Patents by Inventor Shohei IKURUMI

Shohei IKURUMI 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).

  • Steel with high hardness and excellent toughness
    Patent number: 11162162
    Abstract: A steel with high hardness and excellent toughness contains, in mass %, 0.40-1.00% C, 0.10-2.00% Si, 0.10-1.00% Mn, 0.030% or less P, 0.030% or less S, 1.10-3.20% Cr, 0.010-0.10% Al, and 0.15-0.50% V, and further contains at least one or two of 2.50% or less Ni and 1.00% or less Mo, with an amount of (C+V) being 0.60% or more in mass %, with the balance consisting of Fe and unavoidable impurities. The steel has a microstructure which is a martensitic structure with finely dispersed Fe-based ? carbides, with its prior austenite grain size being 20 ?m or less.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: November 2, 2021
    Assignees: OSAKA UNIVERSITY, KOMATSU LTD.
    Inventors: Yoritoshi Minamino, Koji Hagihara, Koji Yamamoto, Shohei Ikurumi, Yusuke Hiratsuka, Takeshi Fujimatsu, Toshiyuki Sugimoto
  • Tooth adapter and bucket
    Patent number: 10745891
    Abstract: The tooth adapter partly inserted into a cavity formed in a tooth to hold the tooth with respect to a bucket body includes a connection portion including a proximal end, which is an end of the tooth adapter connected to the bucket body, and an insertion portion including a distal end, which is an end of the tooth adapter inserted into the cavity. The insertion portion includes a base, and a high-hardness portion formed in a region including a surface of the insertion portion, the high-hardness portion being higher in hardness than the base.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: August 18, 2020
    Assignees: KOMATSU LTD., HENSLEY INDUSTRIES, INC.
    Inventors: Shohei Ikurumi, Dan Yumoto, Stanley Ignacio, Takanori Nagata
  • STEEL WITH HIGH HARDNESS AND EXCELLENT TOUGHNESS
    Publication number: 20200080180
    Abstract: A steel with high hardness and excellent toughness contains, in mass %, 0.40-1.00% C, 0.10-2.00% Si, 0.10-1.00% Mn, 0.030% or less P, 0.030% or less S, 1.10-3.20% Cr, 0.010-0.10% Al, and 0.15-0.50% V, and further contains at least one or two of 2.50% or less Ni and 1.00% or less Mo, with an amount of (C+V) being 0.60% or more in mass %, with the balance consisting of Fe and unavoidable impurities. The steel has a microstructure which is a martensitic structure with finely dispersed Fe-based ? carbides, with its prior austenite grain size being 20 ?m or less.
    Type: Application
    Filed: August 8, 2018
    Publication date: March 12, 2020
    Applicants: OSAKA UNIVERSITY, KOMATSU LTD.
    Inventors: Yoritoshi MINAMINO, Koji HAGIHARA, Koji YAMAMOTO, Shohei IKURUMI, Yusuke HIRATSUKA, Takeshi FUJIMATSU, Toshiyuki SUGIMOTO
  • TOOTH ADAPTER AND BUCKET
    Publication number: 20190264425
    Abstract: The tooth adapter partly inserted into a cavity formed in a tooth to hold the tooth with respect to a bucket body includes a connection portion including a proximal end, which is an end of the tooth adapter connected to the bucket body, and an insertion portion including a distal end, which is an end of the tooth adapter inserted into the cavity. The insertion portion includes a base, and a high-hardness portion formed in a region including a surface of the insertion portion, the high-hardness portion being higher in hardness than the base.
    Type: Application
    Filed: February 27, 2018
    Publication date: August 29, 2019
    Applicants: KOMATSU LTD., HENSLEY INDUSTRIES, INC.
    Inventors: Shohei IKURUMI, Dan YUMOTO, Stanley IGNACIO, Takanori NAGATA