Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8251780 | Floor grinding machine and grinding head unit therefor | Derrick Lee Hamm, John E. Smith | 2012-08-28 |
| 8147297 | Surface grinding machine and grinding head therefor | Derrick Lee Hamm, John E. Smith | 2012-04-03 |