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:
Jul. 12, 2011
Filed:
Nov. 08, 2006
Yuuji Suzuki, Nikkou, JP;
Yuuki Kikuchi, Nikkou, JP;
Satoru Zama, Tokyo, JP;
Furukawa Circuit Foil., Ltd., Nikkou, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A through-hole type laminated circuit board is given with high reliability of electrical connection using copper foil and conductive paste containing low melting point metal without generating harmful void and crack at boundary between the copper foil and conductive paste metal. The laminated circuit board is made by laminating a multiple number of resin boards with roughening treated copper foils at least on their one surface sides with roughening projection deposition of less than 150 mg/dmto make surface roughness Rz of 0.3 to 10 μm and height of the projection to be 0.3 to 10 μm. Surface roughness of the original foil is 0.1 to 5 μm and the amount of copper metal atoms of roughening treated layer is set at 4 times or less than the amount of diffusible conductive paste metal atoms containing low melting point metal into the roughening treated layer on the foil surface.