| 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 |