Patents by Inventor Ikuo Betsui

Ikuo Betsui 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).

  • Optical attenuator
    Patent number: 4893889
    Abstract: An optical attenuator for attenuating optical power by providing an air gap between coupled fiber ends. Both the end faces are allowed to have an inclination, thereby providing an optical attenuator with less reflected light and multiple reflection between coupled fibers.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: January 16, 1990
    Assignee: Seiko Instruments Inc.
    Inventors: Toyokazu Iwakiri, Akira Sugiyama, Yoshio Kashima, Ikuo Betsui, Nobuo Suzuki