Patents by Inventor Hisao Koda

Hisao Koda 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).

  • Data transmission system, data transmission communication station, and data transmission method
    Patent number: 6813326
    Abstract: A data transmission system for transmitting data from a transmitter to a receiver located away therefrom. The transmitter includes circuitry for transmitting together a main signal having a carrier modulated with main data to be transmitted and as well as a sub-signal to be used in frequency conversion and generated by modulating a carrier of a predetermined frequency out of a frequency band of the main signal. The receiver includes circuitry for receiving a receive signal from the transmitter and extracting the sub-signal therefrom and also includes circuitry for generating a signal to be used as a reference at the time of converting the receive signal to a signal having a predetermined frequency on the basis of the extracted sub-signal.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: November 2, 2004
    Assignee: Hitachi Denshi Kabushiki Kaisha
    Inventors: Atsushi Miyashita, Toshiyuki Akiyama, Seiichi Sano, Hisao Koda, Itsuo Ishida, Hiroyuki Takesue, Tatsuhiro Nakada, Nobuo Tsukamoto