Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7748520 | Slip roller conveyor | David E. Helgerson | 2010-07-06 |
| 7503450 | Long roller slip conveyor | David E. Helgerson, Steven A. Jensen, Joshua D. Krause, Robert J. Robinson | 2009-03-17 |
| 7175018 | Conveyor assembly | David E. Helgerson, Steven A. Jensen, John Fresonke, Timothy J. Hall | 2007-02-13 |
| 6959804 | Conveyor assembly | David E. Helgerson, Steven A. Jensen, John Fresonke, Timothy J. Hall | 2005-11-01 |