Patents by Inventor Yong Kyu Han

Yong Kyu Han 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).

  • Pencil sharpener
    Patent number: D540873
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: April 17, 2007
    Inventor: Yong Kyu Han
  • Pencil sharpener
    Patent number: D540874
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: April 17, 2007
    Inventor: Yong Kyu Han
  • Pencil sharpener
    Patent number: D541868
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: May 1, 2007
    Inventor: Yong Kyu Han