Patents by Inventor Viet A. Nguyen

Viet A. Nguyen 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).

  • Home location register for manual visitors in a telecommunication system
    Patent number: 5564068
    Abstract: A manual home location register (M-HLR) for use in a cellular telecommunication system provides manual visitors in a visited network with the same registration capabilities as automatic visitors from networks that have automatic roaming agreements with the visited network. The M-HLR maintains a database of manual visitor information separate from the network's database of home subscribers and automatic visitors. Initial registration in the visited network by a manual visitor is recorded in the M-HLR and enables the manual visitor to roam freely between multiple mobile switching centers (MSCs) in the visited network without having to re-register in each MSC.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: October 8, 1996
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Viet A. Nguyen
  • System for routing calls to mobile subscribers
    Patent number: 5526400
    Abstract: The local access and transport area identification number (LATAID) of the area within which both the A- party and B-party of a call are located is indicated within all roamer routing messages. This information enables automatic call setup within a cellular network in the most cost effective manner which still complies with the interLATA carrier regulations.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: June 11, 1996
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Viet A. Nguyen