Issued Patents 2017
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9724548 | Terminating expansion of underground coal fires and protecting the environment | David A. Johnson | 2017-08-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9724548 | Terminating expansion of underground coal fires and protecting the environment | David A. Johnson | 2017-08-08 |