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:
Sep. 02, 2008
Filed:
Feb. 18, 2004
Applicants:
Akihiro Aiba, Kitaibaraki, JP;
Yoshiyuki Hisumi, Kitaibaraki, JP;
Kazumi Kawamura, Kitaibaraki, JP;
Inventors:
Assignee:
Nikko Materials Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 18/31 (2006.01);
U.S. Cl.
CPC ...
Abstract
There is provided a cyanide-free immersion type electroless gold plating liquid that is low in toxicity, can be used near a neutral ph, and has a good solder adhesion and plating film adhesion. The electroless gold plating liquid contains a cyanide-free water-soluble gold compound and a pyrosulfurous acid compound. The plating liquid may further contain a sulfurous acid compound and an aminocarboxylic acid compound. Pyrosulfurous acid or an alkali metal, alkaline earth metal, ammonium, or another such salt thereof can be used as the pyrosulfurous acid compound.