Patent US5620583A successfully refreshed from Google Patents.
US5620583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platinum plating bath
Assignee: Umicore Galvanotechnik GmbH
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Filing: 1996-03-27
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Granted: 1997-04-15
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Expires: 2016-03-27
Abstract
Abstract Crack-free, bright platinum layers with thicknesses of more than 100 μm are obtained from electroplating baths which contain 5 to 30 g/l platinum as amminesulphamato complex and 20 to 400 g of a strong acid if the content of free amidosulphuric acid amounts to less than 5 g/l.
Inventors
- 👤 Werner Kuhn
- 👤 Wolfgang Zilske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:27
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
A platinum electroplating bath, for depositing thick layers of platinum, comprising 5 to 30 g/l platinum ions as amminesulphamato complex, 20 to 400 g/l of an acid of sufficient strength to create a pH value less than 1 in said electroplating bath, and at most 5 g/l free amidosulphuric acid.
Claim 2
Dependent Claim
50 words
A platinum electroplating bath, for depositing thick layers of platinum, comprising 5 to 30 g/l platinum ions as amminesulphamato complex, 20 to 400 g/l of an acid of sufficient strength to create a pH value less than 1 in said electroplating bath, and at most 5 g/l free amidosulphuric acid.
Claim 3
Dependent Claim
27 words
The platinum electroplating bath according to claim 1, wherein said acid is a member selected from the group consisting of sulphuric acid, methanesulphamic acid and perchloric acid.
Claim 4
Dependent Claim
22 words
The platinum electroplating bath according to claim 2, further comprising 0.01 to 0.2 g/l of a fluorine-based surfactant as a wetting agent.
Claim 5
Dependent Claim
22 words
The platinum electroplating bath according to claim 1, further comprising 0.01 to 0.2 g/l of a fluorine-based surfactant as a wetting agent.
Claim 6
Dependent Claim
30 words
The platinum electroplating bath according to claim 1, wherein said amminesulphamato complex is a product resulting from a reaction of 1 mol diamminedinitritoplatinum(II) with 4 to 6 mol amidosulphuric acid.
Claim 7
Dependent Claim
25 words
The platinum electroplating bath according to claim 5, wherein said diamminedinitritoplatinum(II) is reacted with said amidosulphuric acid in equivalent quantities to form said amminesulphamato complex.
Claim 8
Independent Claim
65 words
A method of making a platinum electroplating bath comprising adding a platinum amminesulphamato complex solution to an aqueous bath of an acid of sufficient strength to create a pH value of less than 1 in said bath, optionally adding a fluorine-based surfactant, and adding water so the pH of said bath is less than 1; said bath contains at most 5 g/l free amidosulphuric acid.
Claim 9
Independent Claim
65 words
A method of making a platinum electroplating bath comprising adding a platinum amminesulphamato complex solution to an aqueous bath of an acid of sufficient strength to create a pH value of less than 1 in said bath, optionally adding a fluorine-based surfactant, and adding water so the pH of said bath is less than 1; said bath contains at most 5 g/l free amidosulphuric acid.
Claim 10
Independent Claim
100 words
A method of electroplatingly depositing platinum on an article comprising placing said article in a platinum electroplating bath comprising 5 to 30 g/l platinum ions as amminesulphamato complex, 20 to 400 g/l of an acid sufficient to create a pH value less than 1 in said electroplating bath, and at most 5 g/l free amidosulphuric acid, subjecting said bath to a temperature of between 60° and 90° C. and operating said electroplating bath at an electric current density of 1 to 4 A/dm 2 for a sufficient period of time to deposit a bright layer of platinum on said article.
Claim 11
Independent Claim
100 words
A method of electroplatingly depositing platinum on an article comprising placing said article in a platinum electroplating bath comprising 5 to 30 g/l platinum ions as amminesulphamato complex, 20 to 400 g/l of an acid sufficient to create a pH value less than 1 in said electroplating bath, and at most 5 g/l free amidosulphuric acid, subjecting said bath to a temperature of between 60° and 90° C. and operating said electroplating bath at an electric current density of 1 to 4 A/dm 2 for a sufficient period of time to deposit a bright layer of platinum on said article.
Claim 12
Dependent Claim
16 words
The method according to claim 8 further comprising dissolving said article to obtain a platinum foil.
Claim 13
Dependent Claim
25 words
The method according to claim 8 wherein said period of time is sufficient to deposit the layer of platinum of at least 100 μm thickness.
References Cited (Backward Citations)
US2984604A
Cited
US5102509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-14 | 2000-10-14 | 2001-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-14 | 2004-10-14 | 2005-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-14 | 2008-10-14 | 2009-04-15 | $7700.00 | Window Closed / Lapsed |