Patents by Inventor Douglas P. Allard

Douglas P. 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 drain inlet
    Patent number: D280126
    Type: Grant
    Filed: June 20, 1983
    Date of Patent: August 13, 1985
    Assignee: Central States Concrete Products, Inc.
    Inventors: William R. Provan, Douglas P. Allard