Patents per Year
Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 12129735 | Tool for metal plugging or sealing of casing | David D. Hearn, Randall S. Shafer, Stewart M. Robertson, Dan Mueller | 2024-10-29 | $156,133,000 |
| 12010970 | Nano-thermite well plug | David D. Hearn, Randall S. Shafer | 2024-06-18 | $118,612,000 |
| 11480026 | Nano-thermite well plug | David D. Hearn, Randall S. Shafer | 2022-10-25 | $500,320,000 |
| 11441384 | Tool for metal plugging or sealing of casing | David D. Hearn, Randall S. Shafer, Stewart M. Robertson, Dan Mueller | 2022-09-13 | $243,170,000 |
| 10871050 | Nano-thermite well plug | David D. Hearn, Randall S. Shafer | 2020-12-22 | $269,665,000 |
| 10760374 | Tool for metal plugging or sealing of casing | David D. Hearn, Randall S. Shafer, Stewart M. Robertson, Dan Mueller | 2020-09-01 | $151,627,000 |