Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11583910 | Rotary stamper | Donald R. Hill | 2023-02-21 |
| 10137489 | Rotary stamper | Donald R. Hill | 2018-11-27 |
| 8783082 | Rotary stamper | Donald R. Hill | 2014-07-22 |
| 5690011 | Hydraulic double-cut tube cutoff | Donald R. Hill | 1997-11-25 |