Patents by Inventor Ui Sik Kwak

Ui Sik Kwak 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).

  • Intermediate frequency local generating circuit
    Patent number: 6385443
    Abstract: An IF local generating circuit for a broadband communication system using a plurality of carriers is disclosed. In the present invention, one IF phase locked loop converts the IF signals to baseband signals by a downward processing of frequency in the receiving end of the broadband portable terminal.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: May 7, 2002
    Assignee: LG Information & Communications, Ltd.
    Inventors: Sang Jin Lee, Ui Sik Kwak, Jong Jin Kim