Patents by Inventor Clark J. Spencer

Clark J. Spencer 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).

  • Shadow register file for instruction rollback
    Patent number: 5568380
    Abstract: A fault-tolerant computer system having shadow registers for storing the contents of a primary array into a shadow array at the completion of a stored instruction execution. This is accomplished in one clock cycle with all registers being shadowed simultaneously. During rollback of execution steps for a checkpoint retry, the shadow register files provide a signal cycle unload of the shadow array into the primary array. LSSD latches are used in the shadow register file.
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: October 22, 1996
    Assignee: International Business Machines Corporation
    Inventors: Timothy B. Brodnax, John S. Bialas, Jr., Steven A. King, Johnny J. LeBlanc, Dale A. Rickard, Clark J. Spencer, Daniel L. Stanley