Fishing – trapping – and vermin destroying
Patent
1996-01-31
1997-06-17
Picardat, Kevin
Fishing, trapping, and vermin destroying
437211, 437214, 437217, H01L 2160
Patent
active
056396961
ABSTRACT:
An integrated circuit is mounted on and interconnected with a circuit board by an array of electrically conductive columns. The assembly is fabricated by initially interconnecting the integrated circuit and the circuit board with an array of reflowable electrically conductive solder balls that correspond to the columns respectively. The circuit board is held with the integrated circuit extending downwardly therefrom. Sufficient heat is applied to cause the solder balls to reflow. The integrated circuit is pulled downwardly away from the circuit board by gravity such that the balls are stretched to form the columns, and the assembly is allowed to cool such that the columns solidify. A fixture may be provided against which the integrated circuit abuts after it has moved away from the circuit board by a predetermined distance such that the columns have a precisely determined height.
REFERENCES:
patent: 5284796 (1994-02-01), Nakanishi et al.
patent: 5288944 (1994-02-01), Bronson
patent: 5346857 (1994-09-01), Scharr et al.
patent: 5355283 (1994-10-01), Maars et al.
patent: 5359768 (1994-11-01), Haley
Liang Dexin
Schneider Mark R.
LSI Logic Corporation
Picardat Kevin
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