Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6322290 | Cable bolt head | Frank Calandra, Jr., Eugene H. Stewart, John G. Oldsen, John C. Stankus, Brian R. Castle | 2001-11-27 |
| 6056482 | Cable bolt head | Frank Calandra, Jr., Eugene H. Stewart, John G. Oldsen, John C. Stankus, Brian R. Castle | 2000-05-02 |
| 5829922 | Cable bolt head | Frank Calandra, Jr., Eugene H. Stewart, John G. Oldsen, John C. Stankus, Brian R. Castle +1 more | 1998-11-03 |