Issued Patents 2020
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10871050 | Nano-thermite well plug | David D. Hearn, Randall S. Shafer | 2020-12-22 |
| 10760374 | Tool for metal plugging or sealing of casing | David D. Hearn, Randall S. Shafer, Stewart M. Robertson, Dan Mueller | 2020-09-01 |