The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 1996
Filed:
Nov. 29, 1994
Tomoo Murakami, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A printed circuit board is manufactured by steps of forming on a laminate a plurality of penetrating holes, a plurality of semi-circular grooves, and a plurality of semi-circular through-holes. The plurality of penetrating holes are formed at predetermined locations along a straight line on the laminate board whose two surfaces are copper plated. The plurality of semi-circular grooves are formed from the penetrating holes which are cut into halves by a slit forming process. The plurality of semi-circular through-holes are formed using a jig member inserted into said slit and forming a copper plated layer on a surface of each of said semi-circular grooves. Highly reliable semi-circular through-holes can be formed because no peeling or burrs develop in the copper plated layer.