Patents by Inventor Takeo Dazai

Takeo Dazai 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 for cooling a steel strip in a continuous annealing furnace
    Patent number: 4725321
    Abstract: The present invention relates to a method for cooling a steel strip in a continuous-annealing furnace. Conventionally, the steel strip is cooled by a water medium and, thus, oxidation is inevitable. Recently developed roll cooling methods can prevent oxidation but are disadvantageous in that the steel strip (1) is nonuniformly cooled as seen in its short width direction.The present invention attains uniform cooling by means of feedback-feedforward control, in which the blowing width of the gas-jet cooler (21, 53) is controlled by detecting the sheet temperature distribution with thermometers (24, 55, 60).
    Type: Grant
    Filed: January 9, 1986
    Date of Patent: February 16, 1988
    Assignee: Nippon Steel Corporation
    Inventors: Hiroshi Ikegami, Katsuhiko Yui, Tadashige Namba, Yasuo Misawa, Takeo Dazai, Yoshio Saitoh
  • Method for cooling a steel strip in a continuous annealing furnace
    Patent number: 4724014
    Abstract: The present invention relates to a method for cooling a steel strip in a continuous-annealing furnace. Conventionally, the steel strip is cooled by a water medium and, thus, oxidation is inevitable. Recently developed roll cooling methods can prevent oxidation but are disadvantageous in that the steel strip is non-uniformly cooled as seen in its short width direction.The present invention attains uniform cooling by means of feedback control, in which the blowing width of the gas-jet cooler (21) is controlled by detecting the sheet temperature distribution with a thermometer (24, 60).
    Type: Grant
    Filed: January 9, 1986
    Date of Patent: February 9, 1988
    Assignee: Nippon Steel Corporation
    Inventors: Yasuo Misawa, Takeo Dazai, Tsutomu Haeno, Yoshio Saitoh, Masanori Shimada