Patents by Inventor Joon Keun Woo

Joon Keun Woo 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: 12227602
    Abstract: The present invention relates to a high-melt-strength polypropylene resin, and a preparation method therefor. A method for preparing the high-melt-strength polypropylene resin, according to the present invention, comprises the steps of: creating a polypropylene by polymerizing propylene monomers in the presence of a metallocene catalyst; and putting a diene compound and a comonomer into the created polypropylene and unreacted propylene monomers and reacting same, thereby forming a C40 or greater long-chain branch on the main chain of the polypropylene.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: February 18, 2025
    Assignee: LOTTE CHEMICAL CORPORATION
    Inventors: Su-Jeong Jeong, Hyun-Yul Woo, Joon-Keun Min, Rai-Ha Lee, Eun-Hye Shin, Byung-Hun Chae
  • Publication number: 20230022912
    Abstract: The present invention may provide a motor including a shaft, a rotor coupled to the shaft, and a stator disposed to correspond to the rotor, wherein the rotor includes a first rotor core and a second rotor core arranged in an axial direction, a first magnet disposed on an outer circumferential surface of the first rotor core, a second magnet disposed on an outer circumferential surface of the second rotor core, a first cover disposed outside the first magnet, and a second cover disposed outside the second magnet, a spacer is disposed between the first rotor core and the second rotor core, an end of the first cover and an end of the second cover are disposed with a gap therebetween in the axial direction, and a thickness of the spacer in the axial direction is greater than or at least equal to a size of the gap so that the first magnet and the second magnet do not overlap the gap in a radial direction.
    Type: Application
    Filed: December 23, 2020
    Publication date: January 26, 2023
    Inventors: Joon Keun WOO, Sung Joo OH
  • Patent number: 9455602
    Abstract: A motor includes a stator having a ring type structure and including a plurality of teeth protruding toward an inner surface of the stator and coils wound around the teeth; and a rotor including a core with a plurality of permanent magnets circumferentially magnetized inside the stator around a rotation shaft and a non-magnetic member between the core and the rotation shaft, and the permanent magnet includes a protrusion protruding to the non-magnetic member. An area of the permanent magnet is increased by increasing a length of the permanent magnet so that a magnetic flux can be increased to increase a torque.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: September 27, 2016
    Assignees: LG INNOTEK CO., LTD., Industry-University Cooperation Foundation Hanyang University
    Inventors: Joon Keun Woo, Jung Pyo Hong, Kang Il Park
  • Publication number: 20150162791
    Abstract: A rotor may include a non-magnetic member including a through hole in which a rotational shaft is inserted, a plurality of core members received in the non-magnetic member and arranged radially with respect to the through hole to form pockets, and a plurality of magnets inserted in the pockets. An outer circumferential surface of the magnet is covered with the non-magnetic member. A motor including such rotor may be achieved.
    Type: Application
    Filed: December 8, 2014
    Publication date: June 11, 2015
    Inventor: Joon Keun WOO
  • Publication number: 20140191609
    Abstract: A motor includes a stator having a ring type structure and including a plurality of teeth protruding toward an inner surface of the stator and coils wound around the teeth; and a rotor including a core with a plurality of permanent magnets circumferentially magnetized inside the stator around a rotation shaft and a non-magnetic member between the core and the rotation shaft, and the permanent magnet includes a protrusion protruding to the non-magnetic member. An area of the permanent magnet is increased by increasing a length of the permanent magnet so that a magnetic flux can be increased to increase a torque.
    Type: Application
    Filed: January 9, 2014
    Publication date: July 10, 2014
    Applicants: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY, LG INNOTEK CO., LTD.
    Inventors: Joon Keun WOO, Jung Pyo HONG, Kang Il PARK
  • Patent number: 8074238
    Abstract: Provided is a spindle motor. The spindle motor includes a rotatable shaft, a stator, a rotor, and a turntable. The stator is positioned around the shaft. The rotor includes a rotor yoke coupled to the shaft. The rotor is rotated with the shaft integratedly by a reaction with the stator. The turntable is coupled to the shaft. The rotor yoke and the turntable are coupled to each other and are fixed to the shaft.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: December 6, 2011
    Assignee: LG Innotek Co., Ltd.
    Inventor: Joon Keun Woo
  • Publication number: 20090150915
    Abstract: Provided is a spindle motor. The spindle motor includes a rotatable shaft, a stator, a rotor, and a turntable. The stator is positioned around the shaft. The rotor includes a rotor yoke coupled to the shaft. The rotor is rotated with the shaft integratedly by a reaction with the stator. The turntable is coupled to the shaft. The rotor yoke and the turntable are coupled to each other and are fixed to the shaft.
    Type: Application
    Filed: December 8, 2008
    Publication date: June 11, 2009
    Inventor: Joon Keun Woo