Patents by Inventor Choul Hwan Ham

Choul Hwan Ham 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).

  • Ferrite magnetic substance and method of manufacturing the same
    Patent number: 10388439
    Abstract: Disclosed is a method of manufacturing a ferrite magnetic substance, including: a first mixing operation of providing a first mixture composed of 47 to 49 wt % of Fe, 16 to 18 wt % of Mn, 5.2 to 7.2 wt % of Zn, and a remainder of oxygen and other inevitable impurities, a second mixing operation of providing a second mixture composed of the first mixture and an additive including, based on 100 parts by weight of the first mixture, 28 to 51 ppm of Si, 140 to 210 ppm of Nb and 155 to 185 ppm of Zr, and a finish operation of producing a ferrite magnetic substance by sintering the second mixture.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: August 20, 2019
    Assignees: Hyundai Motor Company, Hyundai Mobis Co., Ltd.
    Inventors: Young Min Kim, Choul Hwan Ham, Kee Yang Lee, Hee Bok Kang
  • FERRITE MAGNETIC SUBSTANCE AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20180096761
    Abstract: Disclosed is a method of manufacturing a ferrite magnetic substance, including: a first mixing operation of providing a first mixture composed of 47 to 49 wt % of Fe, 16 to 18 wt % of Mn, 5.2 to 7.2 wt % of Zn, and a remainder of oxygen and other inevitable impurities, a second mixing operation of providing a second mixture composed of the first mixture and an additive including, based on 100 parts by weight of the first mixture, 28 to 51 ppm of Si, 140 to 210 ppm of Nb and 155 to 185 ppm of Zr, and a finish operation of producing a ferrite magnetic substance by sintering the second mixture.
    Type: Application
    Filed: December 13, 2016
    Publication date: April 5, 2018
    Applicants: HYUNDAI MOTOR COMPANY, HYUNDAI MOBIS CO., LTD.
    Inventors: Young Min Kim, Choul Hwan Ham, Kee Yang Lee, Hee Bok Kang