Patents by Inventor Cheol-Kyu Choi

Cheol-Kyu 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).

  • Patent number: 9902854
    Abstract: A polyamide composite resin composition for a fuel filler pipe includes 41 to 77% by weight of polyamide 6, 5 to 15% by weight of m-xylenediamine (MXD)-based modified nylon, 14 to 30% by weight of a maleic anhydride-grafted ethylene-octene copolymer, a maleic anhydride-grafted ethylene-propylene-diene monomer, or a mixture thereof, and 3 to 10% by weight of mixed clay.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: February 27, 2018
    Assignees: HYUNDAI MOTOR COMPANY, SHINIL CHEMICAL INDUSTRY CO., LTD., KOREA FUEL-TECH CORPORATION
    Inventors: Jee Young Youn, Dong Yol Ryu, Dong Chul Lee, Bo Ram Kwon, Ki Hong Kim, Keum Suk Seo, Cheol Kyu Choi
  • Publication number: 20170166745
    Abstract: A polyamide composite resin composition for a fuel filler pipe includes 41 to 77% by weight of polyamide 6, 5 to 15% by weight of m-xylenediamine (MXD)-based modified nylon, 14 to 30% by weight of a maleic anhydride-grafted ethylene-octene copolymer, a maleic anhydride-grafted ethylene-propylene-diene monomer, or a mixture thereof, and 3 to 10% by weight of mixed clay.
    Type: Application
    Filed: July 26, 2016
    Publication date: June 15, 2017
    Inventors: Jee Young YOUN, Dong Yol RYU, Dong Chul LEE, Bo Ram KWON, Ki Hong KIM, Keum Suk SEO, Cheol Kyu CHOI
  • Patent number: 7868541
    Abstract: Provided is a white light emitting organic electroluminescent device, which includes a transparent substrate, a first element, and a second element, wherein the first element includes a first anode, a first element organic layer, and a reflective cathode sequentially disposed on a first substrate of the transparent substrate, and wherein the second element includes a second anode, a second element organic layer, and a transparent or translucent cathode sequentially disposed on a second surface of the transparent substrate.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: January 11, 2011
    Assignee: Doosan Corporation
    Inventors: Ho-Cheol Park, Cheol-Kyu Choi, Jong-Wook Park, Ji-Bum Yang
  • Publication number: 20090001882
    Abstract: Provided is a white light emitting organic electroluminescent device, which includes a transparent substrate, a first element, and a second element. The first element includes a first anode, a first element organic layer, and a reflective cathode sequentially disposed on a first substrate of the transparent substrate. The second element includes a second anode, a second element organic layer, and a transparent or translucent cathode sequentially disposed on a second surface of the transparent substrate. The white light emitting organic electroluminescent device of the present invention can eliminate the color coordinates shift phenomenon of white light that occurs in a conventional three primary color white light organic electroluminescent device. Since the aging effect caused by heat generated from light emission is reduced by dividing electroluminescent layers, the electroluminescent device can have a long lifespan.
    Type: Application
    Filed: December 22, 2006
    Publication date: January 1, 2009
    Applicant: Doosan Corporation
    Inventors: Ho-Cheol Park, Cheol-Kyu Choi, Jong-Wook Park, Ji-Bum Yang
  • Publication number: 20070116984
    Abstract: The present invention relates to a spiro-compound for an electroluminescence display device and an electroluminescence display device including the same. More particularly, the present invention relates to a spiro-compound comprising at least one selected from the group consisting of a compound represented as the following Formulae 1 and 2 and an electroluminescence display device including the same: In the above Formulae 1 and 2, the definition of the substituents is the same as in the specification. The spiro-compounds represented by the above Formulae 1 and 2 are applicable to any one of a hole injection layer (HIL), a hole transport layer (HTL), an electroluminescent layer, an electron transport layer (ETL), and an electron injection layer (EIL) of the electroluminescence display device. The spiro-compound can realize various colors with low energy, emit blue light even at a low voltage, and have an advantage of excellently increasing luminance and luminous efficiency.
    Type: Application
    Filed: September 21, 2006
    Publication date: May 24, 2007
    Applicant: DOOSAN CORPORATION
    Inventors: Jong-Wook PARK, Ji-Hoon LEE, Cheol-Kyu CHOI, Kyoung-Soo KIM, Sang-Do LEE
  • Patent number: 5703139
    Abstract: The present invention relates to a photo-curable resin composition which shows an excellent antistatic property and staining resistance by introducing aliphatic trifunctional urethane acrylate prepolymer therein and to a product coated with said resin composition. Specifically, the photo-curable resin composition according to the present invention are useful for coating a product made from metacrylate resin, vinylchloride resin, ABS resin or carbonate resin. The photo-curable resin composition according to the present invention can comprise reactive diluent, photoinitiator and additives in addition to said prepolymer.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: December 30, 1997
    Assignee: HANWHA Chemical Corporation
    Inventors: Sang-Keun Kim, Seoung-Ho Kim, Haeng-Woo Lee, Cheol-Kyu Choi, Jeong-Deuk Kim, Jin-Who Hong, Chang-Soo Kim, Kong-Hyun Whang
  • Patent number: 5703142
    Abstract: The present invention relates to a photo-curable prepolymer having the following formula (I): ##STR1## in which W represents ##STR2## R.sub.1 represents hydrogen or methyl; R.sub.1 ' represents ##STR3## wherein X represents chlorine or bromine atom, R.sub.2 represents methyl or ethyl, n, o and q independently of one another denote an integer of 1 to 6 and p denotes an integer of 0 to 6;R.sub.2 ' and R.sub.3 ' are identical to or different from each other and represent ##STR4## wherein L denotes an integer of 0 to 5, or ##STR5## wherein m denotes an integer of 1 to 6; a, b and c independently of one another represent a real number of 3 or less, provided that they satisfy the conditions of0<a.ltoreq.3, 0.ltoreq.b and/or c<3 and a+b+c=3.which shows permanent antistatic property by introducing therein an acrylate moiety having quaternary ammonium group and hydroxy group simultaneously, and to a process for preparing thereof.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: December 30, 1997
    Assignee: Hanwha Chemical Corporation
    Inventors: Sang-Keun Kim, Haeng-Woo Lee, Cheol-Kyu Choi, Jeong-Deuk Kim, Jin-Who Hong, Chang-Soo Kim, Kong-Hyun Whang