Patents by Inventor Minoru Ususaka

Minoru Ususaka 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).

  • Gas introducing and stirring apparatus of metallurgical vessel
    Patent number: 5257280
    Abstract: The present invention has been devised to obtain a metallurgical effect by introducing refining gas into a molten metal in a metallurgical vessel and stirring the molten metal sufficiently by convection, and to improve durability of one nozzle or a few nozzles for introducing the refining gas. At a predetermined position of a furnace bottom onto which a ramming mass is provided, a few cylindrical refractory sleeves are disposed close to the upper face of the furnace bottom from the lower portion thereof. In each cylindrical refractory sleeve a gas introducing nozzle, which introduces the refining gas, is disposed in such a manner that it can be drawn out downwardly for replacement.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: October 26, 1993
    Assignee: Kawasaki Refractories Co., Ltd.
    Inventors: Nobuyuki Mimura, Minoru Ususaka