Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9903089 | Tubular insert for excavated hole with safety cover | Dan Bartels | 2018-02-27 |
| 9650803 | Tubular insert for excavated hole with safety cover | Dan Bartels | 2017-05-16 |
| 7966772 | Tubular insert for excavated hole with safety cover | Bernard George Bartels, Marc Jean-Luc Beaudry, Darren Van Buuren | 2011-06-28 |