Patents by Inventor Robert D. Frith

Robert D. Frith 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).

  • Communication system user authentication method
    Patent number: 5696880
    Abstract: The authentication method established a communication link between the calling and called users (14). The calling and called parties exchange voice identification data (22). The calling and called parties determine if the voice identification data compares (26,30). If voice identification data compares, a secure call is enabled (32). If the voice identification data does not compare the communication link is terminated (20).
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: December 9, 1997
    Assignee: Motorola, Inc.
    Inventors: David T. Gustafson, Richard G. Shepherd, Robert D. Frith