Patents by Inventor Grazyna E. Muellner

Grazyna E. Muellner 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).

  • Radiotelephone controller configured for coresident secure and nonsecure modes
    Patent number: 5060264
    Abstract: A controller for a radiotelephone having the capability of operation in both a secure mode for call authorization and a nonsecure mode for user interface is disclosed. The nonsecure mode and secure mode of operation are both resident in a single microcontroller which runs the nonsecure operations until a requirement for the secure operation is requested during call placement. The nonsecure mode is disabled during the period of time the secure mode is operational and is reenabled upon completion of the secure mode operation. The secure mode cannot be accessed externally to the microcontroller.
    Type: Grant
    Filed: January 5, 1990
    Date of Patent: October 22, 1991
    Assignee: Motorola, Inc.
    Inventors: Grazyna E. Muellner, Rafaele Pini, Dennis Cashen, Patrick J. Marry, David K. Ford