Patents by Inventor Seiji Eiro

Seiji Eiro 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).

  • Process for producing a high tension steel sheet product having an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher
    Patent number: 4105474
    Abstract: The production process characterized in that a steel ingot or slab containing not less than 0.004% of TiN not larger than 0.02.mu. is heated to a temperature not higher than 1150.degree. C and rolled, and growth of the .gamma. grains during this heating and rolling step is prevented by TiN to improve the toughness, and the resultant steel product has an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher, and is useful as hot rolled or as heated at a temperature ranging from 300.degree. to 750.degree. C after the hot rolling.
    Type: Grant
    Filed: April 12, 1977
    Date of Patent: August 8, 1978
    Assignee: Nippon Steel Corporation
    Inventors: Hajime Nakasugi, Hiroaki Masui, Hiroshi Tamehiro, Tetuo Takeda, Seiji Eiro
  • Process for producing a high tension steel sheet product having an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher
    Patent number: RE31251
    Abstract: The production process characterized in that a steel ingot or slab containing not less than 0.004% of TiN not larger than 0.02.mu. is heated to a temperature not higher than 1150.degree. C. and rolled, and growth of the .gamma. grains during this heating and rolling step is prevented by TiN to improve the toughness, and the resultant steel product has an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher, and is useful as hot rolled or as heated at a temperature ranging from 300.degree. to 750.degree. C. after the hot rolling.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: May 24, 1983
    Assignee: Nippon Steel Corporation
    Inventors: Hajime Nakasugi, Hiroaki Masui, Hiroshi Tamehiro, Tetuo Takeda, Seiji Eiro