Patents by Inventor Kyoichi Nakagawara

Kyoichi Nakagawara 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).

  • Electronic telephone exchange and method of connecting ports of the exchange
    Patent number: 4796294
    Abstract: In an electronic telephone exchange and a method of connecting ports of the exchange, highways connected to a time switch is divided into extension highways and office line highways and thus highways are connected to discrete terminals of a connector formed with extension interface circuits and office line interface circuits. Input and output terminals are provided at positions corresponding to the discrete terminals so as to connect the extension interface circuits and the office line interface circuits to corresponding highways through the input and output terminals thereby effecting exchange of communication signals through the highways.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: January 3, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kyoichi Nakagawara