Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10816431 | Leak detection system for underground access chambers using conductivity | Charles A. Hansen, Mark Grabowski, Sean Blottie, Sonja Hansen, Bianca Hansen +1 more | 2020-10-27 |
| 10451515 | Electric field expansion system for low voltage conductivity inspection | Charles A. Hansen, Mark Grabowski | 2019-10-22 |