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. 23, 1997
Filed:
Dec. 17, 1996
Applicant:
Inventor:
Balaram Ghosal, Fishkill, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437183 ; 437192 ; 437209 ; 437189 ;
Abstract
An outer coating of an electrically conductive material having low wetability with respect to solder is deposited over a gold coating previously deposited on an electrical contact element. After soldering the contact element to a substrate, the portion of the outer coating not covered by solder is removed from the contact element. The method of joining a contact element to a substrate in accordance with the present invention effectively solves the problem of solder climb to the critical contact area of the element without the need to provide masking or apply plating resist coatings to selected areas of the element.