Patents by Inventor Takehito Itagaki

Takehito Itagaki 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).

  • High-strength and high-ductility die-quenched parts and method of manufacturing the same
    Patent number: 8932416
    Abstract: A high-strength die-quenched part 1 is formed by heating a high-strength steel sheet 11 up to an austenite region, hot stamping and cooling inside a mold, and its microstructure has the martensite wherein carbide particles 2 are finely dispersed over an entire region including prior-austenite grain boundaries. It is desirable that the prior-austenite grain size in the microstructure of the high-strength steel sheet, which is a base material, be 10 ?m or smaller. The high-strength die-quenched part has high-strength and high-ductility thanks to its martensite.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: January 13, 2015
    Assignees: Nissan Motor Co., Ltd., National Institute for Materials Science, Neturen Co., Ltd
    Inventors: Eizaburou Nakanishi, Masayuki Miyake, Kotobu Nagai, Masao Hayakawa, Takehito Itagaki, Takahiko Kanai, Munehisa Hatta, Kazuhiro Kawasaki
  • HIGH-STRENGTH AND HIGH-DUCTILITY DIE-QUENCHED PARTS AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20120118440
    Abstract: A high-strength die-quenched part 1 is formed by heating a high-strength steel sheet 11 up to an austenite region, hot stamping and cooling inside a mold, and its microstructure has the martensite wherein carbide particles 2 are finely dispersed over an entire region including prior-austenite grain boundaries. It is desirable that the prior-austenite grain size in the microstructure of the high-strength steel sheet, which is a base material, be 10 ?m or smaller. The high-strength die-quenched part has high-strength and high-ductility thanks to its martensite.
    Type: Application
    Filed: May 26, 2010
    Publication date: May 17, 2012
    Applicants: NISSAN MOTOR CO., LTD., NETUREN CO., LTD., NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Eizaburou Nakanishi, Masayuki Miyake, Kotobu Nagai, Masao Hayakawa, Takehito Itagaki, Takahiko Kanai, Munehisa Hatta, Kazuhiro Kawasaki