Patents by Inventor Woo-Hyeuk Jang

Woo-Hyeuk Jang 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).

  • Optical polyimide precursor, optical polyimide compound and fabricating method thereof
    Patent number: 6891067
    Abstract: The present invention provides an optical polyimide precursor for use in making a polyimide. The precursor is defined by the following formula: wherein X is Cl, Br, oxo-halide, or fully halogenated alkyl, and A is a divalent aromatic or halogenated aromatic moiety. The present invention provides a method of preparing a diamine compound for use as an optical polyimide precursor. The method includes the steps of dissolving 2-chloro-5-nitrobenzotrifluoride and a diol in N,N-dimethylacetamide to form a solution, adding potassium carbonate, tert-butylammonium chloride and copper powder to said solution and heating the resulting mixture, removing the copper, precipitating and recrystallizing a dinitro-compound resulting from heating the mixture, and dissolving the dinitro-compound and reducing the dinitro-compound to yield a diamine compound.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: May 10, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyung-Hee You, Kwan-Soo Han, Tae-Hyung Rhee, Eun-Ji Kim, Jung-Hee Kim, Woo-Hyeuk Jang
  • Optical polyimide precursor, optical polyimide compound and fabricating method thereof
    Publication number: 20030065128
    Abstract: The present invention provides an optical polyimide compound defined by the following formula in an optical high polymer material: 1
    Type: Application
    Filed: October 8, 2002
    Publication date: April 3, 2003
    Inventors: Kyung-Hee You, Kwan-Soo Han, Tae-Hyung Rhee, Eun-Ji Kim, Jung-Hee Kim, Woo-Hyeuk Jang
  • Optical polyimide precursor, optical polyimide compound and fabricating method thereof
    Patent number: 6486292
    Abstract: The present invention provides an optical polyimide compound defined by the following formula in an optical high polymer material: wherein X is Cl, Br, oxo-halide, or fully halogenated alkyl; A is a divalent aromatic or halogenated aromatic moiety; and Z is a tetravalent moiety which may be a partly or fully fluorinated aromatic ring, a partly or fully chlorinated aromatic ring, a partly or fully fluorinated cycloaliphatic group, a partly or fully chlorinated aliphatic group, or combinations thereof connected via hetero atoms.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: November 26, 2002
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyung-Hee You, Kwan-Soo Han, Tae-Hyung Rhee, Eun-Ji Kim, Jung-Hee Kim, Woo-Hyeuk Jang
  • Optical polyimide precursor, optical polyimide compound and fabricating method thefeof
    Publication number: 20010023286
    Abstract: The present invention provides an optical polyimide compound defined by the following formula in an optical high polymer material: 1
    Type: Application
    Filed: March 7, 2001
    Publication date: September 20, 2001
    Inventors: Kyung-Hee You, Kwan-Soo Han, Tae-Hyung Rhee, Eun-Ji Kim, Jung-Hee Kim, Woo-Hyeuk Jang