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US 4,285,991 AGranted
Method for producing printed circuits
AssigneeSchering Corporation
InventorsKlaus Gedrat, Hans-Jurgen Ehrich, Hartmut Mahlkow, Joachim Wolff
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AssigneeSchering Corporation
InventorsKlaus Gedrat, Hans-Jurgen Ehrich, Hartmut Mahlkow, Joachim Wolff
Estimating the term…
A method for producing printed circuits. An epoxy resin reinforced with glass fiber is used as basis material, coated with copper, drilled and activated. In one embodiment, the circuit diagram is applied after covering the non-desired regions with a resistance, by screen or photo printing. A nickel, cobalt, or nickel-cobalt layer is deposited onto the circuit, the circuit is covered with a solder prevention lacquer, then the eyes and bore holes are covered with copper. Alternatively, after pre-treatment and activation, all areas except the soldering eyes and bore holes are covered with resist, a nickel, cobalt or nickel-cobalt layer is applied, the circuit diagram is printed using a resist, and the eyes and bore hole are treated as above.
A method of producing printed circuits of the type wherein basis material is coated with copper which material is drilled, purified, activated, reduced and after-treated, wherein the circuit image is applied by printing the copper with a resist after covering of all areas not belonging to the circuit intended to be produced, wherein the improvement comprises covering the exposed copper of the so-pretreated basis material with a layer of metal selected from the group consisting of nickel, cobalt and nickel-cobalt through treatment with a chemical bath of said metal;
A method of producing printed circuits of the type wherein basis material is coated with copper which material is drilled, purified, activated, reduced and after-treated wherein the improvement comprises covering a portion of copper on the so-pretreated basis material with a layer of metal selected from the group consisting of nickel, cobalt and nickel-cobalt through treatment with a chemical bath of said metal;
Dependencies are inferred from the claim text.