Patents by Inventor Si-Yup LEE

Si-Yup LEE 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).

  • Tripod joint spider, method of manufacturing the same, and alloy steel applied thereto
    Patent number: 10738832
    Abstract: Disclosed herein are a tripod joint spider, a method of manufacturing the same, and an alloy steel of the tripod joint spider. The method comprises producing a primary molded article using the alloy steel, producing a secondary molded article, hardening the secondary molded article by means of induction hardening, and producing an end product.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: August 11, 2020
    Assignee: Hyundai Motor Company
    Inventor: Si Yup Lee
  • Bearing steel having improved fatigue durability and method of manufacturing the same
    Patent number: 10060014
    Abstract: A bearing steel includes 1.0 to 1.3 wt % carbon; 0.9 to 1.6 wt % silicon; 0.5 to 1.0 wt % manganese; 1.5 to 2.5 wt % nickel; 1.5 to 2.5 wt % chromium; 0.2 to 0.5 wt % molybdenum; 0.01 to 0.06 wt % aluminum; 0.01 to 0.1 wt % copper; at least one selected from the group consisting of more than 0 wt % and less than 0.38 wt % vanadium and more than 0 wt % and less than 0.02 wt % niobium; and a balance of iron.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: August 28, 2018
    Assignee: HYUNDAI MOTOR COMPANY
    Inventors: Sung-Chul Cha, Si-Yup Lee, Young-Sang Ko, Moon-Ki Bae, Seung-Hyun Hong
  • Carburized alloy steel having improved durability and method of manufacturing the same
    Patent number: 9957595
    Abstract: A carburized alloy steel includes, based on a total weight of the carburized alloy steel, 0.1 to 0.35 wt % carbon, 0.1 to 2.0 wt % silicon, 0.1 to 1.5 wt % manganese, 1.5 to 3.0 wt % chromium, 0.2 to 0.5 wt % molybdenum, greater than 0 to 0.07 wt % niobium, and a balance of iron.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 1, 2018
    Assignee: HYUNDAI MOTOR COMPANY
    Inventors: Sung-Chul Cha, Moon-Ki Bae, Seung-Hyun Hong, Si-Yup Lee
  • TRIPOD JOINT SPIDER, METHOD OF MANUFACTURING THE SAME, AND ALLOY STEEL APPLIED THERETO
    Publication number: 20170284476
    Abstract: Disclosed herein are a tripod joint spider, a method of manufacturing the same, and an alloy steel of the tripod joint spider. The method comprises producing a primary molded article using the alloy steel, producing a secondary molded article, hardening the secondary molded article by means of induction hardening, and producing an end product.
    Type: Application
    Filed: July 21, 2016
    Publication date: October 5, 2017
    Inventor: Si Yup Lee
  • ALLOY STEEL FOR HIGH TOUGHNESS CONSTANT VELOCITY JOINT OUTER WHEEL AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20160369363
    Abstract: Alloy steel for a constant velocity joint outer wheel includes, based on a total weight of the alloy steel, 0.50 to 0.60 wt % C (carbon), 0.15 to 0.35 wt % Si (silicon), 0.4 to 0.8 wt % Mn (manganese), more than 0 to 0.03 wt % P (phosphorus), more than 0 to 0.035 wt % S (sulfur), more than 0 to 0.3 wt % Cu (copper), more than 0 to 0.00002 wt % O (oxygen), and a balance of Fe (iron).
    Type: Application
    Filed: November 16, 2015
    Publication date: December 22, 2016
    Inventor: Si-Yup LEE
  • CARBURIZED ALLOY STEEL HAVING IMPROVED DURABILITY AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20160304997
    Abstract: A carburized alloy steel includes, based on a total weight of the carburized alloy steel, 0.1 to 0.35 wt % carbon, 0.1 to 2.0 wt % silicon, 0.1 to 1.5 wt % manganese, 1.5 to 3.0 wt % chromium, 0.2 to 0.5 wt % molybdenum, greater than 0 to 0.07 wt % niobium, and a balance of iron.
    Type: Application
    Filed: October 22, 2015
    Publication date: October 20, 2016
    Inventors: Sung-Chul CHA, Moon-Ki BAE, Seung-Hyun HONG, Si-Yup LEE
  • BEARING STEEL HAVING IMPROVED FATIGUE DURABILITY AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20160145724
    Abstract: A bearing steel includes 1.0 to 1.3 wt % carbon; 0.9 to 1.6 wt % silicon; 0.5 to 1.0 wt % manganese; 1.5 to 2.5 wt % nickel; 1.5 to 2.5 wt % chromium; 0.2 to 0.5 wt % molybdenum; 0.01 to 0.06 wt % aluminum; 0.01 to 0.1 wt % copper; at least one selected from the group consisting of more than 0 wt % and less than 0.38 wt % vanadium and more than 0 wt % and less than 0.02 wt % niobium; and a balance of iron.
    Type: Application
    Filed: October 20, 2015
    Publication date: May 26, 2016
    Inventors: Sung-Chul CHA, Si-Yup LEE, Young-Sang KO, Moon-Ki BAE, Seung-Hyun HONG