TREA

Ka Shing Wu

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  • Kwun Tong, HK
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electric toothbrush
    • Patent number 6,453,498
    • Issue date Sep 24, 2002
    • Addway Engineering Limited
    • Ka Shing Wu
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Grant

    Toothbrush
    • Patent number 6,182,321
    • Issue date Feb 6, 2001
    • Addway Engineering Ltd.
    • Ka Shing Wu
    • A46 - BRUSHWARE
  • Information Patent Grant

    Toothbrush with water jet
    • Patent number 6,047,429
    • Issue date Apr 11, 2000
    • Addway Engineering Limited
    • Ka Shing Wu
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
  • Information Patent Grant

    Dental flosser
    • Patent number 5,931,170
    • Issue date Aug 3, 1999
    • Addway Engineering Limited
    • Ka Shing Wu
    • A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE