Patents by Inventor Ryoko Shibuya

Ryoko Shibuya 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 switch matrix
    Patent number: 4846542
    Abstract: An optical switch matrix for selecting an optical propagation route between input ports and output ports by electric control. A first directional coupler is disposed on the input port side of a crosspoint of the matrix. A second directional coupler is disposed on the output port side of the crosspoint. A corner reflector is formed at a joint of the first and second directional coupler.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: July 11, 1989
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hideaki Okayama, Akio Matoba, Nobuo Kobayashi, Issei Asabayashi, Kiyoshi Nagai, Ryoko Shibuya