Patents by Inventor Kwok Wai Leung

Kwok Wai Leung 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).

  • Toothbrush
    Patent number: 6397424
    Abstract: A toothbrush incorporates a directional inertia switching arrangement in its handle and has an electrical pressure switch that responds to bending of the brush. When the brush is used correctly to brush teeth up and down and sufficient pressure is simultaneously applied to operate the switch, LED's are caused to be switched ON and OFF. This switching ON and OFF serves to visually indicate and especially to train a young person to brush his teeth correctly.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: June 4, 2002
    Inventor: Kwok Wai Leung
  • Portable jump starter with blinkers
    Patent number: D519448
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: April 25, 2006
    Assignee: Fee Tat Holdings (H.K.) Limited
    Inventor: Kwok Wai Leung