Patents by Inventor Wing Leung Au

Wing Leung Au 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).

  • Surround system pest control
    Patent number: 6349888
    Abstract: An insecticide dispensing apparatus for delivering insecticide from an outside source to a building having a foundation and a roof space thereunder. The apparatus includes an access unit having an inlet port external to the building, an upper pipeline arrangement having at least one outlet is located in the roof space and extends to the access unit. A lower pipeline arrangement including at least one outlet is located under the foundation. This lower pipeline arrangement also extends to the access unit whereby insecticide is effectively distributed with respect to the building.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: February 26, 2002
    Inventors: Wing Leung Au, Bruce Harold Taylor