Patents by Inventor Tomonori Sakuta

Tomonori Sakuta 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).

  • Heat-resistant, austenitic cast steel having excellent machinability and exhaust member made thereof
    Patent number: 9765678
    Abstract: A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100×S+75×Al+0.75×Mn?10×C?2×Nb?0.25×Cr?0.15×Ni?1.2×N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of ?3.0?I?+14.0, and an exhaust member made thereof.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: September 19, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Kana Morishita, Kenichi Inoue, Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta
  • Heat-resistant, cast ferritic steel having excellent machinability and exhaust member made thereof
    Patent number: 9758851
    Abstract: A heat-resistant, cast ferritic steel having excellent machinability comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 0.1-2% of Mn, 1.5% or less of Ni, 16-23% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.05-0.2% of S, and 0.01-0.08% of Al, the balance being Fe and inevitable impurities, and an exhaust member made thereof.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: September 12, 2017
    Assignee: HITACHI METALS, LTD.
    Inventors: Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta, Kana Morishita, Kenichi Inoue
  • HEAT-RESISTANT, CAST FERRITIC STEEL HAVING EXCELLENT MACHINABILITY AND EXHAUST MEMBER MADE THEREOF
    Publication number: 20150275344
    Abstract: A heat-resistant, cast ferritic steel having excellent machinability comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 0.1-2% of Mn, 1.5% or less of Ni, 16-23% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.05-0.2% of S, and 0.01-0.08% of Al, the balance being Fe and inevitable impurities, and an exhaust member made thereof.
    Type: Application
    Filed: October 4, 2013
    Publication date: October 1, 2015
    Applicant: HITACHI METALS, LTD.
    Inventors: Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta, Kana Morishita, Kenichi Inoue
  • HEAT-RESISTANT, AUSTENITIC CAST STEEL HAVING EXCELLENT MACHINABILITY AND EXHAUST MEMBER MADE THEREOF
    Publication number: 20150086412
    Abstract: A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100×S+75×Al+0.75×Mn?10×C?2×Nb?0.25×Cr?0.15×Ni?1.2×N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of ?3.0?I?+14.0, and an exhaust member made thereof.
    Type: Application
    Filed: May 9, 2013
    Publication date: March 26, 2015
    Applicant: HITACHI METALS, LTD.
    Inventors: Kana Morishita, Kenichi Inoue, Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta