Patents by Inventor Syuichirou Inagaki

Syuichirou Inagaki 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).

  • Automated optical main distributing frame system
    Patent number: 5204921
    Abstract: In an optical MDF (main distributing frame) for interconnecting external subscriber optical lines (122) with office optical lines (131) through jumpering operation, a matrix waveguide (128, 129, 130) having a plurality of crosspoints coupled with external lines and office lines is used. The matrix waveguide has a groove (235 in FIG. 4A) at each crosspoint so that said crosspoint is switched ON or OFF depending upon whether said groove is filled with matching oil or not, so that one of the external lines is connected to the selected office line. Said matching oil has the same refractive index as that of waveguides. Each crosspoint groove is coupled with a respective oil pool (236), which supplies matching oil which has essentially the same refractive index as that of a waveguide to said groove.
    Type: Grant
    Filed: January 7, 1992
    Date of Patent: April 20, 1993
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Tsuneo Kanai, Shigefumi Hosokawa, Kunihiko Sasakura, Syuichirou Inagaki, Shigeru Umemura, Hirobumi Kimura, Akira Nagayama, Mitsuhiro Makihara, Masao Kawachi