Patents by Inventor Doug Allard

Doug Allard 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).

  • Precast concrete drain inlet
    Patent number: 5360284
    Abstract: A drain inlet provides a hollow concrete shell and has a cylindrical bottom section and a square top section. A first opening in the bottom section includes a first lip formed on an interior wall thereof and recessed from the bottom opening. The first lip includes a first step and a second step. A gasket is adapted to fit within the bottom opening and abut the first step. The second step provides a stop for inserting the drain inlet over a riser. A second opening in the top section includes a second lip formed on an interior wall thereof and recessed from the top opening.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: November 1, 1994
    Inventor: Doug Allard