Patents by Inventor Kwok-Nam Shek

Kwok-Nam Shek 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).

  • Electric toothbrushes
    Patent number: 5784743
    Abstract: An electric toothbrush has a drive shaft with an off-set finger. A pivotably supported wobble plate has a fork at one end and an arcuate drive gear at another end. The drive gear meshes with a gear rotatably fixed to a brush holder so that in use the brush holder is caused to oscillate. The arrangement provides more flexibility in design and in particular enables the maximum arc of oscillation to be significantly increased over similar prior art toothbrushes.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: July 28, 1998
    Assignee: Addway Engineering Limited
    Inventor: Kwok Nam Shek
  • Mechanically driven toothbrush
    Patent number: 5778474
    Abstract: A toothbrush has a thin, metal cam shaft rotatably driven about a central longitudinal axis. Tuft blocks are mounted in a head member and constrained to pivot about an axis of a support shaft. Upper sides of the tuft blocks each have a slot which fits somewhat loosely over the cam shaft. During use, the cam shaft causes upstanding ends of bristles to move from side to side.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: July 14, 1998
    Assignee: Addway Engineering Limited
    Inventor: Kwok-Nam Shek