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. 14, 2009
Filed:
Sep. 25, 2006
Hiroaki Tomimori, Kanagawa, JP;
Hidemitsu Aoki, Kanagawa, JP;
Kaoru Mikagi, Kanagawa, JP;
Akira Furuya, Kanagawa, JP;
Tetsuya Tao, Kanagawa, JP;
Hiroaki Tomimori, Kanagawa, JP;
Hidemitsu Aoki, Kanagawa, JP;
Kaoru Mikagi, Kanagawa, JP;
Akira Furuya, Kanagawa, JP;
Tetsuya Tao, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
An oxide film formed on the surface of copper film of an electrode pad is cleaned by oxalic acid after unevenness is formed on the surface of copper film by treating the surface with organic acid. Thereby, stable resistance is obtained when carrying out a characteristic inspection by bringing a probe into contact with the electrode pad, and it is easily recognized by observation through a microscope that the probe is brought into contact with the electrode pad. In addition, wettability with respect to solder is satisfactory, and it is possible to favorably form a solder bump on the electrode pad.