US4167240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating an electroplating solution comprising ions of gold and cyanide prior to electroplating and thermocompression bonding
Assignee: AT&T Inc
•
Filing: 1977-06-27
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Granted: 1979-09-11
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Expires: 1997-06-27
Abstract
Abstract A method of treating a solution comprising ions of gold and cyanide is disclosed. The method comprises treating the solution with metallic gold to precipitate therefrom metallic silver.
Inventors
- 👤 Theodore F. Schaaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:04
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/24; C; C25; C25D; C25D21/00; C25D21/16; C25D21/18; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
A method of treating a solution comprising dissolved species of gold, silver and cyanide which comprises exposing the solution to metallic gold to precipitate metallic silver therefrom.
Claim 2
Independent Claim
27 words
A method of treating a solution comprising dissolved species of gold, silver and cyanide which comprises exposing the solution to metallic gold to precipitate metallic silver therefrom.
Claim 3
Independent Claim
53 words
A method of removing a dissolved silver species from a solution comprising dissolved silver and gold species, which comprises: (a) adding a source of cyanide ions in an amount sufficient to form a silver cyanide complex; and (b) treating said silver cyanide complex containing solution with metallic gold to preciptate therefrom metallic silver.
Claim 4
Independent Claim
53 words
A method of removing a dissolved silver species from a solution comprising dissolved silver and gold species, which comprises: (a) adding a source of cyanide ions in an amount sufficient to form a silver cyanide complex; and (b) treating said silver cyanide complex containing solution with metallic gold to preciptate therefrom metallic silver.
Claim 5
Independent Claim
43 words
A method of rendering a gold cyanide solution, containing a soluble gold cyanide salt, capable of electrodepositing therefrom an essentially silver-metal-free gold deposit, which comprises: (a) treating the solution with metallic gold; and (b) removing essentially all free metals from said treated solution.
Claim 6
Independent Claim
43 words
A method of rendering a gold cyanide solution, containing a soluble gold cyanide salt, capable of electrodepositing therefrom an essentially silver-metal-free gold deposit, which comprises: (a) treating the solution with metallic gold; and (b) removing essentially all free metals from said treated solution.
Claim 7
Independent Claim
59 words
A method of forming an electroplated gold deposit on a surface having improved bondability thereto, which comprises: (a) treating an electroplating solution, containing a dissolved gold cyanide salt, with metallic gold; (b) removing free metallic species from said treated electroplating solution; and (c) electroplating the surface with said resultant metallic species removed solution to form the gold deposit thereon.
Claim 8
Independent Claim
59 words
A method of forming an electroplated gold deposit on a surface having improved bondability thereto, which comprises: (a) treating an electroplating solution, containing a dissolved gold cyanide salt, with metallic gold; (b) removing free metallic species from said treated electroplating solution; and (c) electroplating the surface with said resultant metallic species removed solution to form the gold deposit thereon.
Claim 9
Independent Claim
92 words
A method of improving a bond between a first surface and a second surface having an electroplated gold deposit thereon, which comprises: (a) treating a gold electroplating solution, containing a dissolved gold cyanide salt therein, with metallic gold to precipitate silver metal therefrom; (b) removing said precipitated silver metal to form an essentially silver species free electroplating solution; (c) treating the second surface with said silver species free electroplating solution to deposit an essentially silver metal free gold deposit thereon; and (d) bonding the first surface to said gold deposited second surface.
Claim 10
Independent Claim
92 words
A method of improving a bond between a first surface and a second surface having an electroplated gold deposit thereon, which comprises: (a) treating a gold electroplating solution, containing a dissolved gold cyanide salt therein, with metallic gold to precipitate silver metal therefrom; (b) removing said precipitated silver metal to form an essentially silver species free electroplating solution; (c) treating the second surface with said silver species free electroplating solution to deposit an essentially silver metal free gold deposit thereon; and (d) bonding the first surface to said gold deposited second surface.
Claim 11
Dependent Claim
45 words
The method of forming an electroplated gold deposit as recited in claim 4 wherein said step of treating said electroplating solution with metallic gold comprises contacting said solution with a fine particle size inert material having a film of metallic gold on the surface thereof.
Claim 12
Dependent Claim
52 words
The method of improving a bond between a first surface and a second surface as recited in claim 5 wherein said step of treating said gold electroplating solution with metallic gold comprises contacting said solution with a fine particle size inert material having a film of metallic gold on the surface thereof.
References Cited (Backward Citations)
US176813A
Cited
US1555615A
Cited
US1128313A
Cited
US1492282A
Cited
US2079597A
Cited
US2477443A
Cited
US2810638A
Cited
US3778252A
Cited
US3744995A
Cited
US3941870A
Cited
US3943069A
Cited
US3984598A
Cited
US3957506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |