Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5505562 | Mechanical truss wrench | John C. Stankus | 1996-04-09 |
| 5450663 | Method for fabricating a truss member for a mine roof support | Frank Calandra, Jr., Lajos Kovacs, John C. Stankus, Eugene H. Stewart | 1995-09-19 |
| 5302056 | Method and apparatus for supporting a mine roof | Frank Calandra, Jr., Lajos Kovacs, John C. Stankus, Eugene H. Stewart | 1994-04-12 |
| 5244314 | Expansion assembly | Frank Calandra, Jr., John C. Stankus | 1993-09-14 |
| 5082399 | Mine roof anchor having adjustable resin retaining washer and expansion shell assembly with friction reducing means | John C. Stankus, Eugene H. Stewart, Glen S. Grissinger | 1992-01-21 |
| 5076733 | Mine roof anchor assembly having an expansion shell assembly with a friction reducing means | — | 1991-12-31 |
| 5064312 | Delay stopper for a mine roof anchor and method of manufacture thereof | Frank Calandra, Jr. | 1991-11-12 |
| 4664561 | Combined resin-mechanical mine roof bolt anchor | — | 1987-05-12 |
| 4596496 | Mine roof supporting truss system | Gary D. Tyrell, Robert W. Hill | 1986-06-24 |