Patents by Inventor Annika Birgitta Lindh

Annika Birgitta Lindh 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).

  • Method to perform subsidy protection for TDMA mobile stations
    Patent number: 6445914
    Abstract: A method of activating a mobile station used in a cellular network system provides subsidy protection for a cellular operator. The method comprises the steps of installing a subscriber identity module (SIM) in the mobile station, the SIM having an IMSI file and storing the first indicia uniquely identifying the cellular operator, the mobile station storing second indicia uniquely identifying the cellular operator; comparing the first indicia to the second indicia to determine if the SIM and the mobile station are valid for the cellular operator; and if the SIM and the mobile station are valid, then storing a mobile identity number in the IMSI file of the SIM.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: September 3, 2002
    Assignee: Ericsson, Inc.
    Inventors: Nadi Sakir Findikli, Inderpreet Singh Ahluwalia, Hans Carlsson, Annika Birgitta Lindh