Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6131061 | Apparatus and method for preventing underdigging of a work machine | Lee R. Denbraber, John D. Duffy, Mark Hawkins | 2000-10-10 |
| 5823295 | Lubrication control system for a work machine | Bobby D. Griffith, Mark Hawkins, Dean J. Schlickbernd | 1998-10-20 |
| 5564274 | Cold oil protection circuit for a hydraulic system | Lee R. Denbraber, Mark Hawkins, David R. Meinhold | 1996-10-15 |