US4239538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic primer
Assignee: Surface Technology Inc
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Filing: 1976-03-30
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Granted: 1980-12-16
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Expires: 1996-03-30
Abstract
Abstract In the electroless plating of dielectric or non-conductive substrates by first priming the surface of the substrate with aqueous solutions containing stannous and copper ions, followed by developing the substrate with a reducing agent capable of reducing the valence state of the copper ions, the substrate is contacted with a linking agent for the stannous ion either prior to or concurrently with the priming step permitting the use of lower amounts of stannous and copper ions while achieving improved plating and improved primer usefulness.
Inventors
- 👤 Nathan Feldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:20
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
An improved catalytic primer composition for use in the electroless plating of non-metallic substrates comprised of the admixture, in aqueous media, of stannous ions, copper ions, and a linking agent capable of forming additional sites on said substrate for adsorption of stannous ions wherein stannous ions are in excess to copper ions and further wherein said linking agent is selected from the group consisting of phenol, cresol and mixtures thereof.
Claim 2
Dependent Claim
70 words
An improved catalytic primer composition for use in the electroless plating of non-metallic substrates comprised of the admixture, in aqueous media, of stannous ions, copper ions, and a linking agent capable of forming additional sites on said substrate for adsorption of stannous ions wherein stannous ions are in excess to copper ions and further wherein said linking agent is selected from the group consisting of phenol, cresol and mixtures thereof.
Claim 3
Dependent Claim
24 words
The primer composition of claim 1, wherein said linking agent is phenol, said phenol being present in an amount of at least 30 g/l.
Claim 4
Dependent Claim
25 words
The primer composition of claim 1, wherein said linking agent is cresol, said cresol being present in an amount of at least about 5 g/l.
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |