Patents by Inventor Shigeta Asai

Shigeta Asai 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).

  • Carburizing method and carburizing apparatus
    Patent number: 6846366
    Abstract: There is provided an economical carburizing method and carburization apparatus capable of carrying out carburizing treatment with a quality as high as that in a normal case and a high reproducibility even if carburizing conditions differ from those in a normal case. A carburization apparatus for carrying out carburization in an atmosphere gas containing not more than 30% by volume of carbon monoxide under a pressure of 13 to 4,000 Pa has a carburizing chamber 3 for housing an object 4 to be treated; an oxygen sensor 20 for measuring an oxygen concentration in the atmosphere gas in the carburizing chamber 3 during carburization; and a mass flow controller 5 for adjusting a composition of the atmosphere gas in the carburizing chamber 3 according to a measurement result by the oxygen sensor 20.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: January 25, 2005
    Assignee: Oriental Engineering Co., Ltd.
    Inventors: Kazuki Kawata, Hatsuo Sato, Shigeta Asai, Yoshiyuki Sekiya
  • Carburizing method and carburizing apparatus
    Publication number: 20020134467
    Abstract: There is provided an economical carburizing method and carburization apparatus capable of carrying out carburizing treatment with a quality as high as that in a normal case and a high reproducibility even if carburizing conditions differ from those in a normal case. A carburization apparatus for carrying out carburization in an atmosphere gas containing not more than 30% by volume of carbon monoxide under a pressure of 13 to 4,000 Pa has a carburizing chamber 3 for housing an object 4 to be treated; an oxygen sensor 20 for measuring an oxygen concentration in the atmosphere gas in the carburizing chamber 3 during carburization; and a mass flow controller 5 for adjusting a composition of the atmosphere gas in the carburizing chamber 3 according to a measurement result by the oxygen sensor 20.
    Type: Application
    Filed: January 11, 2002
    Publication date: September 26, 2002
    Inventors: Kazuki Kawata, Hatsuo Sato, Shigeta Asai, Yoshiyuki Sekiya