Patents by Inventor Kazumi Hata

Kazumi Hata 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).

  • Patent number: 5400266
    Abstract: A method for monitoring an error performance of each call in a digital exchange circuit has a plurality of subscriber terminals. The overall transmission system includes a plurality of circuits forming transit paths connecting the exchange circuit with each of the subscriber terminals. The method includes the steps of collecting and storing error check information of each transit path together with collected time of the information, and collecting and storing call information of each call. The call information includes call identification with terminal numbers of an originating subscriber terminal and a terminating terminal, transmission rate, start time and end time of a call, and the circuits through which the call is routed. A circuit accommodation database information is provided, which indicates which of the plurality of circuits form a path for each call.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: March 21, 1995
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Naoshi Sato, Kazumi Hata, Hideyo Murakami