Patents by Inventor Dennis J. Zumbahlen

Dennis J. Zumbahlen 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).

  • Livestock self-feeder
    Patent number: 4582023
    Abstract: A livestock self-feeder includes a main feed storage hopper supplying feed to a retaining area in which the height of feed is constant and independent of the amount of feed in the main hopper. The feed is then dispensed from the retaining hopper through an adjustable feed gate.
    Type: Grant
    Filed: November 14, 1984
    Date of Patent: April 15, 1986
    Assignee: Zumbahlen Equipment Company
    Inventors: Dennis J. Zumbahlen, Vincent J. Zumbahlen, Cary L. Sizelove, Sr., William J. Dietrich, Sr.