Patent US4167240A successfully refreshed from Google Patents.
US4167240A
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Method of treating an electroplating solution comprising ions of gold and cyanide prior to electroplating and thermocompression bonding
Assignee: AT&T Inc
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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 16:42
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.
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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 |