Patents by Inventor Takuji Tujigawa

Takuji Tujigawa 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).

  • Internet telephone apparatus and internet telephone gateway system
    Patent number: 6704309
    Abstract: An Internet telephone apparatus which is capable of processing an Internet connection to an Internet telephone or to personal computer communications without requiring the installation of an additional public line, so that a cost for extension of a line and maintenance of the extended line can be eliminated. This Internet telephone apparatus has an incoming call determination unit for determining, based on information in a call setting message from a user, generated when a call is originated, whether the call is an incoming call directed to an access server for controlling communications such as personal computer communications or the like or an incoming call directed to an Internet telephone control unit for controlling the Internet telephone.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: March 9, 2004
    Assignee: Matsushita Electric Industrial, Co., Ltd.
    Inventors: Noriaki Nada, Takao Miyazaki, Kazuo Yahiro, Toshinori Yamagichi, Takuji Tujigawa, Yasuyuki Nishioka, Yuji Jodoi, Hidetoshi Hayashida, Daisuke Wada, Toru Imamura