Patent US2191765A successfully refreshed from Google Patents.
US3963841A
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Catalytic surface preparation for electroless plating
Assignee: International Business Machines Corp
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Filing: 1975-01-06
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Granted: 1976-06-15
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Expires: 1995-01-06
Abstract
Abstract A catalyst solution for making surfaces receptive to the deposition of adherent electroless metal layers includes a complex of a precious metal salt with dimethyl sulfoxide such as, for example, Pd Cl 2 . 2(CH 3 ) 2 SO together with a group IV metal salt such as, for example, stannous chloride. A process for rendering surfaces, such as glass, receptive to adherent electroless metal layers using the catalyst solution is also provided.
Inventors
- 👤 Morris Anschel
- 👤 Stephen Anthony Shear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:01
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A catalyst solution for making surfaces receptive to electroless deposition of adherent metal layers consisting essentially of: a complex of a salt of a precious metal of period 5 and 6 of group VIII of the periodic table with dimethyl sulfoxide; at least a stoichiometric amount based on the group VIII salt of a group IV metal salt capable of reducing the precious metal ion to an elemental form, the group IV metal being selected from the group consisting of tin, titanium and germanium; and an organic solvent.
Claim 2
Dependent Claim
88 words
A catalyst solution for making surfaces receptive to electroless deposition of adherent metal layers consisting essentially of: a complex of a salt of a precious metal of period 5 and 6 of group VIII of the periodic table with dimethyl sulfoxide; at least a stoichiometric amount based on the group VIII salt of a group IV metal salt capable of reducing the precious metal ion to an elemental form, the group IV metal being selected from the group consisting of tin, titanium and germanium; and an organic solvent.
Claim 3
Dependent Claim
15 words
The catalyst solution of claim 1 in which the precious metal salt is palladium chloride.
Claim 4
Dependent Claim
15 words
The catalyst solution of claim 1 in which the precious metal salt is palladium nitrate.
Claim 5
Dependent Claim
15 words
The catalyst solution of claim 1 in which the precious metal salt is chloroplatinic acid.
Claim 6
Dependent Claim
16 words
The catalyst solution of claim 1 in which the group IV salt is a stannous salt.
Claim 7
Dependent Claim
14 words
The catalyst solution of claim 5 in which the stannous salt is stannous chloride.
Claim 8
Dependent Claim
24 words
The catalyst solution of claim 1 in which a sufficient excess of dimethyl sulfoxide to solublize the complex is present in the catalyst solution.
Claim 9
Dependent Claim
30 words
The catalyst solution according to claim 1 in which the precious metal salt is present in an amount of from about 0.01 to 10 grams per liter of catalyst solution.
Claim 10
Dependent Claim
106 words
A process for electrolessly plating a metal onto a substrate comprising: contacting the substrate with a catalyst solution consisting essentially of a complex of a salt of a precious metal of period 5 and 6 of group VIII of the periodic table with dimethyl sulfoxide together with a group IV metal salt capable of reducing the precious metal ion to an elemental form contained in an organic solvent; said group IV metal being selected from the group consisting of tin, titanium and germanium; washing the substrate; and contacting the substrate with an electroless metal plating bath to form an adherent layer of metal on the substrate.
Claim 11
Dependent Claim
106 words
A process for electrolessly plating a metal onto a substrate comprising: contacting the substrate with a catalyst solution consisting essentially of a complex of a salt of a precious metal of period 5 and 6 of group VIII of the periodic table with dimethyl sulfoxide together with a group IV metal salt capable of reducing the precious metal ion to an elemental form contained in an organic solvent; said group IV metal being selected from the group consisting of tin, titanium and germanium; washing the substrate; and contacting the substrate with an electroless metal plating bath to form an adherent layer of metal on the substrate.
Claim 12
Dependent Claim
35 words
The process of claim 8 including the step of baking the substrate at a temperature of from about 150° to 200°C after washing the substrate and prior to immersing it in the electroless plating bath.
Claim 13
Dependent Claim
11 words
The process of claim 10 wherein the substrate is a glass.
Claim 14
Dependent Claim
23 words
The process of claim 9 in which a sufficient excess of dimethyl sulfoxide to solublize the complex is present in the catalyst solution.
Claim 15
Dependent Claim
18 words
The process of claim 12 in which the complex is PdCl 2 .sup.. 2(CH 3 ) 2 SO.
References Cited (Backward Citations)
US3460952A
Cited
US3682671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |