Patents Represented by Attorney Jeffrey L. Hood
  • Patent number: 5392980
    Abstract: A rework process for ball grid array (BGA) packages which allows for reuse of devices that have been removed for lack of integrity of solder interconnections. The process uses a rework tool which comprises a plate including one or more depressions corresponding to the contours of inverted BGA packages. A BGA package to be reworked is placed in a respective depression with what remains of the original solder ball grid facing upward. The residual solder balls are wicked away, thus leaving the BGA package with the pads that the solder balls were attached to being exposed. A stencil with BGA patterns punched into it is then placed over the rework tool and solder paste is screened onto the rework tool so that the solder is deposited on the BGA pads via the openings in the stencil. The entire fixture is then subjected to a reflow process to cause the solder to ball up during this process.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: February 28, 1995
    Assignee: Dell USA, L.P.
    Inventors: Deepak N. Swamy, Scott Estes, James Bell