US4013523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tin-gold electroplating bath and process
Assignee: Oxy Metal Industries Corp
•
Filing: 1975-12-24
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Granted: 1977-03-22
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Expires: 1995-12-24
Abstract
Abstract Disclosed is an aqueous electroplating bath suitable for plating a tin-gold alloy and a process of plating employing that bath. The bath contains gold as the auricyanide complex and tin as a stannic halide complex. The bath is operated at a pH value not in excess of 3. Where desired, the bath also contains a brightener. The electroplating bath is extremely stable and produces high quality electrodeposits.
Inventors
- 👤 Peter Stevens
- 👤 John Martin Deuber
- 👤 Kathleen Regina Rosikiewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:43
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/60; C25D3/62
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
An aqueous bath suitable for the electrodeposition of an alloy of tin and gold, comprising ______________________________________
gold as the auricyanide
1-30 g/l gold equiv.
tin as a stannic halide complex
1-150 g/l tin equiv.
______________________________________ wherein the halide is selected from the group consisting of fluoride, chloride and bromide, the bath exhibiting a pH value not in excess of 3.
Claim 2
Dependent Claim
60 words
An aqueous bath suitable for the electrodeposition of an alloy of tin and gold, comprising ______________________________________
gold as the auricyanide
1-30 g/l gold equiv.
tin as a stannic halide complex
1-150 g/l tin equiv.
______________________________________ wherein the halide is selected from the group consisting of fluoride, chloride and bromide, the bath exhibiting a pH value not in excess of 3.
Claim 3
Dependent Claim
19 words
The bath of claim 1 wherein the gold concentration is 1-16 g/l and the tin concentration is 10-40 g/l.
Claim 4
Dependent Claim
26 words
The bath of claim 1 containing sufficient quantity of the hydrohalogen acid corresponding to the halide of the stannic complex to attain the desired pH value.
Claim 5
Dependent Claim
15 words
The bath of claim 1 adjusted to a pH value not in excess of 1.
Claim 6
Dependent Claim
14 words
The bath of claim 1 additionally comprising at least 0.01 g/l of a surfactant.
Claim 7
Dependent Claim
10 words
The bath of claim 5 wherein said surfactant is non-ionic.
Claim 8
Dependent Claim
19 words
The bath of claim 5 wherein said surfactant is a polyethoxylated fatty alcohol containing 6 to 23 ethoxy groups.
Claim 9
Dependent Claim
14 words
The bath of claim 1 additionally containing at least 0.01 g/l of a brightener.
Claim 10
Dependent Claim
16 words
The bath of claim 1 additionally containing at least 0.01 g/l of a further alloying element.
Claim 11
Dependent Claim
23 words
A process of plating a tin-gold deposit on a conductive substrate comprising electrolyzing the solution of claim 1 with the substrate as cathode.
References Cited (Backward Citations)
US1905105A
Cited
US3598706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |