Patents by Inventor Johann Hajdu, deceased

Johann Hajdu, deceased 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).

  • Hierarchical memory system for microcode and means for correcting errors in the microcode
    Patent number: 5898867
    Abstract: A multiprocessor computer system includes a system clock, a main memory connected through a memory bus to a microinstruction memory and a microinstruction decoder. Circuitry detects whether the microinstruction being decoded is the wrong microinstruction or has a parity error. On detection of such an erroneous microinstruction, the microinstruction is reloaded from the main memory into the microinstruction memory and then passed to the microinstruction decoder without interrupting the system clock or operation of the other processors.
    Type: Grant
    Filed: October 6, 1993
    Date of Patent: April 27, 1999
    Assignee: International Business Machines Corporation
    Inventors: Klaus Joerg Getzlaff, Johann Hajdu, deceased, Brigitte Roethe, Udo Wille