Patents by Inventor Lee C. Sun

Lee C. Sun 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).

  • Maraging steel having high strength and high toughness
    Patent number: 4710347
    Abstract: Cobalt-free maraging steels consist essentially of 15% to 25% nickel, 2% to 8% tungsten, 0.5% to 2.0% titanium, 0.05% to 0.3% aluminum, and the balance iron so that the maraging steels exhibit a yield strength in the range of 240,000 Psi (1656 Mpa) to 265,000 Psi (1826 Mpa) and a Charpy impact energy of about 25 joules.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: December 1, 1987
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Kim Y. Gil, Lee C. Sun