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:
May. 08, 2001
Filed:
Mar. 22, 1999
Applicant:
Inventors:
Luigi Bassi, Lodi, IT;
Michele Monopoli, Milan, IT;
Paolo Spinzi, Milan, IT;
Danilo Villa, Milan, IT;
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K 3/110 ; B23K 1/018 ;
U.S. Cl.
CPC ...
B23K 3/110 ; B23K 1/018 ;
Abstract
A method for reworking a Ball Grid Array electronic module by removing the solder balls from the substrate surface after one or more of the connections have been detected to be damaged. The module is immersed in a water soluble oil bath and heated to the melting point. Then a rotating brush, with the rotating axis perpendicular to the substrate plane, removes the solder balls and the solder material particles while the module is still immersed in the fluid.