Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7284933 | Square embossed roof and rib plate | Frank Calandra, Jr., John C. Stankus, Eugene H. Stewart, Demrey G. Brandon | 2007-10-23 |
| 6599059 | Three-prong shell | Frank Calandra, Jr., John C. Stankus, Brandon Demrey, Larry Boozer | 2003-07-29 |
| 5954455 | Combination bolt system | Frank Calandra, Jr., John G. Oldsen, John C. Stankus | 1999-09-21 |
| 5785463 | Combination cable bolt system | Frank Calandra, Jr., John G. Oldsen | 1998-07-28 |