Patents by Inventor Jong-Sul Choi

Jong-Sul Choi 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).

  • Fe-Mn group vibration damping alloy manufacturing method thereof
    Patent number: 5290372
    Abstract: A vibration damping alloy has a mixed structure of martensite and austenite. The alloy steel is iron-based to which 14-22% by weight of manganese is added. The vibration damping alloy is manufactured by mixing electrolytic iron and manganese in a molten state. The molten mixture, containing 14-22% of manganese with the remainder of iron, is cast as an ingot. The ingot is homogenized at 1000.degree.-1300.degree. C. for 20-40 hours and then hot rolled at 900.degree.-1100.degree. C. for 20 minutes to 90 minutes. The ingot is cooled with air or water.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: March 1, 1994
    Assignee: Woojin Osk Corporation
    Inventors: Jong-Sul Choi, Seung-Han Baek, Jun-Dong Kim