Patent US3940319A successfully refreshed from Google Patents.
US3940319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of bright tin-nickel alloy
Assignee: Nasglo International Corp
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Filing: 1974-11-01
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Granted: 1976-02-24
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Expires: 1994-11-01
Abstract
Abstract An alloy of 0.001-0.30 weight percent nickel, the balance being essentially tin. The alloy provides a brightness, smoothness, solderability and electrical conductivity comparable to gold and is electrodeposited from an aqueous bath containing nickel sulfate, nickel fluoborate, nickel sulfamate, stannous sulfate or stannous fluoborate, benzene sulfonic acid, sulfuric acid, fluoboric acid or sulfamic acid providing a pH not higher than 1, and a brightener. The concentration of the tin salt in the bath is at least about 1 oz./gal. and the weight ratio of the nickel salt to the tin salt is at least 0.20 to 1. Substrates which may be coated with the alloy include iron, nickel, silver and copper, alloys of copper, and aluminum or zinc coated with nickel, silver or copper, or any combinations thereof.
Inventors
- 👤 Martin H. Pollack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:56
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/60; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3473
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
An aqueous electroplating bath capable of depositing an alloy consisting essentially of 0.001- 0.30 wt. % nickel and the balance tin, said bath consisting essentially of (a) a nickel salt selected from nickel sulfate, nickel fluoborate and nickel sulfamate, (b) a corresponding tin salt, (c) sulfuric acid, sulfamic acid, benzene sulfonic acid or fluoboric acid in an amount providing a pH of not higher than 1, and (d) an effective amount of a brightening agent, wherein the concentration of said tin salt is at least about 1 oz./gal. and the weight ratio of said nickel salt to said tin salt is at least 0.20 to 1.
Claim 2
Dependent Claim
106 words
An aqueous electroplating bath capable of depositing an alloy consisting essentially of 0.001- 0.30 wt. % nickel and the balance tin, said bath consisting essentially of (a) a nickel salt selected from nickel sulfate, nickel fluoborate and nickel sulfamate, (b) a corresponding tin salt, (c) sulfuric acid, sulfamic acid, benzene sulfonic acid or fluoboric acid in an amount providing a pH of not higher than 1, and (d) an effective amount of a brightening agent, wherein the concentration of said tin salt is at least about 1 oz./gal. and the weight ratio of said nickel salt to said tin salt is at least 0.20 to 1.
Claim 3
Dependent Claim
43 words
A bath as in claim 1 wherein the nickel salt is nickel sulfate, the tin salt is stannous sulfate, the acid is sulfuric acid, the brightener is N-benzyltrimethyl ammonium bromide or hydroxide, and the concentration of the stannous sulfate is about 1-7 oz./gal.
Claim 4
Dependent Claim
43 words
A bath as in claim 1 wherein the nickel salt is nickel fluoborate, the tin salt is stannous fluoborate, the acid is fluoboric acid, the brightener is N-benzyltrimethyl ammonium bromide or hydroxide, and the concentration of the stannous fluoborate is about 1-7 oz./gal.
Claim 5
Dependent Claim
36 words
A method of coating a metallic substrate so as to provide the properties of a gold coating thereon but without utilizing gold, which comprises electrolytically contacting the said substrate with the electroplating bath of claim 1.
Claim 6
Dependent Claim
19 words
A method as in claim 4 wherein an anode is utilized consisting essentially of nickel, platinum or platinum-plated titanium.
Claim 7
Dependent Claim
36 words
A method of coating a metallic substrate so as to provide the properties of a gold coating thereon but without utilizing gold, which comprises electrolytically contacting the said substrate with the electroplating bath of claim 2.
Claim 8
Dependent Claim
36 words
A method of coating a metallic substrate so as to provide the properties of a gold coating thereon but without utilizing gold, which comprises electrolytically contacting the said substrate with the electroplating bath of claim 3.
References Cited (Backward Citations)
US3002901A
Cited
US3141836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |