Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4655643 | Rockbolt and installer wand | Donald L. Lewis | 1987-04-07 |
| 4655644 | Binder-injecting rockbolt | Donald L. Lewis | 1987-04-07 |
| 4601614 | Rockbolt | Donald L. Lewis | 1986-07-22 |
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4655643 | Rockbolt and installer wand | Donald L. Lewis | 1987-04-07 |
| 4655644 | Binder-injecting rockbolt | Donald L. Lewis | 1987-04-07 |
| 4601614 | Rockbolt | Donald L. Lewis | 1986-07-22 |