Patents by Inventor Hitoshi Yasufuku

Hitoshi Yasufuku 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).

  • Ventilator drive system
    Patent number: 4953784
    Abstract: A ventilator drive system includes a fan for exhausting an indoor air to the outdoors and introducing an outdoor air to an indoor side, an electric motor for driving the fan, a humidity sensor having a humidity sensing element which abuts against an indoor side surface of a room wall as close as possible or which is located so that heat is transferred from the room wall, and a control circuit for comparing a signal from the humidity sensor with a reference signal. The motor is energized when the relative humidity is increased to a reference level or above.
    Type: Grant
    Filed: April 10, 1989
    Date of Patent: September 4, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Yasufuku, Toshikazu Ogata