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. 16, 1991
Filed:
Apr. 18, 1990
Applicant:
Inventors:
Keith R Pope, Austin, TX (US);
Gustav Schrottke, Austin, TX (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05K / ;
U.S. Cl.
CPC ...
29840 ; 29857 ; 228123 ; 2281802 ; 361406 ; 437180 ;
Abstract
A method of nondestructively testing electronic chips adapted for direct attachment to metallized pads on circuitized substrate is disclosed, wherein an electrically conductive liquid eutectic joint is formed at room temperature with low pressure between electrical terminals on the chip and pads on the substrate. The eutectic joint remains liquid at test temperature, enabling test completion. At the end thereof, chips and pads are separated and any eutectic material residue thereon removed. The eutectic is preferably gallium/indium.