Patents by Inventor Yoji Tsuboi

Yoji Tsuboi 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).

  • ATM switching unit
    Patent number: 5255266
    Abstract: A transmission line control processor performs various processes in response to requests of a call processor for capture, allotment, and release of a subscriber line or an inter-station line. Additionally, in response to requests of the call processor for a reservation, connection, and disconnection of a path, the transmission line control processor instructs an ATM switch to connect or disconnect the path. These processes can be performed using with the existing functions of ordinary call processors, and such complicated processes as the management of bands at ATM switches are executed exclusively by a transmission line control processor.
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: October 19, 1993
    Assignee: Fujitsu Limited
    Inventors: Yoshihiro Watanabe, Junichi Yamazaki, Kazuo Hajikano, Toshio Shimoe, Yoji Tsuboi, Norihito Nishimoto, Yoshiharu Sato