Patents by Inventor Shugo Komatsubara

Shugo Komatsubara 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).

  • Cold die steel excellent in characteristic of suppressing dimensional change
    Patent number: 8815147
    Abstract: A cold die steel excellent in the characteristic of suppressing dimensional change, which has a chemical composition in mass %: C: 0.7% or more and less than 1.6%, Si: 0.5 to 3.0%, Mn: 0.1 to 3.0%, P: less than 0.05% including 0%, S: 0.01 to 0.12%, Cr: 7.0 to 13.0%, one or two elements selected from the group consisting of Mo and W: amounts satisfying the formula (Mo+(W/2))=0.5 to 1.7%, V: less than 0.7% including 0, Ni: 0.3 to 1.5%, Cu: 0.1 to 1.0% and Al: 0.1 to 0.7%. Preferably, the die steel satisfies the formula in mass %: Ni/Al=1 to 3.7. It is preferred that the die steel also satisfies the following formula in mass %: (Cr?4.2×C)=5 or less and (Cr?6.3×C)=1.4 or more and that it contains 0.3% or less of Nb.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: August 26, 2014
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kunichika Kubota, Hideshi Nakatsu, Shugo Komatsubara
  • COLD DIE STEEL EXCELLENT IN CHARACTERISTIC OF SUPPRESSING DIMENSIONAL CHANGE
    Publication number: 20090120540
    Abstract: A cold die steel excellent in the characteristic of suppressing dimensional change, which has a chemical composition in mass %: C: 0.7% or more and less than 1.6%, Si: 0.5 to 3.0%, Mn: 0.1 to 3.0%, P: less than 0.05% including 0%, S: 0.01 to 0.12%, Cr: 7.0 to 13.0%, one or two elements selected from the group consisting of Mo and W: amounts satisfying the formula (Mo+(W/2))=0.5 to 1.7%, V: less than 0.7% including 0, Ni: 0.3 to 1.5%, Cu: 0.1 to 1.0% and Al: 0.1 to 0.7%. Preferably, the die steel satisfies the formula in mass %: Ni/Al=1 to 3.7. It is preferred that the die steel also satisfies the following formula in mass %: (Cr?4.2×C)=5 or less and (Cr?6.3×C)=1.4 or more and that it contains 0.3% or less of Nb.
    Type: Application
    Filed: December 24, 2008
    Publication date: May 14, 2009
    Applicant: Hitachi Metals, Ltd.
    Inventors: Kunichika Kubota, Hideshi Nakatsu, Shugo Komatsubara
  • Cold die steel excellent in characteristic of suppressing dimensional change
    Publication number: 20060251537
    Abstract: A cold die steel excellent in the characteristic of suppressing dimensional change, which has a chemical composition in mass %: C: 0.7% or more and less than 1.6%, Si: 0.5 to 3.0%, Mn: 0.1 to 3.0%, P: less than 0.05% including 0%, S: 0.01 to 0.12%, Cr: 7.0 to 13.0%, one or two elements selected from the group consisting of Mo and W: amounts satisfying the formula (Mo+(W/2))=0.5 to 1.7%, V: less than 0.7% including 0, Ni: 0.3 to 1.5%, Cu: 0.1 to 1.0% and Al: 0.1 to 0.7%. Preferably, the die steel satisfies the formula in mass %: Ni/Al=1 to 3.7. It is preferred that the die steel also satisfies the following formula in mass %: (Cr?4.2 ×C)=5 or less and (Cr?6.3×C)=1.4 or more and that it contains 0.3% or less of Nb.
    Type: Application
    Filed: December 19, 2003
    Publication date: November 9, 2006
    Inventors: Kunichika Kubota, Hideshi Nakatsu, Shugo Komatsubara