Patents by Inventor Guanghui Tong

Guanghui Tong 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 with a small limitation
    Publication number: 20080000094
    Abstract: A pencil sharpener with a small limitation having a blade module having at least one conical channel for receiving an end of a pencil that needs to be sharpened and a cutting blade fixed alongside the conical channel with a screw. A small limitation is formed on the blade module at a thinner end of each conical channel and alongside the cutting blade for stopping further insertion of the pencil along the conical channel when a lead of said pencil is sharpened to a predetermined length.
    Type: Application
    Filed: July 3, 2006
    Publication date: January 3, 2008
    Inventor: Guanghui Tong
  • Pencil sharpener
    Patent number: D705864
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: May 27, 2014
    Inventor: Guanghui Tong