Patents by Inventor Charles D. Hultgren

Charles D. Hultgren 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).

  • Fault tolerant computer with archival rollback capabilities
    Patent number: 5325519
    Abstract: A computer system comprises a storage device comprising a plurality of locations for storing data and having a defined audit partition region comprising one or more of said locations and processing circuitry for detecting access requests to alter data on respective sets of one or more of locations of the storage device. Responsive to each access request, the processing circuitry stores data from said respective set of locations in the audit partition region prior to performing the access request, such that a sequence of data transfers from the storage device is stored in the audit partition region in a known order. Responsive to a user request, data is restored from the sequence of data transfers in the audit partition region to the respective set of locations on the storage device to return the storage device to a previous state.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: June 28, 1994
    Assignee: Texas Microsystems, Inc.
    Inventors: Donald W. Long, Charles D. Hultgren
  • Computer system unit
    Patent number: D345964
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: April 12, 1994
    Assignee: Texas Microsystems, Inc.
    Inventors: Charles D. Hultgren, James L. Schlemmer, Dan G. Luce, John C. Leonardo, Jr., Lindsay Gupton