Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6619888 | Flange nut for mine roof bolt | Frank Calandra, Jr., John C. Stankus, Steve Oyler, John G. Oldsen | 2003-09-16 |
| 5851481 | Rebar with vanadium alloy | John C. Stankus, Frank Calandra, Jr., Ray W. Goetz | 1998-12-22 |