Patents by Inventor David C. Beckwith

David C. Beckwith 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).

  • Locking memory device
    Patent number: 5379212
    Abstract: A method and apparatus for locking a memory device to prevent unauthorized data from being written to the memory device is disclosed. In a preferred embodiment an address of a memory device is selected such that when that address is selected, a "1" is written to an auxiliary memory device. This event causes the write-enable of the main memory to be disabled thereby locking the main memory device and preventing subsequent write operations thereto.
    Type: Grant
    Filed: February 11, 1993
    Date of Patent: January 3, 1995
    Assignee: United States Voting Machines, Inc.
    Inventors: Larry W. Sarner, David C. Beckwith