Patents by Inventor Charles Ka-Chow Ip

Charles Ka-Chow Ip 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).

  • Retractable key chain
    Patent number: 7574881
    Abstract: A lanyard or key chain having a non-coiled body with two connecting ends. The body is made of a resiliently deformable material and is stretchable between extended and retraced states.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: August 18, 2009
    Inventors: Tak Ko Wong, Charles Ka-Chow Ip