Patents by Inventor Chiou-Luh Uang

Chiou-Luh Uang 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: 4966208
    Abstract: A pencil sharpener comprises a housing defining a pencil passage, roller means for supporting and conveying a pencil back or forth along the pencil passage, abrasive means driven to rotate around the leading end of the pencil and self-rotate to produce a sharp point on the pencil and a control circuit for automatically performing pencil insertion, pointing treatment to pencil and pencil retraction of this invention.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: October 30, 1990
    Inventor: Chiou-Luh Uang