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. 06, 2004
Filed:
Jul. 02, 2002
Applicant:
Inventors:
Nobuyoshi Tatoh, Itami, JP;
Jun Yorita, Hyogo, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K 1/11 ; H05K 1/03 ;
U.S. Cl.
CPC ...
H05K 1/11 ; H05K 1/03 ;
Abstract
A circuit board comprising a first metal layer formed in patterns on a ceramic substrate, a second metal layer formed in patterns on the first metal layer, and a third metal layer formed covering the top surface of the second metal layer and the majority of the side surface, wherein the first and partial second metal layers not covered by the third metal layer are reduced in width by etching. The circuit board has a fine and high-resolution wiring pattern and makes it possible to realize a miniature high-performance high-output module by mounting at least one high-output semiconductor element thereon.