Patents by Inventor William Chambers Shepard

William Chambers Shepard 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).

  • Logical positioning within a storage device by a storage controller
    Patent number: 6055602
    Abstract: A logical positioning mechanism is provided within a storage controller, thus enabling the storage controller to determine which logical position in a storage device is to be accessed next. The logical positioning mechanism includes one or more logical position indicators defined, maintained and controlled by the storage controller. The logical position indicators include the address of the logical position to be next accessed and are incremented and decremented by the storage controller depending upon the operation accessing the logical position.
    Type: Grant
    Filed: June 3, 1998
    Date of Patent: April 25, 2000
    Assignee: International Business Machines Corporation
    Inventors: James Elkins McIlvain, William Chambers Shepard
  • Concurrent switch to shadowed device for storage controller and device errors
    Patent number: 5870537
    Abstract: A disaster recovery system providing remote data shadowing between a primary and a secondary site uses a method and apparatus for swapping, or switching, host directed I/O operations from a primary data storage device to a secondary data storage device in a remote copy duplex pair. Application programs running in a host processor at the primary site first quiesce all I/O operations and record updates targeted to the primary data storage device. The remote copy duplex pair is checked to verify that the secondary data storage device is a fully synchronized copy of the primary data storage device.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: February 9, 1999
    Assignee: International Business Machines Corporation
    Inventors: Robert Frederic Kern, Michael Aloysius Paulsen, William Chambers Shepard, Harry Morris Yudenfriend
  • Logical positioning within a storage device by a storage controller
    Patent number: 5765200
    Abstract: A logical positioning mechanism is provided within a storage controller, thus enabling the storage controller to determine which logical position in a storage device is to be accessed next. The logical positioning mechanism includes one or more logical position indicators defined, maintained and controlled by the storage controller. The logical position indicators include the address of the logical position to be next accessed and are incremented and decremented by the storage controller depending upon the operation accessing the logical position.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: June 9, 1998
    Assignee: International Business Machines Corporation
    Inventors: James Elkins McIlvain, William Chambers Shepard