Patents by Inventor Naoshi Takemura

Naoshi Takemura 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).

  • Direct smelting process with a thermal plasma
    Patent number: 5244488
    Abstract: The present invention relates to a process for directly smelting ores, metal oxides or the like with a thermal plasma.The direct smelting process of the invention can be practiced easily by simple equipment regardless of the form of the material to be smelted without using any plasma forming gas.The present process is characterized in that a polyphase current voltage is applied to a multiplicity of graphite electrodes to cause arc discharge in air and produce a strongly reducing nontransferred plasma arc due to the resulting oxidation decomposition of the graphite electrodes. The plasma arc is jetted out from the tips of the electrodes directly against the material to be smelted.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: September 14, 1993
    Assignee: Manyo Kogyo Kabushiki Kaisha
    Inventors: Ryoda Sato, Kichinosuke Shoji, Naoshi Takemura