Patents by Inventor Seiichiro Sakai

Seiichiro Sakai 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).

  • Communication system using a bidirectional tree structure network
    Patent number: 5559803
    Abstract: A communication system includes a bidirectional tree network having a base end and a plurality of terminating ends, a central apparatus connected to the base end, a plurality of terminating equipment connected respectively to the terminating ends, and a plurality of subscriber terminals accommodated respectively in the terminating equipment. Each of the terminating equipment has a multiplexer for multiplexing information transmitted from the subscriber terminal accommodated therein to the central equipment, and a signal selection device for discriminating and selectively receiving only information which is destined for the subscriber terminal accommodated in this terminating equipment from information transmitted from the central apparatus to all the subscriber terminals via the tree network.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: September 24, 1996
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Seiichiro Sakai, Yoshio Takeuchi, Masayoshi Ohashi, Toshio Mizuno