Patents by Inventor Tomohiro Hotta

Tomohiro Hotta 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: 6826167
    Abstract: A communication relay system is connected to a line switched mobile communication system adapted to accommodate therein mobile terminals through radio channels and a packet switched mobile communication system adapted to accommodate therein the mobile terminals through radio channels. When a connection request has been made to a portable terminal, the communication relay system judges whether the portable terminal of interest is connected either to the line switched mobile communication system or to the packet switched mobile communication system.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: November 30, 2004
    Assignee: Hitachi, Ltd
    Inventors: Tatsuaki Osafune, Katsuyoshi Kitai, Tohru Hoshi, Tomohiro Hotta, Koji Hirayama
  • Publication number: 20020072367
    Abstract: A communication relay system is connected to a line switched mobile communication system adapted to accommodate therein mobile terminals through radio channels and a packet switched mobile communication system adapted to accommodate therein the mobile terminals through radio channels. When a connection request has been made to a portable terminal, the communication relay system judges whether the portable terminal of interest is connected either to the line switched mobile communication system or to the packet switched mobile communication system.
    Type: Application
    Filed: August 2, 2001
    Publication date: June 13, 2002
    Inventors: Tatsuaki Osafune, Katsuyoshi Kitai, Tohru Hoshi, Tomohiro Hotta, Koji Hirayama