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:
Nov. 08, 1994
Filed:
Jul. 24, 1992
Applicant:
Inventors:
Assignee:
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K / ;
U.S. Cl.
CPC ...
174256 ; 174258 ;
Abstract
A circuit substrate for mounting a semiconductor element comprises an aluminum-copper clad foil laminated on a metallic base plate by interposing an insulating layer, wherein the roughness in average of the surface in contact with the insulating layer of the aluminum-copper clad foil is in a range of from 0.5 .mu.m to 50 .mu.m.