Patents by Inventor John E. Duprey

John E. Duprey 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).

  • Five blade marine propeller
    Patent number: D319210
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: August 20, 1991
    Assignee: Brunswick Corporation
    Inventors: Roger E. Koepsel, John E. Duprey, Edward M. Thull