Patents by Inventor I-Lung Tsai

I-Lung Tsai 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 with adjustable double brush heads
    Patent number: 5791007
    Abstract: A pair of brush heads of a toothbrush may be positioned adjacent each other to define a single brush surface or facing each other to define a pair of opposed brush surfaces by slidable engagement between a V-shaped groove of a movable push block and a pair of oppositely directed spiral ribs on a pair of rolling rods supporting the brush heads, so that the single brush surface may be used to clean the front teeth and the opposed brush surfaces may be used to clean the back teeth.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: August 11, 1998
    Inventor: I-Lung Tsai