Patents by Inventor Heung Sub Song

Heung Sub Song 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).

  • Sintering method for tungsten-nickel-manganese type heavy alloy
    Patent number: 5970307
    Abstract: A sintering method for a W--Ni--Mn type heavy alloy, including controlling the deoxidization of tungsten and nickel under an inert atmosphere, changing to a hydrogen atmosphere at above a temperature at which manganese is deoxidized and simultaneously deoxidizing tungsten, nickel and manganese, and sintering by raising the temperature, resulting in the fabrication of a sintered heavy alloy having a 100% relative theoretical density.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: October 19, 1999
    Assignee: Agency for Defense Development
    Inventors: Moon Hee Hong, Woon Hyung Baek, Joon Woong Noh, Heung Sub Song, Seong Lee, Eun Pyo Kim
  • Fabrication method for tungsten heavy alloy
    Patent number: 5956558
    Abstract: A fabrication method for a tungsten heavy alloy includes first fabricating a green compact or a sintered body composed of tungsten and other elements except manganese, then putting manganese thereon, and sintering the tungsten heavy alloy with manganese manganese, whereby the formation of pores, which occurs because manganese is oxidized by the deoxidation of oxides existing on the surface of powders of tungsten, nickel and iron is prevented, and a tungsten heavy alloy having a 100% non-theoretical density of 100% is obtained.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: September 21, 1999
    Assignee: Agency for Defense Development
    Inventors: Moon Hee Hong, Woon Hyung Baek, Joon Woong Noh, Heung Sub Song, Seong Lee, Eun Pyo Kim
  • Irregular shape change of tungsten/matrix interface in tungsten based heavy alloys
    Patent number: 5956559
    Abstract: A method for producing an irregular tungsten/matrix interface in tungsten based heavy alloy is disclosed. The method involves a cyclic heat treatment and resintering at above liquidus temperature for tungsten heavy alloys consisting of 80 to 98 weight % tungsten and remainder of matrix phase. The sintered specimens are cyclically heat treated at above 1000.degree. C. and resintered at liquidus temperature of the matrix phase for one minute to 4 hours at a constant temperature.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: September 21, 1999
    Assignee: Agency for Defense Development
    Inventors: Heung Sub Song, Eun Pyo Kim, Seong Lee, Joon Woong Noh, Moon Hee Hong, Woon Hyung Baek