Patents by Inventor Koh-ichi Tatekura

Koh-ichi Tatekura 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).

  • Feed line connection circuit and optical transmission system
    Patent number: 6157098
    Abstract: A feed line connecting circuit for selectively connecting first, second and third feed line connecting terminals under a predetermined current feeding condition comprises a first current detector connected between one of the first and second feed line connecting terminals and a central node for detecting a current over a predetermined value; a first switch connected between the one of the first and second feed line connecting terminals and the central node for connecting said one of the first and second feed line connecting terminals to the central node under an unpowered condition; a selective switch controlled by the first current detector, the selective switch having first and second contacts and a common contact connected to the third feed line connecting terminal, the common contact being connected to the first selective contact when the first current detector does not detect a current over the predetermined value, and to the second selective contact when the first current detector detects a current over
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: December 5, 2000
    Assignees: KDD Corporation, KDD Submarine Cable Systems, Inc.
    Inventors: Junichi Kojima, Kenichi Asakawa, Koji Goto, Toshio Kawazawa, Koh-ichi Tatekura, Etsuo Nazuka