Patents by Inventor Chong-Sool Choi

Chong-Sool 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 vibration damping alloy steel and a method for making the same
    Patent number: 5634990
    Abstract: An Fe-Mn vibration damping alloy steel having a mixture structure of .epsilon., .alpha.' and .gamma.. The alloy steel consists of iron, manganese from 10 to 24% by weight and limited amounts of impurities. The alloy steel is manufactured by preparing an ingot at a temperature of 1000.degree. C. to 1300.degree. C. for 12 to 40 hours to homogenize the ingot and hot-rolling the homogenized ingot to produce a rolled alloy bar or plate, performing solid solution treatment on the alloy steel at 900.degree. C. to 1100.degree. C. for 30 to 60 minutes, cooling the alloy steel by air or water, and cold rolling the alloy steel at a reduction rate of greater than 0% and below 30% at around room temperature.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: June 3, 1997
    Assignee: Woojin Osk Corporation
    Inventors: Chong-Sool Choi, Man-Eob Lee, Seung-Han Baek, Yong-Chul Son, Jeong-Cheol Kim, Joong-Hwan Jun, Young-Sam Ko