Patents by Inventor Eui-Jun Choi

Eui-Jun Choi 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).

  • HETEROCYCLIC COMPOUND, ORGANIC LIGHT-EMITTING DEVICE COMPRISING SAME, MANUFACTURING METHOD THEREFOR, AND COMPOSITION FOR ORGANIC MATERIAL LAYER
    Publication number: 20240107878
    Abstract: The present specification relates to a heterocyclic compound represented by Chemical Formula 1, an organic light emitting device comprising the same, a manufacturing method thereof, and an organic material layer composition.
    Type: Application
    Filed: November 30, 2021
    Publication date: March 28, 2024
    Applicant: LT MATERIALS CO., LTD.
    Inventors: Eui-Jeong CHOI, Young-Seok NO, Dong-Jun KIM
  • XYLYLENE DIISOCYANATE COMPOSITION AND OPTICAL COMPOSITION COMPRISING SAME
    Publication number: 20240026063
    Abstract: A xylylene diisocyanate composition according to exemplary embodiments includes xylylene diisocyanate (XDI) and chloromethylbenzyl isocyanate (CBI), and may satisfy a predetermined relationship between an acidity and a content of CBI. Thereby, an optical lens having a high transmittance and improved optical uniformity can be manufactured by controlling a polymerization reaction rate.
    Type: Application
    Filed: November 30, 2021
    Publication date: January 25, 2024
    Inventors: Jae Young PAI, Jung Hwan MYUNG, Hyuk Hee HAN, Kyeong Hwan YOU, Jeong Moo KIM, Eui Jun CHOI, Jung Hwan SHIN
  • POLYTHIOL COMPOSITION, OPTICAL COMPOSITION, AND OPTICAL PRODUCTS
    Publication number: 20230322665
    Abstract: A polythiol composition according to exemplary examples includes a tetrafunctional polythiol compound, and a sub-polythiol compound including a compound represented by C13H28S9 and a compound represented by C15H32S10. A ratio of the sub-polythiol compound measured through a high performance liquid chromatography (HPLC) analysis graph is 1% to 5%. By adjusting the content of the sub-polythiol compound, it is possible to manufacture an optical product having excellent transmittance and optical properties.
    Type: Application
    Filed: August 31, 2021
    Publication date: October 12, 2023
    Inventors: Jae Young PAI, Kyeong Hwan YOU, Jung Hwan MYUNG, Hyuk Hee HAN, Jeong Moo KIM, Eui Jun CHOI, Jung Hwan SHIN
  • XYLYLENE DIISOCYANATE COMPOSITION AND OPTICAL POLYMERIZABLE COMPOSITION INCLUDING THE SAME
    Publication number: 20230087212
    Abstract: The xylylene diisocyanate composition according to exemplary examples includes xylylene diisocyanate (XDI), and an acidity adjusting agent having a boiling point of 110° C. or higher, wherein the composition has an acidity of more than 100 ppm and 1,000 ppm or less based on a total weight of xylylene diisocyanate (XDI). A polymerization reaction rate is controlled through regulation of the acidity so that an optical lens having high transmittance and improved optical uniformity may be manufactured.
    Type: Application
    Filed: August 24, 2022
    Publication date: March 23, 2023
    Inventors: Jae Young PAI, Jeong Moo Kim, Hyuk Hee Han, Kyeong Hwan You, Jung Hwan Myung, Eui Jun Choi, Jung Hwan Shin
  • POLYMERIZABLE COMPOSITION AND OPTICAL MATERIAL USING THE SAME
    Publication number: 20220389147
    Abstract: A polymerizable composition according to an embodiment includes a first polymerizable compound including isophorone diisocyanate and hexamethylene diisocyanate, and a second polymerizable compound including 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol and pentaerythritol tetrakis(mercaptoacetate). An optical material which is fabricated from the polymerizable composition and has improved optical, mechanical and thermal properties is provided.
    Type: Application
    Filed: May 24, 2022
    Publication date: December 8, 2022
    Inventors: Hyuk Hee HAN, Eui Jun Choi, Kyeong Hwan You, Jung Hwan Myung, Jae Young Pai, Jeong Moo Kim, Jung Hwan Shin
  • Micro-serrated, dyed color toner particles and method of making same
    Patent number: 6544705
    Abstract: A color toner composition includes dyed toner resin particles having a volume average diameter in the range of from about 2 microns to about 10 microns with a size distribution span value of less than 1.0. Preferred particles are characterized further by a micro-serrated surface exhibiting a roughness index value larger than about 1.2. The resin toner particles are prepared utilizing a dye-mediating co-solvent which facilitates transfer from a dispersion medium to the resin particles.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: April 8, 2003
    Assignee: DPI Solutions, Inc.
    Inventors: Chul-Hwan Kim, Eui-Jun Choi, Tae-Ho Park, Seok-Jin Kim, Hyun-Nam Yoon
  • Micro-serrated, dyed color toner particles and method of making same
    Publication number: 20020182527
    Abstract: A color toner composition includes dyed toner resin particles having a volume average diameter in the range of from about 2 microns to about 10 microns with a size distribution span value of less than 1.0. Preferred particles are characterized further by a micro-serrated surface exhibiting a roughness index value larger than about 1.2. The resin toner particles are prepared utilizing a dye-mediating co-solvent which facilitates transfer from a dispersion medium to the resin particles.
    Type: Application
    Filed: May 18, 2001
    Publication date: December 5, 2002
    Inventors: Chul-Hwan Kim, Eui-Jun Choi, Tae-Ho Park, Seok-Jin Kim, Hyun-Nam Yoon