Patents by Inventor Toshikatsu Nakajima

Toshikatsu Nakajima 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).

  • Telephone communication method capable of relating a telephone terminal and a speech channel IP address at the time of call connection
    Patent number: 6400719
    Abstract: A telephone communication method capable of promoting the efficient use of the limited number of IP (Internet Protocol) addresses is disclosed. When a call is originated on a first telephone terminal, a first gateway accommodating the terminal accesses a DNS (Domain Name System) server via a UDP (User Datagram Protocol) channel of Internet or Intranet. The first gateway inquires the DNS server of the IP address of a second gateway accommodating a telephone terminal to be called, using an office number assigned to the second telephone terminal as a host name. The DNS server returns the IP address of the second gateway to the first gateway via the UDP channel. In response, the first gateway selects its own IP address for speech transfer and sends a call connection request to the second gateway on a TCP (Transmission Control Protocol) channel of Internet.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: June 4, 2002
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yasubumi Chimura, Masanori Goto, Mitsuo Endou, Toshikatsu Nakajima