Patents by Inventor Shojiro Naito

Shojiro Naito 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).

  • Continuous casting nozzle for casting molten steel
    Patent number: 5911900
    Abstract: The invention is related to a continuous casting nozzle for casting of aluminum killed steel without clogging of the bore of the nozzle. The surface layer of the bore of the continuous casting nozzle contacting with the molten steel is formed of a refractory comprising graphite from 10 to 35 wt %, an aggregate of 10 to 60 wt % selected from alumina matter, zirconia matter, zircon matter, or alumina-silica matter and roseki containing the pyrophyllite (Al.sub.2 O.sub.3 .multidot.4SiO.sub.2 .multidot.H.sub.2 O) as the main component as the remaining part of the above mentioned materials.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: June 15, 1999
    Assignee: Akechi Ceramics
    Inventors: Toshiyuki Muroi, Shojiro Naito