Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10443381 | Adjustable mine ventilation system and method | Courtland Joshua Helbig, Nathanael Rogers | 2019-10-15 |
| 9759065 | Mine ventilation system and method | Courtland Joshua Helbig, David William Lantz, III | 2017-09-12 |