Patents by Inventor Zeth Nystrom

Zeth Nystrom 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).

  • Digital mobile telephone system in which each subscriber is assigned a telephone number and several subscriber identity module (SIM) cards
    Patent number: 5657373
    Abstract: A digital mobile communication system comprises a switching center (MSC), a subscriber register (HLR) connected thereto, mobile terminals, such as mobile telephones, and subscriber-linked subscriber's cards, such as smart cards. Each subscription is allocated a subscriber's number and at least two subscriber's cards adapted to be activated so as to open a mobile terminal to incoming as well as outgoing traffic when inserted therein. When one of the subscriber's cards is activated, the other card or cards are necessarily deactivated so as to open a mobile terminal only to outgoing traffic when inserted therein. The subscriber register (HLR) is adapted to control the activation and the deactivation of the cards by the order of the subscriber.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: August 12, 1997
    Assignee: Europolitan AB
    Inventors: Jan Hermansson, Christer Mansson, Anders Jacobsson, Zeth Nystrom, Bo Karlsson, Christer Palmgren, Goran Leuhusan, Flemming Orneholm