Patents by Inventor Naoki Otsuki

Naoki Otsuki 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).

  • Metal heating furnace
    Patent number: 4388068
    Abstract: A heating furnace in which radiant tubes are extended widthwise into the furnace so that the products of combustion are discharged into the furnace, whereby intermediate shapes such as slabs which are transported through the furnace are heated to desired rolling temperatures.
    Type: Grant
    Filed: July 30, 1981
    Date of Patent: June 14, 1983
    Assignees: Ishikawajima-Harima Jukogyo Kabushiki Kaisha, Nippon Steel Corporation
    Inventors: Osamu Takeuchi, Hiroshi Hasegawa, Susumu Izumi, Naoki Otsuki
  • Shaft furnace
    Patent number: 4196893
    Abstract: A shaft reduction furnace is provided with a pressure equalizing chamber for supplying raw materials such as ores in the furnace. The interior of the furnace is separated by a dividing plate into an upper portion and a lower portion. A pipe path through the dividing plate communicates the upper portion with lower portion. The upper portion and the pipe path form an inside ore hopper for supplying ore continuously into the lower portion of the furnace, thus omitting the conventional ore hopper of pressure-proof-structure provided separately outside of the furnace.
    Type: Grant
    Filed: March 15, 1978
    Date of Patent: April 8, 1980
    Assignee: Nippon Steel Corporation
    Inventors: Naoki Otsuki, Katsuyoshi Kobayashi