Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6226924 | Sealing rail car door | — | 2001-05-08 |
| 5318444 | Grain storage unloading system | Henry Derksen, Joseph Kuffner | 1994-06-07 |
| 5099984 | Telescopic auger | — | 1992-03-31 |
| 5099986 | Telescopic auger | — | 1992-03-31 |