Patents by Inventor David J. Rothermel

David J. Rothermel 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).

  • On-line pellet durability tester
    Patent number: 5285681
    Abstract: The durability of extruded, uncured animal feed pellets is measured by disintegrating the pellets in a test chamber by means of a rotating blade powered by an electric motor. During the test, the rotating blade is maintained at or near a constant rate of rotation and the time over which an increase of power is necessary to drive the blade at constant rotation is sensed to determine the durability of the pellets.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: February 15, 1994
    Assignee: Purina Mills, Inc.
    Inventors: Stephen F. Binder, Lawrence F. Reutzel, David J. Rothermel