US3772167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of metals
Assignee: Individual
•
Filing: 1971-08-27
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Granted: 1973-11-13
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Expires: 1991-08-27
Abstract
Abstract The specification discloses an improved method and an improved electrolyte solution for providing a metal coating on a metallic substrate. The metal coatings are provided by electrodeposition from solutions comprising water, a dipolar organic solvent, metal ions, halide ions, and ammonium ions. Specific dipolar organic solvents disclosed include dimethylsulphoxide, dimethylacetamide, tetrahydrothiophen dioxide, dimethylformamide, propylene carbonate, tetramethylurea and hexamethyl phosphormamide.
Inventors
- 👤 N Bharucha
- 👤 J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:10
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/04; C25D3/06; C25D3/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
An electrolyte solution according to claim 1 containing at least 0.2M ammonium ions, and a complexing agent which consists essentially of said organic dipolar aprotic solvent.
Claim 2
Dependent Claim
22 words
An electrolyte solution according to claim 2 wherein the concentration of chromium ions is from about 0.8 M to about 1.3 M.
Claim 3
Dependent Claim
21 words
An electrolyte solution according to claim 2 wherein the concentration of nickel ions is from about 0.8 M to 1.2 M.
Claim 4
Dependent Claim
32 words
An electrolyte solution according to claim 2 wherein the concentration of ammonium ions is at least 0.2 M and the concentration of water is from about 20 percent to about 60 percent.
Claim 5
Dependent Claim
19 words
An electrolyte solution according to claim 2 containing boric acid in a concentration of at least about 0.1 M.
Claim 6
Dependent Claim
15 words
An electrolyte solution according to claim 1 wherein said dipolar aprotic organic solvent is dimethylformamide.
Claim 7
Dependent Claim
14 words
An electrolyte solution according to claim 7 containing at least 0.8 M sodium chloride.
Claim 8
Independent Claim
144 words
A method for electrodepositing a chromium-nickel alloy on a substrate which comprises immersing said substrate in an electrolyte solution comprising at least about 40 percent of a dipolar aprotic organic solvent selected from the group consisting of dimethylformamide, dimethylsulphoxide, dimethylacetamide, tetrahydrothiophen dioxide, propylene carbonate, tetramethyl urea, and hexamethyl phosphoramide, trivalent chromium ions in a concentration of at least about 0.8M, nickel ions in a concentration of at least about 0.05M, ammonium ions in a concentration of at least 0.2M, from about 20 percent to about 60 percent water, and a complexing agent which consists essentially of said dipolar aprotic solvent, the pH of the solution being from about 1 to about 3.5, said solution being free of other complexing agents, and passing an electric current through said solution thereby to deposit said metal ions on a substrate in the form of a metallic coating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |