Patents by Inventor Suehisa Sugisaka

Suehisa Sugisaka 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).

  • Method of stress inducing transformation of austenite stainless steel and method of producing composite magnetic members
    Publication number: 20030121567
    Abstract: A method of stress inducing transformation from the austenite phase to the martensite phase by conducting cold working on material of austenite stainless steel in the temperature range from the point Ms to the point Md. The above cold working is a biaxial tensing. An intermediately formed hollow body is made, which includes a ferromagnetic portion and a non-magnetic portion contracting inward. Then, the intermediately formed body is subjected to a stress removing process in which residual tensile stress is removed from an intermediately formed body. In the stress removing process, it is preferable that a punch is press-fitted into the intermediately formed body so as to expand a non-magnetic portion and then the intermediately formed body is drawn with ironing while the punch is inserted so that the residual tensile stress can be changed into the residual compressive stress in the non-magnetic portion.
    Type: Application
    Filed: December 5, 2002
    Publication date: July 3, 2003
    Inventors: Satoshi Sugiyama, Syoichi Takenouchi, Yoshihiro Tanimura, Keizo Takeuchi, Masaki Shimizu, Takashi Ishikawa, Yoshitada Katayama, Hidehito Kito, Suehisa Sugisaka
  • Method of stress inducing transformation of austenite stainless steel and method of producing composite magnetic members
    Patent number: 6521055
    Abstract: A method of stress inducing transformation from the austenite phase to the martensite phase by conducting cold working on material of austenite stainless steel in the temperature range from the point Ms to the point Md. The above cold working is a biaxial tensing. An intermediately formed hollow body is made, which includes a ferromagnetic portion and a non-magnetic portion contracting inward. Then, the intermediately formed body is subjected to a stress removing process in which residual tensile stress is removed from an intermediately formed body. In the stress removing process, it is preferable that a punch is press-fitted into the intermediately formed body so as to expand a non-magnetic portion and then the intermediately formed body is drawn with ironing while the punch is inserted so that the residual tensile stress can be changed into the residual compressive stress in the non-magnetic portion.
    Type: Grant
    Filed: February 3, 2000
    Date of Patent: February 18, 2003
    Assignee: Denso Corporation
    Inventors: Satoshi Sugiyama, Yoshihiro Tanimura, Masaki Shimizu, Yoshitada Katayama, Hidehito Kito, Suehisa Sugisaka
  • Method of stress inducing transformation of austenite stainless steel and method of producing composite magnetic members
    Patent number: 6143094
    Abstract: A method of stress inducing transformation from the austenite phase to the martensite phase by conducting cold working on material of austenite stainless steel in the temperature range from the point Ms to the point Md. The above cold working is a biaxial tensing. An intermediately formed hollow body is made, which includes a ferromagnetic portion and a non-magnetic portion contracting inward. Then, the intermediately formed body is subjected to a stress removing process in which residual tensile stress is removed from an intermediately formed body. In the stress removing process, it is preferable that a punch is press-fitted into the intermediately formed body so as to expand a non-magnetic portion and then the intermediately formed body is drawn with ironing while the punch is inserted so that the residual tensile stress can be changed into the residual compressive stress in the non-magnetic portion.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: November 7, 2000
    Assignee: Denso Corporation
    Inventors: Satoshi Sugiyama, Yoshihiro Tanimura, Masaki Shimizu, Yoshitada Katayama, Hidehito Kito, Suehisa Sugisaka