Patents by Inventor Ryouzi Sekiguchi

Ryouzi Sekiguchi 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).

  • Prism and real image type view finder
    Patent number: 5838504
    Abstract: A prism is provided having a surface on which light is made incident, surfaces at which light is reflected and a surface from which light is emitted. The prism includes an uneven surface portion provided on at least one of the incident, reflecting or emitting surfaces and located outside a light transmission area through which effective light of an associated optical system, in which the prism is to be incorporated, can be transmitted. The disclosure is also directed to a real image type view finder having such a prism.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: November 17, 1998
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Yuichi Ichikawa, Sachio Hasushita, Ryouzi Sekiguchi