Patents by Inventor Huigai Li

Huigai Li 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).

  • Low carbon steel having improved hardness and methods of making the same
    Patent number: 11761067
    Abstract: Provided herein are techniques for making low-carbon steels with high surface hardness. A technique includes heating a low-carbon steel precursor material in a furnace to form molten steel material, increasing the free oxygen content of the molten steel material to a predetermined level, and then solidifying the molten steel material having the predetermined oxygen level to produce a steel structure by cooling the molten steel material at a predetermined cooling rate. The predetermined oxygen level and the predetermined cooling rate are effective to produce the low-carbon steel with a high surface hardness. The low-carbon steel may have inclusions smaller than about 1 ?m.
    Type: Grant
    Filed: October 14, 2019
    Date of Patent: September 19, 2023
    Assignee: THE FLORIDA STATE UNIVERSITY RESEARCH FOUNDATION, INC.
    Inventors: Huigai Li, Ke Han, Yan Xin, Shaobo Zheng, Liuxing Wang, Qijie Zhai
  • LOW CARBON STEEL HAVING IMPROVED HARDNESS AND METHODS OF MAKING THE SAME
    Publication number: 20200149138
    Abstract: Provided herein are techniques for making low-carbon steels with high surface hardness. A technique includes heating a low-carbon steel precursor material in a furnace to form molten steel material, increasing the free oxygen content of the molten steel material to a predetermined level, and then solidifying the molten steel material having the predetermined oxygen level to produce a steel structure by cooling the molten steel material at a predetermined cooling rate. The predetermined oxygen level and the predetermined cooling rate are effective to produce the low-carbon steel with a high surface hardness. The low-carbon steel may have inclusions smaller than about 1 ?m.
    Type: Application
    Filed: October 14, 2019
    Publication date: May 14, 2020
    Inventors: Huigai Li, Ke Han, Yan Xin, Shaobo Zheng, Liuxing Wang, Qijie Zhai