Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4662795 | Method of supporting a mine roof using nut element with breakable portion | Carl A. Clark | 1987-05-05 |
| RE31776 | Resin reinforced expansion anchor and method of installation | Carl A. Clark | 1984-12-25 |