Patents by Inventor Shim Sumida

Shim Sumida 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).

  • Multi core optical fiber
    Patent number: 4653852
    Abstract: A multi core optical fiber made of quartz glass comprising at least two cores the centers of which are arranged substantially on one line. The distances between the centers of the adjacent cores are substantially the same in the longitudinal direction. A first cladding covers the cores and the second cladding covers the first cladding and has a larger refractive index than the first one. The fiber has improved mechanical strength and low cross-talk even if the distance between the adjacent cores is short.
    Type: Grant
    Filed: January 3, 1985
    Date of Patent: March 31, 1987
    Assignees: Sumitomo Electric Industries, Ltd, Nippon Telegraph and Telephone Public Corporation
    Inventors: Shuzo Suzuki, Ichiro Ogasawara, Hiroshi Yokota, Shim Sumida