Patents Assigned to Daidotokushijo Kabushikikaisha
  • DC arc furnace
    Patent number: 4947405
    Abstract: An upper electrode is mounted in the upper portion of a furnace and a bottom electrode is mounted in a bottom of the furnace. An electric arc is generated by introducing electric current to the upper and bottom electrodes and the raw materials charged in the furnace is melted. In the process of melting the materials, a mist of cooling water is sprayed by spray nozzles directly against the lower portion of the bottom electrode extruding downwards and the bottom electrode is cooled by the mist.
    Type: Grant
    Filed: May 24, 1989
    Date of Patent: August 7, 1990
    Assignee: Daidotokushijo Kabushikikaisha
    Inventor: Takeshi Okada