Patent 7776199 was granted and assigned to Fujikura on August, 2010 by the United States Patent and Trademark Office.
The present invention provides a printed wiring board free from undercuts, which can be formed by an additive method without a dry treatment and a dry treatment apparatus, and a production method thereof. A printed wiring board of the present invention has a conductor circuit free from undercuts which is produced by carrying out additional plating to fill undercuts.