Patents by Inventor Dal H. Cheong

Dal H. Cheong 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).

  • Device for detecting motor speed of automatic washing machine
    Patent number: 5576620
    Abstract: A device for detecting motor speed of an automatic washing machine suitable for controlling the motor speed in accordance with different kinds of laundry and for improving washing effect of the washing machine. The motor speed detecting device includes a motor speed detecting unit interposed between a support plate and a motor unit. The motor speed detecting unit is cased by a detecting unit casing and has a gear type detecting member mounted to the motor shaft, a rectangular base plate interiorly mounted to a side wall of the detecting unit casing, a magnet mounted to the base plate and generating a magnetic line of force and scanning the magnetic line of force on the detecting member, and a Hall effect linear sensor mounted to the magnet and sensing change of density of line of magnetic force.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: November 19, 1996
    Assignee: Goldstar Co., Ltd.
    Inventor: Dal H. Cheong