Patents by Inventor Ji-Hwan Keum

Ji-Hwan Keum 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).

  • Heating crucible and deposition apparatus using the same
    Patent number: 8025733
    Abstract: A deposition apparatus includes a vacuum chamber and a heating crucible. A substrate, on which deposition films are formed, is installed in the vacuum chamber. The heating crucible is installed opposite to the substrate so as to vaporize an organic compound. The heating crucible includes a main body and an inner plate. The main body includes a space which contains the organic compound and a nozzle through which the organic compound that is vaporized is discharged. The inner plate is installed within the main body and includes at least one opening formed around an edge of an area facing the nozzle, so as to transmit the vaporized organic compound.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: September 27, 2011
    Assignee: Samsung Mobile Display Co., Ltd.
    Inventors: Ji Hwan Keum, Chang Soon Ji, Hyung Min Kim, Sung Tae Namgoong
  • 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
  • Heating crucible and deposition apparatus using the same
    Publication number: 20040035366
    Abstract: A deposition apparatus includes a vacuum chamber and a heating crucible. A substrate, on which deposition films are formed, is installed in the vacuum chamber. The heating crucible is installed opposite to the substrate so as to vaporize an organic compound. The heating crucible includes a main body and an inner plate. The main body includes a space which contains the organic compound and a nozzle through which the organic compound that is vaporized is discharged. The inner plate is installed within the main body and includes at least one opening formed around an edge of an area facing the nozzle, so as to transmit the vaporized organic compound.
    Type: Application
    Filed: July 16, 2003
    Publication date: February 26, 2004
    Applicant: Samsung NEC Mobile Display Co., Ltd.
    Inventors: Ji Hwan Keum, Chang Soon Ji, Hyung Min Kim, Sung Tae Namgoong
  • 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