Patents by Inventor Jong Kwon CHUNG

Jong Kwon CHUNG 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: 10294550
    Abstract: Heat resistant spheroidal graphite cast iron having an improved high temperature tensile strength includes carbon (C) in a range of 3.2-3.4 wt %, silicon (Si) in a range of 4.3-4.8 wt %, manganese (Mn) in a range of 0.2-0.3 wt %, molybdenum (Mo) in a range of 0.8-1.0 wt %, vanadium (V) in a range of 0.4-0.6 wt %, chrome (Cr) in a range of 0.2-0.4 wt %, niobium (Nb) in a range of 0.2-0.4 wt %, inevitable impurities, and a remainder of iron (Fe) based on a total weight of the heat resistant spheroidal graphite cast iron. The heat resistant spheroidal graphite cast iron further includes barium (Ba) in a range of 0.0045-0.0075 wt %. A content ratio of chrome (Cr) and barium (Ba) (Cr/Ba) is in a range from about 26 to about 89.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: May 21, 2019
    Assignee: DOOSAN INFRACORE CO., LTD
    Inventors: Young-Kyu Ju, Ki-Hwan Jung, Jong-Kwon Chung, Sik Yang, Jae-Hyoung Hwang, Dong-Seob Shim, Sang-Beom Kim
  • Patent number: 10030289
    Abstract: A spheroidal graphite cast iron for a component of an engine exhaust system includes carbon ranging from about 3.0 wt % to about 3.4 wt %, silicon ranging from about 4.2 wt % to about 4.5 wt %, manganese ranging from about 0.1 wt % to about 0.3 wt %, sulfur ranging from about 0.002 wt % to about 0.01 wt %, phosphorous in a range equal to or less than about 0.05 wt %, magnesium ranging from about 0.035 wt % to about 0.055 wt %, molybdenum ranging from about 0.9 wt % to about 1.2 wt %, nickel ranging from about 0.2 wt % to about 0.5 wt %, vanadium ranging from about 0.4 wt % to about 0.6 wt %, niobium ranging from about 0.1 wt % to about 0.4 wt %, cerium ranging from about 0.005 wt % to about 0.01 wt %, aluminum ranging from about 0.003 wt % to about 0.007 wt %, and a remainder of iron.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: July 24, 2018
    Assignee: DOOSAN INFRACORE CO., LTD.
    Inventors: Ki-Hwan Jung, Young-Kyu Ju, Jong-Kwon Chung, Jae-Hyoung Hwang, Sik Yang, Dong-Seob Shim, Sang-Beom Kim
  • Patent number: 9719157
    Abstract: The present disclosure relates to a manufacturing method of high-strength flake graphite cast iron, the high-strength flake graphite cast iron manufactured by the method, and an engine body including the cast iron, and more particularly, to flake graphite cast iron and a manufacturing method thereof, wherein the flake graphite cast iron has a uniform graphite shape and low probability of forming chill and has high tensile strength of at least 350 MPa and excellent workability and fluidity by controlling the content of manganese (Mn) and a trace of strontium (Sr), which are included in the cast iron, within a specific ratio.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: August 1, 2017
    Assignee: Doosan Infracore Co., Ltd.
    Inventors: Ki Hwan Jung, Sik Yang, Jae Hyoung Hwang, Young Kyu Ju, Jong Kwon Chung, Yeniseul Lee, Dong Seob Shim
  • Patent number: 9689059
    Abstract: The present disclosure relates to flake graphite cast iron having high workability and a preparation method thereof, and more particularly, to flake graphite cast iron with a uniform graphite shape, low chill formability, a high strength such as a tensile strength of 350 MPa or more, and excellent workability and fluidity by controlling each of the contents of manganese (Mn) and sulfur (S) and carbon (C) and silicon (Si) included in the cast iron and a carbon equivalent (CE) to predetermined ratios, and a preparation method thereof.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: June 27, 2017
    Assignee: Doosan Infracore Co., Ltd.
