Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9926752 | Rod handling assembly | Paul Attiwell, David Christopher Williams | 2018-03-27 |
| 5311959 | Mine tool roof bit insert | — | 1994-05-17 |
| 4765686 | Rotatable cutting bit for a mining machine | — | 1988-08-23 |
| 4189013 | Roof drill bit | Mark S. Greenfield, Harry L. Seibert | 1980-02-19 |