of claim 3 wherein the metal is sequestered by polyethylene polyimine and another sequestering agent selected from the group consisting of glycine, aminopropionic acid, glyoxylic acid, triethylene tetramine, beta-dihydroxyphenyl-alpha-aminobutyric acid, 5-keto-valerianic acid and butanone-3-carboxylic acid.
References Cited (Backward Citations)
JPS4733177U
Cited
US3933602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |