Patents by Inventor Fredrick Silbernagel

Fredrick Silbernagel 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).

  • Front discharge transit mixer
    Patent number: D423409
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: April 25, 2000
    Assignee: Maxim Trucks
    Inventor: Fredrick Silbernagel