Patents by Inventor Testu Ohishi

Testu Ohishi 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).

  • Image display device and Fresnel lens sheet used therefor
    Publication number: 20070146879
    Abstract: A Fresnel lens sheet used for an image display device is disclosed. The Fresnel lens sheet is provided with a first prism group in an area of a light entrance plane of the Fresnel lens sheet where the incident angle of light is equal to or more than a predetermined incident angle and a second prism group in an area of a light entrance plane of the Fresnel lens sheet where the incident angle of light is less than the predetermined value.
    Type: Application
    Filed: June 22, 2006
    Publication date: June 28, 2007
    Applicant: Hitachi, Ltd.
    Inventors: Hiroki Yoshikawa, Takanori Hisada, Testu Ohishi, Koji Hirata, Daisuke Imafuku