Patents by Inventor Tomonori Matoba

Tomonori Matoba 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).

  • System for connecting ISDN tie line via ISDN office line
    Patent number: 5331629
    Abstract: An ISDN tie line connecting system connects an ISDN tie line between two private branch exchanges via an ISDN office line using an ISDN primary rate interface. The ISDN tie line connecting system includes a tie line interface, a provisional interface for connecting an office line interface, and an interface loop-back part which is coupled to each private branch exchange. The interface loop-back part carries out a conversion between the tie line interface and the provisional interface with respect to the ISDN primary rate interface.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: July 19, 1994
    Assignee: Fujitsu Limited
    Inventors: Tomio Tabata, Tomonori Matoba