Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5054146 | Anchor bolt | David Wiesenfeld | 1991-10-08 |
| 4955219 | Rock bolt | David Wiesenfeld | 1990-09-11 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5054146 | Anchor bolt | David Wiesenfeld | 1991-10-08 |
| 4955219 | Rock bolt | David Wiesenfeld | 1990-09-11 |