Patents by Inventor Kazuo Funato

Kazuo Funato 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).

  • Building construction steel having excellent fire resistance and low yield ratio
    Patent number: 5147474
    Abstract: Disclosed is a process for manufacturing a building construction steel having excellent high-temperature characteristics, which can be marketed at an economically reasonable price. According to this process, a slab having a steel composition in which appropriate amounts of Mo and Nb are added to a low-C and low-Mn steel is heated at a high temperature and rolling is finished at a relatively high temperature, or a slab having a steel composition in which an appropriate amount of Mo is added to a low-C and low-Mn steel composition is heated at a high temperature, rolling is finished at a relatively high temperature, and at the subsequent air-cooling step, water cooling is started at a temperature of a ferrite fraction of 20 to 50% during the transformation from austenite to ferrite, water cooling is carried out to an arbitrary temperature lower than 550.degree. C., followed by air cooling.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: September 15, 1992
    Assignee: Nippon Steel Corporation
    Inventors: Hiroshi Tamehiro, Rikio Chiziiwa, Yoshifumi Sakumoto, Kazuo Funato, Yuzuru Yoshida, Koichiro Keira
  • Process for manufacturing building construction steel having excellent fire resistance and low yield ratio
    Patent number: 4990196
    Abstract: Disclosed is a process for manufacturing a building construction steel having excellent high-temperature characteristics, which can be marketed at an economically reasonable price. According to this process, a slab having a steel composition in which appropriate amounts of Mo and Nb are added to a low-C and low-Mn steel is heated at a high temperature and rolling is finished at a relatively high temperature, or a slab having a steel composition in which an appropriate amount of Mo is added to a low-C and low-Mn steel composition is heated at a high temperature, rolling is finished at a relatively high temperature, and at the subsequent air-cooling step, water cooling is started at a temperature of a ferrite fraction of 20 to 50% during the transformation from austenite to ferrite, water cooling is carried out to an arbitrary temperature lower than 550.degree. C., followed by air cooling.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: February 5, 1991
    Assignee: Nippon Steel Corporation
    Inventors: Hiroshi Tamehiro, Rikio Chiziiwa, Yoshifumi Sakumoto, Kazuo Funato, Yuzuru Yoshida, Koichiro Keira