Patents by Inventor Yong-Han Chang

Yong-Han Chang 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).

  • Remote control sweeper
    Publication number: 20070006404
    Abstract: A remote control sweeper includes a wireless remote control receiver installed at the sweeper; a remote control for transmitting a direction control signal to the remote control receiver via a wireless transmission to control the moving direction of the sweeper, such that the sweeper can be moved to automatically clean up the dirt and collect the dust on a floor.
    Type: Application
    Filed: July 8, 2005
    Publication date: January 11, 2007
    Inventors: Tzo Cheng, Yong-Han Chang