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:
Aug. 31, 2004
Filed:
Feb. 28, 2003
Applicant:
Inventors:
Hirohisa Matsuki, Kawasaki, JP;
Yutaka Makino, Kawasaki, JP;
Masamitsu Ikumo, Kawasaki, JP;
Mitsutaka Sato, Kawasaki, JP;
Tetsuya Fujisawa, Kawasaki, JP;
Yoshitaka Aiba, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L 2/352 ;
U.S. Cl.
CPC ...
H01L 2/352 ;
Abstract
A structure in which a phosphorus-nickel layer, a rich phosphorus nickel layer that contains phosphorus or boron higher than this phosphorus-nickel layer, a nickel-tin ally layer, a tin-rich tin alloy layer, and a tin alloy solder layer are formed in sequence on an electrode. Accordingly, adhesiveness between a metal pattern used as the electrode, the wiring, or the pad and the solder can be improved.