Patents by Inventor Alan Delfs

Alan Delfs 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).

  • Dethatching apparatus with independently rotating sets of tines
    Patent number: 5408813
    Abstract: An improved ground-driven dethatching apparatus having at least two sets of independently rotating sets of dethatching tines. Each tine set is positioned along an independently rotating tine shaft which is rotated by a separate drive linkage and ground-engaging wheel. This arrangement ensures adequate torque to rotate the shafts and uniform dethatching when changing directions. The dethatcher automatically adjusts tine height, for example, in response to obstructions or variations in ground conditions.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: April 25, 1995
    Assignee: Haban Manufacturing Company
    Inventors: Joseph Haban, Donald R. Wittkowski, Alan Delfs