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:
Apr. 11, 2000
Filed:
Jul. 17, 1998
Applicant:
Inventors:
Pietro Luigi Cavalloti, Milan, IT;
Vittorio Sirtori, Milan, IT;
Giovanni Zangari, Pittsburgh, PA (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428647 ; 22818022 ; 29840 ;
Abstract
An electronic device has a layer of high wettability tin-bismuth solder alloy on component leads and substrate pads. The solder is electrodeposited onto copper with an electrodeposition bath containing a zinc salt, although no zinc is co-deposited on the copper. The tin-bismuth layer has a low quantity of oxygen thereby increasing the wettability and decreasing the oxidation at the surface after reflowing.