US4652465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a silver coated copper powder and conductive coating composition
Assignee: Nissan Chemical Corp
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Filing: 1985-05-07
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Granted: 1987-03-24
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Expires: 2005-05-07
Abstract
Abstract A process for producing a silver coated copper powder, characterized in that a metal silver is precipitated on the surface of a metal copper powder by means of a silver complex solution comprising a silver salt, an ammonium carbonate compound and ammonia water as essential components.
Inventors
- 👤 Noriaki Koto
- 👤 Joei Yukawa
- 👤 Takeo Moro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; B; B22; B22F; B22F1/00; B22F1/17; C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; H10; H10W; H10W20/00; H10W20/40; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A process for producing a silver coated copper powder, comprising the steps of: (i) forming a silver complex solution comprising an effective amount of a silver salt, ammonium carbonate or ammonium bicarbonate, and ammonia water; (ii) contacting a copper powder with said silver complex solution; and (iii) precipitating metal silver on the surface of said copper powder to produce said silver coated copper powder, wherein the molar ratio of said ammonium carbonate or ammonium bicarbonate to the ammonia in said ammonia water is within a range of 0.1-3 or 0.1-6, respectively.
Claim 2
Dependent Claim
91 words
A process for producing a silver coated copper powder, comprising the steps of: (i) forming a silver complex solution comprising an effective amount of a silver salt, ammonium carbonate or ammonium bicarbonate, and ammonia water; (ii) contacting a copper powder with said silver complex solution; and (iii) precipitating metal silver on the surface of said copper powder to produce said silver coated copper powder, wherein the molar ratio of said ammonium carbonate or ammonium bicarbonate to the ammonia in said ammonia water is within a range of 0.1-3 or 0.1-6, respectively.
Claim 3
Dependent Claim
26 words
The process according to claim 1, wherein the silver salt is selected from the group consiting of silver nitrate, silver carbonate, silver sulfate and silver oxide.
Claim 4
Dependent Claim
117 words
A conductive coating composition, comprising: 1 to 6 parts by weight of a silver coated copper powder, wherein said silver coated copper powder is produced by a process comprising the steps of: (i) forming a silver complex solution comprising an effective amount of a silver salt, ammonium carbonate or ammonium bicarbonate, and ammonia water; (ii) contacting a copper powder with said silver complex solution; and (iii) precipitating metal silver on the surface of said copper powder to produce said silver coated copper powder, wherein the molar ratio of said ammonium carbonate or ammonium bicarbonate to the ammonia in said ammonia water is within a range of 0.1-3 or 0.1-6, respectively, and 1part by weight of a binder.
Claim 5
Dependent Claim
117 words
A conductive coating composition, comprising: 1 to 6 parts by weight of a silver coated copper powder, wherein said silver coated copper powder is produced by a process comprising the steps of: (i) forming a silver complex solution comprising an effective amount of a silver salt, ammonium carbonate or ammonium bicarbonate, and ammonia water; (ii) contacting a copper powder with said silver complex solution; and (iii) precipitating metal silver on the surface of said copper powder to produce said silver coated copper powder, wherein the molar ratio of said ammonium carbonate or ammonium bicarbonate to the ammonia in said ammonia water is within a range of 0.1-3 or 0.1-6, respectively, and 1part by weight of a binder.
Claim 6
Dependent Claim
31 words
The conductive coating composition according to claim 3, which further contains an anti-settling additive in an amount of from 0.5 to 5% by weight relative to the silver coated copper powder.
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) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |