Patents by Inventor David B. Everett

David B. Everett 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).

  • Tamper proof security measure in data writing to non-volatile memory
    Patent number: 5715431
    Abstract: A method of writing data to non-volatile memory such as electrically erasable programmable read only memory (EEPROM) in a smart card provides a write status region of EEPROM which is examined on each reset of the card. If the preceding write operation was unsuccessful, perhaps because of deliberate manipulation of the card, a recovery procedure is implemented. If recovery is successful, the card operation can be run. Otherwise the card is unusable.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: February 3, 1998
    Assignee: Mondex International Limited
    Inventors: David B. Everett, Keith M. Jackson, Ian Miller