Patents by Inventor Erwin H. Wieland

Erwin H. Wieland 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).

  • Rotary tiller for maintaining cross country ski trails
    Patent number: 4559725
    Abstract: A rotary tiller for maintaining cross country ski trails has a rotary shaft with at least one array of radially extending first cutters flanked by laterally adjacent arrays of radially extending second cutters. The radial lengths of the first cutters are greater than the radial lengths of the second cutters. The first cutters are arranged to till a center ski track and the second cutters are arranged to till pole tracks on either side of the ski track, with the ski tracks having a tilled depth greater than that of the pole tracks.
    Type: Grant
    Filed: September 14, 1984
    Date of Patent: December 24, 1985
    Assignee: Karl Kassbohrer Fahrzeugwerke GmbH
    Inventors: Erwin H. Wieland, Walter Haug