Patents by Inventor Li-Chu Chien

Li-Chu Chien 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).

  • Slip proof sleeve for a door knob
    Publication number: 20040055116
    Abstract: A slip proof sleeve includes a first edge with an undulated pattern, and at least an annular groove defined in an inner face of the slip proof sleeve. With the at least one annular groove, the slip proof sleeve is able to fit to and completely engage with an outer contour of a door knob.
    Type: Application
    Filed: September 23, 2002
    Publication date: March 25, 2004
    Inventor: Li-Chu Chien
  • Peephole viewer
    Patent number: D670321
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: November 6, 2012
    Inventor: Li-Chu Chien