US4933010A
Expired / Lapsed
US
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Sensitizing activator composition for chemical plating
Assignee: HARNDEN ERIC F D/B/A/ SOLUTION TECHNOLOGY SYSTEMS
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Filing: 1988-09-02
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Granted: 1990-06-12
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Expires: 2008-09-02
Abstract
Abstract Disclosed is a sensitizing activator for chemical plating operations, that uniformly and efficiently deposits a substance capable of catalytically depositing a plating metal from a plating solution, such as colloidal palladium, on the surface of a material to be plated. The activator includes stannous chloride and palladium chloride colloidally dispersed in a dilute solution of sulfuric acid and sodium chloride. The activator advantageously avoids corrosion of the black oxide that is formed on the inner copper foil of copper-clad laminates.
Inventors
- 👤 Kiyoshi Okabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:23
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; H; H05; H05K; H05K3/00; H05K3/40; H05K3/42; H05K3/422; H05K3/425; H05K3/427
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
27 words
A concentrated, hydrochloric acid free sensitizing activator for chemical plating, which comprises stannous chloride, and palladium chloride colloidally dispersed in an aqueous solution of saturated sodium chloride.
Claim 2
Dependent Claim
27 words
A concentrated, hydrochloric acid free sensitizing activator for chemical plating, which comprises stannous chloride, and palladium chloride colloidally dispersed in an aqueous solution of saturated sodium chloride.
Claim 3
Dependent Claim
12 words
The activator of claim 1 further comprising an effective concentration of vanillin.
Claim 4
Dependent Claim
19 words
The activator of claim 1 wherein the stannous chloride is in a concentration of about 500 grams per liter.
Claim 5
Dependent Claim
19 words
The activator of claim 1 wherein the palladium chloride is in a concentration of about 10 grams per liter.
Claim 6
Dependent Claim
19 words
The activator of claim 1 wherein the sodium chloride is in a concentration of about 280 grams per liter.
Claim 7
Dependent Claim
16 words
The activator of claim 2 wherein the concentration of vanillin is about 1.5 grams per liter.
Claim 8
Dependent Claim
60 words
A concentrated, hydrochloric acid free sensitizing activator for chemical plating, comprising stannous chloride and palladium chloride colloidally dispersed in an aqueous solution of saturated sodium chloride and sulfuric acid, the stannous chloride and the palladium chloride having weight per unit volume concentrations in the ratio of from about 25 to about 100 for stannous chloride per unit of palladium chloride.
Claim 9
Dependent Claim
60 words
A concentrated, hydrochloric acid free sensitizing activator for chemical plating, comprising stannous chloride and palladium chloride colloidally dispersed in an aqueous solution of saturated sodium chloride and sulfuric acid, the stannous chloride and the palladium chloride having weight per unit volume concentrations in the ratio of from about 25 to about 100 for stannous chloride per unit of palladium chloride.
Claim 10
Dependent Claim
25 words
The activator of claim 7 diluted in a volumetric concentration of about 1 percent in an aqueous solution of sodium chloride and dilute sulfuric acid.
Claim 11
Dependent Claim
19 words
The activator of claim 7 wherein the stannous chloride is in a concentration of about 500 grams per liter.
Claim 12
Dependent Claim
23 words
The activator of claim 7 wherein the palladium chloride is in a concentration of from about 10 to about 20 grams per liter.
Claim 13
Dependent Claim
19 words
The activator of claim 7 wherein the sodium chloride is in a concentration of about 280 grams per liter.
Claim 14
Dependent Claim
24 words
The activator of claim 7 further comprising vanillin in a weight concentration of from about 0.075 to about 0.3 per unit of palladium chloride.
Claim 15
Dependent Claim
19 words
The activator of claim 12 wherein the weight concentration of vanillin is about 0.15 per unit of palladium chloride.
Claim 16
Dependent Claim
35 words
The activator of claim 8 wherein the sodium chloride is in a concentration of about 280 grams per liter and the sulfuric acid is in a concentration of between about 0.05 and about 0.1 percent.
Claim 17
Dependent Claim
31 words
The activator of claim 8 wherein the sodium chloride is in a concentration of about 50 grams per liter and the sulfuric acid is in a concentration of about 5 percent.
Claim 18
Dependent Claim
42 words
A method for chemically plating a substrate, comprising the steps of: (a) dipping the substrate into the sensitizing activator of claim 8; (b) rinsing the substrate; and (c) dipping the substrate into a chemical plating bath containing the metal to be plated.
Claim 19
Dependent Claim
44 words
The method of claim 16 further comprising, following the step of dipping the board into the sensitizing activator, the further step of dipping the substrate in an aqueous solution of sulfuric acid in a volumetric concentration of approximately 10 percent for accelerating the plating.
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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |