Patents Assigned to Addway Engineering Ltd.
  • Toothbrush
    Patent number: 6182321
    Abstract: A toothbrush has a handle provided with a rigid curve wire axle at one end. A hollow shank and toothbrush head rotatable and snugly fit to the axle. In the configuration shown bristles on the head are concave. The bristle formation can be made convex by rotating the shank on the axle by 180°.
    Type: Grant
    Filed: November 11, 1999
    Date of Patent: February 6, 2001
    Assignee: Addway Engineering Ltd.
    Inventor: Ka Shing Wu