Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4649729 | Method for manufacturing steel bar with intermittent smooth surface and patterned relief segments, and mine roof bolt product | A. Dale McDowell | 1987-03-17 |
| 4193715 | Mine roof support method and apparatus | — | 1980-03-18 |
| 4192631 | Mine roof support method and apparatus | — | 1980-03-11 |