Patents by Inventor Ching Cheng Chen

Ching Cheng Chen 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 doorbell chime extender
    Patent number: 7023327
    Abstract: A remote chime unit and signal extender assembly are connectable to the circuitry of a primary doorbell system allowing the remote chime to be activated simultaneously with the primary doorbell chime from a stored voltage source.
    Type: Grant
    Filed: July 21, 2003
    Date of Patent: April 4, 2006
    Inventor: Ching Cheng Chen