US4144141A
Expired / Lapsed
US
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Ammonia free palladium deposition using aminoacetic acid
Assignee: Siemens AG
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Filing: 1977-12-21
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Granted: 1979-03-13
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Expires: 1997-12-21
Abstract
Abstract An aqueous bath for galvanic deposition of palladium or palladium alloys and a process for using involving the use of aminoacetic acid as the sole complexing agent for palladium or palladium alloys in ammonium free, alkaline aqueous media.
Inventors
- 👤 Hans-Joachim Schuster
- 👤 Klaus-Dieter Heppner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/567; C25D3/50; C25D3/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
An aqueous ammonia-free bath for galvanic deposition of palladium metal containing palladium in the form of a diglycinate palladium II complex and aminoacetic acid as complexing agent, said bath being further characterized by containing: (A) from about 1 to 50 grams per liter of dissolved palladium, (B) from about 1 to 150 grams per liter of total added aminoacetic acid, and (C) sufficient dissolved alkali metal hydroxide to produce a solution pH ranging from about 7 to 12.
Claim 2
Dependent Claim
78 words
An aqueous ammonia-free bath for galvanic deposition of palladium metal containing palladium in the form of a diglycinate palladium II complex and aminoacetic acid as complexing agent, said bath being further characterized by containing: (A) from about 1 to 50 grams per liter of dissolved palladium, (B) from about 1 to 150 grams per liter of total added aminoacetic acid, and (C) sufficient dissolved alkali metal hydroxide to produce a solution pH ranging from about 7 to 12.
Claim 3
Dependent Claim
13 words
The bath of claim 1 wherein said alkali metal hydroxide is potassium hydroxide.
Claim 4
Dependent Claim
13 words
The bath of claim 1 wherein said alkali metal hydroxide is sodium hydroxide.
Claim 5
Dependent Claim
24 words
The bath of claim 1 wherein said diglycinate palladium II complex is represented by the formula Pd (OOCCH 2 NH 2 ) 2 .
References Cited (Backward Citations)
DE2506467A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |