US3993491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroless plating
Assignee: Surface Technology Inc
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Filing: 1974-11-08
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Granted: 1976-11-23
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Expires: 1994-11-08
Abstract
Abstract Dielectric or non-conductive substrates are electrolessly plated by contacting the surface of the substrate with aqueous solutions containing stannous and copper ions, the solutions being alternatively combined with a single solution, followed by contacting the surface of the substrate with a reducing agent capable of reducing the valence state of the copper ions. Systems of solutions useful in the practice of the aforesaid process are also disclosed.
Inventors
- 👤 Nathan Feldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:31
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/2006; C23C18/2046; C23C18/2073; C23C18/208
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A solution useful in the priming of dielectric substrates in preparation for electroless plating comprising stannous and cuprous ions in aqueous media, said stannous to cuprous ions being present in said aqueous media in a molar ratio of at least 1:1.
Claim 2
Dependent Claim
41 words
A solution useful in the priming of dielectric substrates in preparation for electroless plating comprising stannous and cuprous ions in aqueous media, said stannous to cuprous ions being present in said aqueous media in a molar ratio of at least 1:1.
Claim 3
Dependent Claim
11 words
The solution of claim 1, further including a chemical stabilizing agent.
Claim 4
Dependent Claim
39 words
The solution of claim 1 wherein the concentration of said stannous ions is from about 0.12 to about 15.0 mols per liter and the concentration of said cuprous ions is from about 0.03 to about 1.0 mol per liter.
Claim 5
Dependent Claim
10 words
The solution of claim 1, wherein said solution is acidic.
Claim 6
Dependent Claim
34 words
The solution of claim 1, wherein said solution is prepared by mixing an aqueous solution of stannous ions with an aqueous solution of cupric ions the reduction of which results in said Cuprous ions.
Claim 7
Dependent Claim
20 words
The solution of claim 1, wherein said stannous and cuprous ions are present in a ratio of at least 3:1.
Claim 8
Dependent Claim
10 words
The solution of claim 1 further containing aged stannic ions.
References Cited (Backward Citations)
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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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |