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:
Jan. 05, 2021
Filed:
Aug. 03, 2018
Sumitomo Electric Printed Circuits, Inc., Shiga, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Tadahiro Kaibuki, Shiga, JP;
Daisuke Sato, Shiga, JP;
Haruna Oya, Shiga, JP;
Yoshiaki Yanagimoto, Shiga, JP;
Atsushi Kimura, Osaka, JP;
Shigeki Shimada, Osaka, JP;
SUMITOMO ELECTRIC PRINTED CIRCUITS, INC., Shiga, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Abstract
A printed wiring board of the present invention includes an insulating substrate layer; a first conductive layer laminated to one surface of the substrate layer; a second conductive layer laminated to another surface of the substrate layer; and a via hole formed along an inner surface of a connection hole that is provided, in a thickness direction, through the substrate layer and the first conductive layer, the via hole electrically coupling the first conductive layer and the second conductive layer. A cross-sectional shape of the connection hole along at least one surface of the substrate layer is an irregular shape.