Patents by Inventor Kazuki Ohtoh

Kazuki Ohtoh 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).

  • Glass-ceramic and reflecting mirror substrate
    Patent number: 6652973
    Abstract: The present invention provides a glass-ceramic suitable as a material for forming a reflecting mirror substrate. The glass-ceramic has celsian as a primary crystal phase and contains SiO2, Al2O3, BaO, and TiO2 as primary components and at least Li2O as a modification component, wherein the amount of Li2O is within a range of 0.05 to 1.0 wt. %. The glass-ceramic is substantially formed of a crystal phase of celsian alone, that is, the glass-ceramic is substantially free from hexacelsian crystal phase.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: November 25, 2003
    Assignee: NGK Insulators, Ltd.
    Inventors: Takashi Ota, Atushi Watanabe, Kazuki Ohtoh
  • Glass-ceramic and reflecting mirror substrate
    Publication number: 20030129414
    Abstract: An object of the present invention is to provide a glass-ceramic which is suitable as a material for forming a reflecting mirror substrate.
    Type: Application
    Filed: July 15, 2002
    Publication date: July 10, 2003
    Applicant: NGK Insulators, Ltd.
    Inventors: Takashi Ota, Atushi Watanabe, Kazuki Ohtoh