Patents by Inventor Young Jae Han

Young Jae Han 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).

  • Catalyst for hydrogenation of aromatic compound and preparation method therefor
    Patent number: 11925920
    Abstract: The present invention relates to a catalyst for hydrogenation of an aromatic compound, which is capable of greatly reducing the inactivation of a catalyst by using a support including a magnesium-based spinel structure, and a preparation method therefor.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: March 12, 2024
    Assignee: HANWHA CHEMICAL CORPORATION
    Inventors: Eung Gyu Kim, Won Yong Kim, Jeong Hwan Chun, Young Jin Cho, Joung Woo Han, Hyo Suk Kim, Wan Jae Myeong, Ki Taeg Jung
  • HIGH FREQUENCY TRANSFORMER FOR REDUCING LEAKAGE FLUX
    Publication number: 20150222188
    Abstract: Disclosed is a high frequency transformer for reducing leakage flux, including a voltage transformation unit for transforming a first voltage, which is inputted thereto, into a second voltage, wherein: a primary winding is divided; and a secondary winding is arranged between the divided primary windings.
    Type: Application
    Filed: December 22, 2014
    Publication date: August 6, 2015
    Inventors: Jeong Min JO, Young Jae HAN, Chang Young LEE, Hyun Seung JEONG, Sung Il SEO
  • Electrical inertial load controlling apparatus having gate drive for protecting IGBT
    Patent number: 7042691
    Abstract: The present invention provides a gate drive for protecting a switching element (IGBT) used for an electrical inertial load controller. A high-voltage IGBT is used as the switching element and an hcp1316j is used as the gate drive of the IGBT, to restrict overvoltage and overcurrent generated in the event of inverter switching, preventing destruction of the IGBT in advance. Furthermore, an RC filter is formed in close proximity to the IGBT to minimize an erroneous switching operation due to harmonics generated caused by noise in case of inverter switching to improve the system reliability and block an increase in abnormal voltage applied across the switching element.
    Type: Grant
    Filed: December 24, 2001
    Date of Patent: May 9, 2006
    Assignee: Korea Railroad Research Institute
    Inventors: Gil Dong Kim, Young Jae Han, Hyun Jun Park, Sung Kyou Choi, Jung Min Cho
  • Electrical inertial load controlling apparatus having gate drive for proctecting igbt
    Publication number: 20040136131
    Abstract: The present invention provides a gate drive for protecting a switching element (IGBT) used for an electrical inertial load controller. A high-voltage IGBT is used as the switching element and an hcp1316j is used as the gate drive of the IGBT, to restrict overvoltage and overcurrent generated in the event of inverter switching, preventing destruction of the IGBT in advance. Furthermore, an RC filter is formed in close proximity to the IGBT to minimize an erroneous switching operation due to harmonics generated caused by noise in case of inverter switching to improve the system reliability and block an increase in abnormal voltage applied across the switching element.
    Type: Application
    Filed: March 1, 2004
    Publication date: July 15, 2004
    Inventors: Gil Dong Kim, Young Jae Han, HyunJun Park, Sung Kyou Choi, Jung Min Cho