Ball grid array attaching means having improved reliability...

Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement

Reexamination Certificate

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C174S261000, C174S267000, C257S737000

Reexamination Certificate

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06963033

ABSTRACT:
An array of solder structures comprising a plurality of radially-curved exterior surfaces, each one enclosing a predetermined-sized cavity that can be used for flexibly joining together at predetermined conductive contact points two planar elements having dissimilar properties. By assembling the two planar elements in a tiered arrangement, one planar element having an array of annular conductive pads and the other planar element having either a corresponding array of annular or circular conductive pads, separated by an array of spherical solder balls comprised of solder and a fluxing agent, a hollow solder structure can be created during a melting and subsequent cooling of the solder compound. The plasticity/resiliency characteristics of the resulting hollow solder structure absorbs lateral movement of the two planar elements relative to each other without degradation of the solder joint.

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“Double Sided 4Mb SRAM Coupled Cap PBGA Card Assembly Guide”, Application Note, International Business Machines, pp. 1-11, (2/98).
“MicroStar BGA™ Packaging Reference Guide”, Texas Instruments, Literature No.: SSYZ015A, Second Edition, (Sep. 1999) [18 pages].

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