Patents by Inventor Ha-Keun Hwang

Ha-Keun Hwang 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).

  • Red fluorescent material and organic electroluminescent device containing same
    Patent number: 6821651
    Abstract: A novel red fluorescent material of formula (I) of the present invention has an improved thermostability, and an organic electroluminescent device containing the fluorescent material of formula (I) can provide color ranging from orange to deep red.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: November 23, 2004
    Assignee: Nessdisplay Co., Ltd.
    Inventors: Ki-Jong Han, Ha-Keun Hwang, Dae-Seok Jun, Ji-Hwan Keum, Young-Kyoo Kim
  • Novel red fluorescent material and organic electroluminescent device containing same
    Publication number: 20040014392
    Abstract: A novel red fluorescent material of formula (I) of the present invention has an improved thermostability, and an organic electroluminescent device containing the fluorescent material of formula (I) can provide color ranging from orange to deep red.
    Type: Application
    Filed: May 19, 2003
    Publication date: January 22, 2004
    Inventors: Ki-Jong Han, Ha-Keun Hwang, Dae-Seok Jun, Ji-Hwan Keum, Young-Kyoo Kim