Patents by Inventor Yuuzi Yamasawa

Yuuzi Yamasawa 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).

  • Plant operating and monitoring apparatus
    Patent number: 5777896
    Abstract: In an apparatus for operating and monitoring a plant, a manipulating device provides the plant with manipulation signals for operating the plant. In response to information supplied from the plant and a manipulating signal of the manipulating device, a first display data producing device produces first display data needed for the operation of the plant changing every moment. On the basis of data supplied from the first display data producing device, a first display device displays information relating to the operation of the plant. In response to information supplied from the plant and a manipulating signal of the manipulating device, a second display data producing device produces data needed for monitoring the plant. On the basis of data supplied from the second display data producing device, a second display device displays information relating to the monitoring of the plant on a larger display screen than that of the first display device.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: July 7, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Setsuo Arita, Tetsuo Ito, Yukiharu Ohga, Fumio Murata, Yuichi Higashikawa, Hideyuki Sato, Mitsuru Kudo, Yuuzi Yamasawa
  • Plant operating and monitoring apparatus
    Patent number: 5748495
    Abstract: In an apparatus for operating and monitoring a plant, a manipulating device provides the plant with manipulation signals for operating the plant. In response to information supplied from the plant and a manipulating signal of the manipulating device, a first display data producing device produces first display data needed for the operation of the plant changing every moment. On the basis of data supplied from the first display data producing device, a first display device displays information relating to the operation of the plant. In response to information supplied from the plant and a manipulating signal of the manipulating device, a second display data producing device produces data needed for monitoring the plant. On the basis of data supplied from the second display data producing device, a second display device displays information relating to the monitoring of the plant on a larger display screen than that of the first display device.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: May 5, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Setsuo Arita, Tetsuo Ito, Yukiharu Ohga, Fumio Murata, Yuichi Higashikawa, Hideyuki Sato, Mitsuru Kudo, Yuuzi Yamasawa
  • Method and apparatus for selectively controlling an operation mode of a PWM inverter between an asychronous mode and a synchronous mode modulation
    Patent number: 4779183
    Abstract: A method and apparatus are disclosed for controlling a pulse width modulated (PWM) inverter controlled for ignition by a (PWM) pulse produced with a carrier wave and a modulation wave. The method comprises sampling an amplitude of the modulation wave at a cycle rate related to the frequency of the carrier wave. The modulation wave and the carrier wave are synchronized when the sample modulation wave amplitude has a peak value greater than an amplitude of the carrier wave. The modulation wave and the carrier wave are asynchronized when the sampled modulation wave has a peak value less than the amplitude of the carrier wave.
    Type: Grant
    Filed: July 22, 1987
    Date of Patent: October 18, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyoshi Mutoh, Akiteru Ueda, Hideyuki Shimonabe, Satoshi Ibori, Motonobu Hattori, Kenji Nandoh, Yuuzi Yamasawa