Patents by Inventor Junzo Hirano

Junzo Hirano 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).

  • Time division multiplex communication system
    Patent number: 4370744
    Abstract: A time division multiplex communication circuit is constituted by a set of loop shaped transmission line pairs which transmits time division multiplexed signals via a clockwise transmission line and a counterclockwise transmission line, a center office connected to starting and terminal ends of the transmission line pair, and a plurality of local offices located at intermediate points of the transmission line pair. The center office includes a device connected to the starting and terminal ends of the transmission line pair for transmitting and receiving signals therewith, and a processing means for assigning time slots of time division multiplexed channels of the transmission line pairs to signals to be sent to the transmission line pairs and for sending an interoffice signal regarding the assignment of the time slots to the local offices.
    Type: Grant
    Filed: February 28, 1980
    Date of Patent: January 25, 1983
    Assignee: Nippon Telegraph & Telephone Public Corp.
    Inventors: Junzo Hirano, Yukio Inoue