Issued Patents All Time
Showing 51–75 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5836720 | Mine roof support system | John G. Oldsen, Brian R. Castle | 1998-11-17 |
| 5829922 | Cable bolt head | Frank Calandra, Jr., Eugene H. Stewart, Stanley Ponce, John G. Oldsen, Brian R. Castle +1 more | 1998-11-03 |
| 5824912 | Method of roof control in an underground mine | Song Guo | 1998-10-20 |
| RE35902 | Bearing plate | Frank Calandra, Jr., Eugene H. Stewart | 1998-09-22 |
| 5769570 | Cable tensioning dome plate | Eugene H. Stewart, Kendal L. Taylor | 1998-06-23 |
| 5762451 | Multi-piece, split bail expansion anchor | Song Guo, Frank Calandra, Jr. | 1998-06-09 |
| 5741092 | Cable bolt driver | Brian R. Castle, John G. Oldsen | 1998-04-21 |
| 5556234 | Mine roof bolt assembly | John G. Oldsen | 1996-09-17 |
| 5542788 | Method and apparatus for monitoring mine roof support systems | Song Guo | 1996-08-06 |
| 5511909 | Cable bolt and method of use in supporting a rock formation | Frank Calandra, Jr., John G. Oldsen | 1996-04-30 |
| 5505562 | Mechanical truss wrench | Jerry E. Frease | 1996-04-09 |
| 5450663 | Method for fabricating a truss member for a mine roof support | Frank Calandra, Jr., Jerry E. Frease, Lajos Kovacs, Eugene H. Stewart | 1995-09-19 |
| 5437830 | Process of making a rod for use in reinforcing an underground rock formation | Frank Calandra, Jr., John G. Oldsen | 1995-08-01 |
| 5425601 | Longwall mining roof control system | Frank Calandra, Jr. | 1995-06-20 |
| 5385433 | Bearing plate | Frank Calandra, Jr., Eugene H. Stewart, Dominic Cricelli | 1995-01-31 |
| 5314268 | Non-metallic reinforcing rod and method of use in supporting a rock formation | Frank Calandra, Jr., John G. Oldsen | 1994-05-24 |
| 5302056 | Method and apparatus for supporting a mine roof | Frank Calandra, Jr., Jerry E. Frease, Lajos Kovacs, Eugene H. Stewart | 1994-04-12 |
| 5292209 | Bearing plate | Frank Calandra, Jr., Eugene H. Stewart | 1994-03-08 |
| 5244314 | Expansion assembly | Frank Calandra, Jr., Jerry E. Frease | 1993-09-14 |
| 5232311 | Roof control system | — | 1993-08-03 |
| 5184923 | Expansion shell assembly | Frank Calandra, Jr., Paul Yacisin | 1993-02-09 |
| 5181800 | Mine roof anchor having adjustable resin retaining washer | Eugene H. Stewart, Glen S. Grissinger | 1993-01-26 |
| 5082399 | Mine roof anchor having adjustable resin retaining washer and expansion shell assembly with friction reducing means | Jerry E. Frease, Eugene H. Stewart, Glen S. Grissinger | 1992-01-21 |
| 5078547 | Expansion assembly for mine roof bolts | Frank Calandra, Jr. | 1992-01-07 |
| 5009549 | Expansion assembly for mine roof bolts | — | 1991-04-23 |