Patents by Inventor Rafique S. Shariff

Rafique S. Shariff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cryogenic chip removal technique
    Patent number: 4274576
    Abstract: A semiconductor chip mounted on a substrate by solder columns connecting one side of the chip to the substrate, is removed from the substrate by cooling the unconnected side of the chip to embrittle the solder columns and then twisting the chip with small angle rotational motion to shear the columns at their midpoints. A mechanism for cooling and rotating the chip makes use of the cooling substance to minimize the contact of the substrate with the cooling substance.
    Type: Grant
    Filed: November 13, 1979
    Date of Patent: June 23, 1981
    Assignee: International Business Machines Corporation
    Inventor: Rafique S. Shariff