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:
Jan. 13, 2004
Filed:
Oct. 21, 2002
Applicant:
Inventors:
Hisahiro Tanaka, Fukuoka, JP;
Matsuo Masuda, Oita, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B 1/501 ; C25D 3/60 ; C25D 5/18 ; H01L 2/3495 ;
U.S. Cl.
CPC ...
B32B 1/501 ; C25D 3/60 ; C25D 5/18 ; H01L 2/3495 ;
Abstract
A tin-silver alloy plating film improved in solderability and flex cracking characteristics is provided by producing it by an electroplating process which uses a current having a pulse waveform of a current passing period of not less than 3 ms and not more than 500 ms and a stopping period of not less than 1 ms and not more than 500 ms with a proviso that the stopping period is equal to or shorter than the passing period.