Patents by Inventor Hirofumi Kamisugi

Hirofumi Kamisugi 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).

  • Apparatus for steel hardening and process therefor
    Patent number: 5795538
    Abstract: In a method for quenching metal parts, a quenching chamber is provided in which the quenching oil is continuously supplied from below the steel parts and circulated upward through the parts in a laminar flow. The circulation is accomplished by feeding the quenching oil onto the bottom of the quenching chamber of an auxiliary chamber surrounding it.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: August 18, 1998
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Fumitaka Abukawa, Hitoshi Goi, Masahiko Watanabe, Shin Kurasawa, Hirofumi Kamisugi
  • Gas carburizing process and an apparatus therefor
    Patent number: 5676769
    Abstract: A treating material W pre-heated to a carburizing temperature of 750.degree.-950.degree. C. is heat-treated in a carburizing atmosphere directly supplied with hydrocarbon and oxidizing gases and heated to 1000.degree.-1100.degree. C. Then, the treating material W is forcibly cooled to a temperature below 600.degree. C., the treating material W is re-heated to 750.degree.-850.degree. C., and then it is hardened.Energy required to the carburization can be saved because drastic reduction of the treating time is possible.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: October 14, 1997
    Assignee: Dowa Mining Co. Ltd.
    Inventors: Toshiyuki Kawamura, Hitoshi Goi, Atsushi Murayama, Hirofumi Kamisugi