Patents by Inventor Yutaka Mikawa

Yutaka Mikawa 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 NITRIDE CRYSTAL, NITRIDE CRYSTAL AND APPARATUS FOR PRODUCING SAME
    Publication number: 20110268645
    Abstract: To grow a highly pure nitride crystal having a low oxygen concentration efficiently by an ammonothermal method. A process for producing a nitride crystal, which comprises bringing a reactant gas reactive with ammonia to form a mineralizer, and ammonia into contact with each other to prepare a mineralizer in a reactor or in a closed circuit connected to a reactor; and growing a nitride crystal by an ammonothermal method in the presence of the ammonia and the mineralizer.
    Type: Application
    Filed: January 7, 2010
    Publication date: November 3, 2011
    Applicants: TOHOKU UNIVERSITY, MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yutaka Mikawa, Makiko Kiyomi, Yuji Kagamitani, Toru Ishiguro
  • ZINC OXIDE SINGLE CRYSTAL AND METHOD FOR PRODUCING THE SAME
    Publication number: 20110117349
    Abstract: To produce a zinc oxide single crystal having a sufficiently low lithium concentration and a high crystallinity. A zinc oxide crystal is grown by hydrothermal synthesis method using a solution having a lithium concentration of 1 ppm or less (weight basis), while suppressing a fluctuation range of crystal growth temperature within 5° C. or at a temperature within the range of 300 to 370° C.
    Type: Application
    Filed: March 24, 2009
    Publication date: May 19, 2011
    Applicants: Fukuda Crystal Laboratory, Tokyo Denpa Co., Ltd., Mitsubishi Chemical Corporation
    Inventors: Yutaka Mikawa, Keiji Fukutomi, Takao Suzuki, Hirohisa Itoh