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:
Oct. 31, 2006
Filed:
May. 27, 2004
Applicants:
Nobuyoshi Tsukaguchi, Shiojiri, JP;
Michihiro Kosaka, Shiojiri, JP;
Inventors:
Nobuyoshi Tsukaguchi, Shiojiri, JP;
Michihiro Kosaka, Shiojiri, JP;
Assignee:
Dowa Mining Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 21/302 (2006.01);
U.S. Cl.
CPC ...
Abstract
A metal layerof aluminum or an aluminum alloy is formed on at least one side of a ceramic substrate, and a resisthaving a predetermined shape is formed on the metal layer. Then, an etchant of a mixed solution prepared by mixing ferric chloride with water without adding any acids is used for etching and removing an undesired portion of the metal layerto form a metal circuiton the at least one side of the ceramic substrate