Patents by Inventor Dong Gu Lim

Dong Gu Lim 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).

  • Tracking filter for selecting channel of wideband frequency
    Patent number: 7539470
    Abstract: The present invention relates to a filter, and more particularly, to a tracking filter for selecting a channel of a wideband frequency. The tracking filter for selecting a channel of a wideband frequency, which is for increasing the selectivity of a wideband frequency, includes: a first tracking portion for filtering and amplifying a specific frequency band while converting a low input impedance of the input terminal of the tracking filter into a high impedance; a second tracking portion for maintaining the high impedance of the first tracking portion, and for filtering and amplifying the specific frequency band while increasing the selectivity Q of a frequency outputted from the first tracking portion; and a third tracking portion for filtering the specific band wherein has low input impedance and high output impedance.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: May 26, 2009
    Assignee: Integrant Technologies, Inc.
    Inventors: Tae Wook Kim, Dong Gu Lim, Bonkee Kim, Junghwan Lee, Kwyro Lee