Patents by Inventor Yi-Huang Chang

Yi-Huang 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).

  • Plug
    Patent number: D398581
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: September 22, 1998
    Inventor: Yi-Huang Chang
  • Battery recharger
    Patent number: D413097
    Type: Grant
    Filed: January 16, 1998
    Date of Patent: August 24, 1999
    Inventor: Yi-Huang Chang
  • Battery recharger
    Patent number: D414742
    Type: Grant
    Filed: September 9, 1997
    Date of Patent: October 5, 1999
    Inventor: Yi-Huang Chang