Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8596923 | System and method for mine roof counter bore and cable bolt head securement therein | John G. Oldsen, John C. Stankus, Demrey G. Brandon | 2013-12-03 |
| 8052353 | System and method for mine roof counter bore and cable bolt head securement therein | John G. Oldsen, John C. Stankus, Demrey G. Brandon | 2011-11-08 |