Patents by Inventor Wataru Utsumi

Wataru Utsumi 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).

  • Process for producing single-crystal gallium nitride
    Patent number: 7294198
    Abstract: A process for producing single-crystal gallium nitride comprising the steps of performing congruent melting of gallium nitride at a high pressure between 6×104 atm. and 10×104 atm. and at a high temperature between 2,200° C. and 2,500° C. and then slowly cooling the obtained gallium nitride melt at the stated high pressure.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: November 13, 2007
    Assignee: Japan Atomic Energy Research Institute
    Inventors: Wataru Utsumi, Hiroyuki Saitoh, Katsutoshi Aoki
  • Process for producing single-crystal gallium nitride
    Publication number: 20050098089
    Abstract: A process for producing single-crystal gallium nitride comprising the steps of performing congruent melting of gallium nitride at a high pressure between 6×104 atm. and 10×104 atm. and at a high temperature between 2,200° C. and 2,500° C. and then slowly cooling the obtained gallium nitride melt at the stated high pressure.
    Type: Application
    Filed: July 16, 2004
    Publication date: May 12, 2005
    Applicant: Japan Atomic Energy Research Institute
    Inventors: Wataru Utsumi, Hiroyuki Saitoh, Katsutoshi Aoki
  • Method of producing a graphite monochromator for X-rays and neutrons
    Patent number: 4842665
    Abstract: A graphite monochromator for X-rays and neutrons which uses a graphitized product obtained by graphitizing a polymer film in an inert atmosphere at a temperature of 2,000.degree. to 3,500.degree. C., which has an extremely excellent plane orientation, and has an excellent smoothness and a mosaic spread of 4.degree. or less.
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: June 27, 1989
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Satoshi Taguchi, Wataru Utsumi