PRINTED CIRCUIT BOARD PRECURSOR
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United States of America Patent
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May 9, 2016
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Jul 17, 2013
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Abstract
A printed circuit board precursor includes a substrate, a catalytic layer, a conductive layer, and a metal layer. The substrate has a top surface, a bottom surface, and a wall defining a channel, and the channel completely penetrates through the substrate from the top surface to the bottom surface. The catalytic layer is formed on the top surface, the bottom surface, and the wall of the substrate. The conductive layer is attached to and covers the catalytic layer. The metal layer is disposed on the conductive layers and filled in the channel.
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