Patents by Inventor Hirokazu Chikada

Hirokazu Chikada 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).

  • Automatic operation apparatus for ventilating fan
    Patent number: 5252030
    Abstract: A smoke sensor detects a smoke density in a room so as to automatically start the operation of a ventilating fan when the smoke density exceeds a predetermined value, but stops the operation of the ventilating fan when the smoke density becomes lower than the predetermined value. When the predetermined time elapses after the operation of the ventilating fan is automatically stopped, the operation of the ventilating fan is restarted to produce an air stream in the room to be ventilated in order to make the smoke density uniform in the room, thereby it is possible to enhance the degree of accuracy for detection by the smoke sensor so as to make the automatic operation of the ventilating fan appropriate.
    Type: Grant
    Filed: October 14, 1992
    Date of Patent: October 12, 1993
    Assignee: Matsushita Seiko Co., Ltd.
    Inventor: Hirokazu Chikada