    Inventors: Jong Kwon Chung, Sik Yang, Ki Hwan Jung, Jae Hyoung Hwang
  • Publication number: 20170073798
    Abstract: Heat resistant spheroidal graphite cast iron having an improved high temperature tensile strength includes carbon (C) in a range of 3.2-3.4 wt %, silicon (Si) in a range of 4.3-4.8 wt %, manganese (Mn) in a range of 0.2-0.3 wt %, molybdenum (Mo) in a range of 0.8-1.0 wt %, vanadium (V) in a range of 0.4-0.6 wt %, chrome (Cr) in a range of 0.2-0.4 wt %, niobium (Nb) in a range of 0.2-0.4 wt %, inevitable impurities, and a remainder of iron (Fe) based on a total weight of the heat resistant spheroidal graphite cast iron. The heat resistant spheroidal graphite cast iron further includes barium (Ba) in a range of 0.0045-0.0075 wt %. A content ratio of chrome (Cr) and barium (Ba) (Cr/Ba) is in a range from about 26 to about 89.
    Type: Application
    Filed: February 6, 2015
    Publication date: March 16, 2017
    Inventors: Young-Kyu JU, Ki-Hwan JUNG, Jong-Kwon CHUNG, Sik YANG, Jae-Hyoung HWANG, Dong-Seob SHIM, Sang-Beom KIM
  • Publication number: 20170016098
    Abstract: A spheroidal graphite cast iron for a component of an engine exhaust system includes carbon ranging from about 3.0 wt % to about 3.4 wt %, silicon ranging from about 4.2 wt % to about 4.5 wt %, manganese ranging from about 0.1 wt % to about 0.3 wt %, sulfur ranging from about 0.002 wt % to about 0.01 wt %, phosphorous in a range equal to or less than about 0.05 wt %, magnesium ranging from about 0.035 wt % to about 0.055 wt %, molybdenum ranging from about 0.9 wt % to about 1.2 wt %, nickel ranging from about 0.2 wt % to about 0.5 wt %, vanadium ranging from about 0.4 wt % to about 0.6 wt %, niobium ranging from about 0.1 wt % to about 0.4 wt %, cerium ranging from about 0.005 wt % to about 0.01 wt %, aluminum ranging from about 0.003 wt % to about 0.007 wt %, and a remainder of iron.
    Type: Application
    Filed: February 6, 2015
    Publication date: January 19, 2017
    Inventors: Ki-Hwan JUNG, Young-Kyu JU, Jong-Kwon CHUNG, Jae-Hyoung HWANG, Sik YANG, Dong-Seob SHIM, Sang-Beom KIM
  • Publication number: 20150368763
    Abstract: The present disclosure relates to a manufacturing method of high-strength flake graphite cast iron, the high-strength flake graphite cast iron manufactured by the method, and an engine body including the cast iron, and more particularly, to flake graphite cast iron and a manufacturing method thereof, wherein the flake graphite cast iron has a uniform graphite shape and low probability of forming chill and has high tensile strength of at least 350 MPa and excellent workability and fluidity by controlling the content of manganese (Mn) and a trace of strontium (Sr), which are included in the cast iron, within a specific ratio.
    Type: Application
    Filed: January 6, 2014
    Publication date: December 24, 2015
    Inventors: Ki Hwan JUNG, Sik YANG, Jae Hyoung HWANG, Young Kyu JU, Jong Kwon CHUNG, Yeniseul LEE, Dong Seob SHIM
  • Publication number: 20140286819
    Abstract: The present disclosure relates to flake graphite cast iron having high workability and a preparation method thereof, and more particularly, to flake graphite cast iron with a uniform graphite shape, low chill formability, a high strength such as a tensile strength of 350 MPa or more, and excellent workability and fluidity by controlling each of the contents of manganese (Mn) and sulfur (S) and carbon (C) and silicon (Si) included in the cast iron and a carbon equivalent (CE) to predetermined ratios, and a preparation method thereof.
    Type: Application
    Filed: March 20, 2014
    Publication date: September 25, 2014
    Applicant: DOOSAN INFRACORE CO., LTD.
    Inventors: Jong Kwon CHUNG, Sik YANG, Ki Hwan JUNG, Jae Hyoung HWANG