Patents by Inventor Shunichi Hishita

Shunichi Hishita 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).

  • Method of fixing polarization-reversed region formed in ferroelectric single crystal
    Patent number: 8223427
    Abstract: A method of fixing a polarization-reversed region formed in a ferroelectric single crystal, including preparing a ferroelectric single crystal having a polarization-reversed region; and irradiating an ion beam or a neutral beam on the ferroelectric single crystal. The ferroelectric single crystal is a substantially stoichiometric lithium tantalate single crystal or a substantially stoichiometric lithium niobate single crystal, and the polarization-reversed region is fixed and any back switch and expansion of the polarization-reversed region are suppressed.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: July 17, 2012
    Assignee: National Institute for Materials Science
    Inventors: Xiaoyan Liu, Shunji Takekawa, Kazuya Terabe, Shunichi Hishita, Kenji Kitamura
  • Method of Fixing Polarization-Reversed Region Formed in Ferroelectric Single Crystal and Optical Element Using the Same
    Publication number: 20090231703
    Abstract: A method of fixing polarization-reversed regions formed in a ferroelectric single crystal with ease and an optical element containing such a ferroelectric single crystal are provided. The method of fixing the polarization-reversed regions formed in a ferroelectric single crystal is characterized by including a step of irradiating an ion beam or a neutral beam on the ferroelectric single crystal where polarization-reversed regions are formed. An optical element containing such a ferroelectric single crystal is characterized by being manufactured by a method including such a step.
    Type: Application
    Filed: March 5, 2007
    Publication date: September 17, 2009
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Xiaoyan Liu, Shunji Takekawa, Kazuya Terabe, Shunichi Hishita, Kenji Kitamura