Patents by Inventor Li-Chuan Su

Li-Chuan Su 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).

  • Pay phone
    Patent number: 6031901
    Abstract: A pay phone includes a buffer block provided to buffer the falling of inserted coins, enabling inserted coins to be guided through a coin track and detected by sensor means, a motor controlled to turn a coin receiving control board through a set of gears, enabling inserted coins to be positively received by a coin receiving unit, and a link turned with a coin return unit to close the coin receiving unit when the handset is hung up.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: February 29, 2000
    Inventor: Li-Chuan Su
  • Pay phone
    Patent number: D410235
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: May 25, 1999
    Inventor: Li-Chuan Su