Patents by Inventor Hilmar W. Spieth

Hilmar W. Spieth 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).

  • Patent number: 5268048
    Abstract: An integrated circuit is reworkably attached to a circuit board in a manner that forms a compliant bond which is stable under conditions of high thermal stress and thermal coefficient of expansion mismatch. A thermoplastic adhesive having a melting temperature higher than integrated circuit operating temperature is coated on the integrated circuit and dried. The adhesive is then cured. The coated integrated circuit is bonded to the circuit board with a thermosetting epoxy having a low curing temperature, such that curing the adhesive does not damage the circuit board. The integrated circuit is readily removed from the circuit board without damaging the board by heating the integrated circuit to soften the bond between the integrated circuit and the circuit board at the thermoplastic adhesive interface. An alternate embodiment of the invention provides a copper plate interface that is soldered to the circuit board, and to which an integrated circuit is permanently bonded.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: December 7, 1993
    Assignee: Hewlett-Packard Company
    Inventors: Jacques Leibovitz, Hilmar W. Spieth, Peter F. Dawson, Voddarahalli K. Nagesh