Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9835186 | Hydraulic flushing system and method | Bradley C. Dauderman, Donald O. Johannsen, John R. Mahrenholz, Chris J. Schaub, Kyle S. Droessler +2 more | 2017-12-05 |
| 8499659 | Gearbox with multi-function quill | Ryan Benson, Donald O. Johannsen | 2013-08-06 |