Electroplating process and composition
First Claim
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1. A process for preparing an article for electroplating, said process comprising the steps of providing an article having metallic surfaces and surfaces that are electrically nonconductive;
- coating surfaces of said article with a non-metallic, semiconductive, liquid permeable layer;
contacting said article with an etchant capable of dissolving said metallic surfaces without removing said semiconductive layer for a time sufficient to dissolve at least the top layer of said metallic surfaces; and
contacting said article with an aqueous spray at a spray pressure of at least 100 pounds per square inch.
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Accused Products
Abstract
A process of electroplating comprising formation of a semiconductive coating over an article having both metallic and non-metallic portions, dissolving the metal surface underlying the semiconductive coating and removing the semiconductive coating by a high pressure water spray. The process is useful for the formation of printed circuit boards.
27 Citations
25 Claims
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1. A process for preparing an article for electroplating, said process comprising the steps of providing an article having metallic surfaces and surfaces that are electrically nonconductive;
- coating surfaces of said article with a non-metallic, semiconductive, liquid permeable layer;
contacting said article with an etchant capable of dissolving said metallic surfaces without removing said semiconductive layer for a time sufficient to dissolve at least the top layer of said metallic surfaces; and
contacting said article with an aqueous spray at a spray pressure of at least 100 pounds per square inch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- coating surfaces of said article with a non-metallic, semiconductive, liquid permeable layer;
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11. A process for formation of a primed circuit board, said process comprising the steps of providing a copper clad printed circuit board base material having an array of holes therein;
- coating surfaces of said circuit board base material with a non-metallic, semiconductive, liquid permeable layer;
contacting said circuit board base material with an etchant capable of dissolving copper without dissolving said semiconductive layer for a time sufficient to dissolve at least the top layer of said copper surface;
contacting said circuit board base material with an aqueous spray at a spray pressure of at least 100 pounds per square inch to remove said semiconductive layer from all copper surfaces; and
electroplating said circuit board base material. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- coating surfaces of said circuit board base material with a non-metallic, semiconductive, liquid permeable layer;
Specification