Patents by Inventor Chang-Duk Lee

Chang-Duk Lee 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 for paging high-speed subscriber by roaming reservation in radio paging switching system
    Patent number: 6253078
    Abstract: A method for paging a high-speed subscriber by a roaming reservation in a radio paging switching system. The method includes the steps of registering a roaming area and a scheduled arrival time through a voice mail system; converting a format of the registered information and transmitting the registered information to the radio paging switching system; transmitting the registered information to a radio paging terminal so that the radio paging switching system can synchronize with the radio paging terminal in an area, a time and a frequency; and checking a timer of a corresponding area, and if a registered time elapses, storing, in a data base, information that a subscriber moves into the corresponding area, thus to provide the subscriber with a roaming service.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: June 26, 2001
    Assignee: SamSung Electronics Do., Ltd.
    Inventor: Chang-Duk Lee
  • Wide area paging sevice processing method and apparatus of a radio paging system
    Patent number: 5862484
    Abstract: A wide area paging service processing method for a radio paging system connected to a public switched telephone network and having a paging system capable of transmitting a radio paging signal.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: January 19, 1999
    Assignee: SamSung Electronics Co., Ltd.
    Inventor: Chang-Duk Lee