Patents by Inventor Hai-Chang Cho

Hai-Chang Cho 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).

  • Process for production of ultra low phosphorous and carbon ferromanganese by using of ferromanganese slag
    Patent number: 8268036
    Abstract: Disclosed is a method of producing ultra low phosphorus and carbon ferromanganese having 0.1 wt % or less carbon and 0.03 wt % or less phosphorus. The method includes preparing low carbon silicomanganese having low phosphorus content, preparing molten manganese slag, subjecting the molten manganese slag and the low carbon silicomanganese having low phosphorus content to primary mixing and stirring at a ratio of 70˜72:28˜30 in a ladle, thus producing a metal melt and slag, and subjecting the metal melt separated from the above slag and the molten manganese slag identical to that used in the primary mixing and stirring to secondary mixing and stirring, thus producing slag and a metal melt including 91˜93 wt % manganese, 0.60˜0.85 wt % silicon, 0.05˜0.10 wt % carbon and 0.015˜0.02 wt % phosphorus.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: September 18, 2012
    Assignee: Dongbu Metal Co., Ltd.
    Inventors: Dong-Shik Min, Chan-Soo Park, Young-Eun Lee, Hai-Chang Cho, Kwang-Jung Lee, Sung-Hwan Hong
  • PROCESS FOR PRODUCTION OF ULTRA LOW PHOSPHOROUS AND CARBON FERROMANGANESE BY USING OF FERROMANGANESE SLAG
    Publication number: 20110265608
    Abstract: Disclosed is a method of producing ultra low phosphorus and carbon ferromanganese having 0.1 wt % or less carbon and 0.03 wt % or less phosphorus. The method includes preparing low carbon silicomanganese having low phosphorus content, preparing molten manganese slag, subjecting the molten manganese slag and the low carbon silicomanganese having low phosphorus content to primary mixing and stirring at a ratio of 70˜72:28˜30 in a ladle, thus producing a metal melt and slag, and subjecting the metal melt separated from the above slag and the molten manganese slag identical to that used in the primary mixing and stirring to secondary mixing and stirring, thus producing slag and a metal melt including 91˜93 wt % manganese, 0.60˜0.85 wt % silicon, 0.05˜0.10 wt % carbon and 0.015˜0.02 wt % phosphorus.
    Type: Application
    Filed: November 19, 2008
    Publication date: November 3, 2011
    Inventors: Dong-Shik Min, Chan-Soo Park, Young-Eun Lee, Hai-Chang Cho, Kwang-Jung Lee, Sung-Hwan Hong