Patents by Inventor Takuho KUMAGAI

Takuho KUMAGAI 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).

  • Publication number: 20210069767
    Abstract: A method of producing aluminum cans, including an ironing step using an ironing die (30). The ironing die has a carbon film (50) formed as to cover a working surface thereof. The carbon film exhibits a Raman spectrum such that an intensity ratio represented by ID/IG wherein ID is a maximum peak intensity at 1333±10 cm?1 in the Raman spectrum of the surface of said carbon film, and IG is a maximum peak intensity at 1500±100 cm?1 in the Raman spectrum of the surface of said carbon film, is not less than 1.2. The surface of the carbon film is a smooth surface having an arithmetic mean roughness R of not more than 0.05 ?m. Further, the ironing step includes iron-working an aluminum sheet in a dry process using no lubricant while maintaining an ironing ratio in excess of 40%.
    Type: Application
    Filed: November 16, 2020
    Publication date: March 11, 2021
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Takuho Kumagai, Kenichi Takao, Ryozo Shiroishi, Masahiro Shimamura, Naoya Matsumoto
  • Publication number: 20210023603
    Abstract: A metallic worked article suppressing the worked surfaces from being scratched during the plastic work that is conducted aiming at reducing the thickness or decreasing the diameter. The metallic worked article has a reduced thickness or a decreased diameter as obtained through the plastic work, wherein on the worked surface thereof, the ratio Ra1/Ra2 of an arithmetic mean roughness Ra1 measured in a direction at right angles with the direction of working and an arithmetic mean roughness Ra2 measured in the direction of working, is from 0.5 to 1.5.
    Type: Application
    Filed: March 14, 2019
    Publication date: January 28, 2021
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Takuho KUMAGAI, Ryozo SHIROISHI, Naoya MATSUMOTO, Masahiro SHIMAMURA, Tomohiro OGAWA
  • Publication number: 20200071017
    Abstract: An aluminum can wherein, when the light reflected by the outer surface of the body portion of the aluminum can is evaluated based on the LCH method by using a multi-angle spectral colorimeter, the aluminum can features a ratio C15h/C15w of 0.6 to 1.4, the ratio C15h/C15w being that of a saturation value C15h of the light reflected at 15 degrees in the direction of height and a saturation value C15w of the light reflected at an angle 15 of degrees in the circumferential direction based on the light regularly reflected from the light that is incident at 45 degrees in the direction of height and in the circumferential direction.
    Type: Application
    Filed: October 20, 2017
    Publication date: March 5, 2020
    Applicants: TOYO SEIKAN CO., LTD., TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Norihisa HIROTA, Ryozo SHIROISHI, Takuho KUMAGAI, Kenichi TAKAO
  • Publication number: 20180318900
    Abstract: A mold used for blanking a metal plate to shape a blank to be drawn. The mold has a surface treatment film and a top face to be brought into contact with the metal plate and a peripheral end face communicated indirectly with the top face. At least the top face is coated with the surface treatment film.
    Type: Application
    Filed: November 22, 2016
    Publication date: November 8, 2018
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Ryozo SHIROISHI, Kenichi TAKAO, Takuho KUMAGAI
  • Publication number: 20180229287
    Abstract: A die (30) for ironing working, the die (30) having a carbon film 50 covering at least a working surface (41) thereof, the carbon film (50) exhibiting such a Raman spectrum that an intensity ratio represented by the following formula (1): ID/IG??(1) wherein ID is a maximum peak intensity at 1333±10 cm?1 in the Raman spectrum of the surface of the carbon film, and IG is a maximum peak intensity at 1500±100 cm?1 in the Raman spectrum of the surface of the carbon film, is not less than 1.0, and the surface of the carbon film 50 being a smooth surface having an arithmetic mean roughness R of not more than 0.1 ?m.
    Type: Application
    Filed: August 15, 2016
    Publication date: August 16, 2018
    Applicant: TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Takuho KUMAGAI, Kenichi TAKAO, Ryozo SHIROISHI, Masahiro SHIMAMURA, Naoya MATSUMOTO