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:
May. 24, 2016
Filed:
Sep. 12, 2014
Ibiden Co., Ltd., Ogaki-shi, JP;
Tetsuo Amano, Ogaki, JP;
Toshio Nishiwaki, Ogaki, JP;
IBIDEN CO., LTD., Ogaki-shi, JP;
Abstract
A printed wiring board includes a core insulation layer including a resin and having a via conductor through the core insulation layer, a first conductive layer formed on the core layer and including a copper foil and a plated film, an interlayer insulation layer formed on the first layer and including a resin, the interlayer layer having a via conductor through the interlayer layer, and a second conductive layer formed on the interlayer layer and including a copper foil and a plated film. The first layer includes a conductive circuit, the core and interlayer layers have dielectric constants of 4.0 or lower for signal transmission at frequency of 1 GHz and thermal expansion coefficient of 85 ppm/° C. or lower at or below Tg, and the foil of the first layer has thickness greater than thickness of the foil of the second layer.