Patents by Inventor Pen Han Chang

Pen 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).

  • Electric appliance/extension cord assembly with electromagnetic radiation-shielding function
    Patent number: 7186146
    Abstract: An electric appliance/extension cord assembly includes an electric appliance and an extension cord. The electric appliance includes a body having a plug with three prongs. The body further c includes a housing and a shielding conductive layer in the housing. The shielding conductive layer is electrically connected to a grounding prong of the plug of the electric appliance. The extension cord includes a casing and a plug. The casing includes a plurality of three-slot sockets. The plug of the extension cord is coupled with a two-slot socket. The plug of the electric appliance is coupled with one of the three-slot sockets of the extension cord. The extension cord further includes a detecting circuit for detecting a hot wire and a neutral wire of the two-slot socket.
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: March 6, 2007
    Inventors: Pen Yen Chang, Kuo Hung Liao, Pen Han Chang