Patents Assigned to United States Voting Machines, Inc.
  • 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