Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9975186 | Ejector drill system | David A. Lutz, James R. Porter | 2018-05-22 |
| 9561550 | Ejector drill system | David A. Lutz, James R. Porter | 2017-02-07 |
| 8556550 | Ejector drill system | David A. Lutz, James R. Porter | 2013-10-15 |