Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8821075 | Yieldable support prop and method | Thomas O'Donnell | 2014-09-02 |
| 6612803 | Positioning cradle for mine roof supports | William A. Anderson | 2003-09-02 |
| 6352392 | Mine roof support crib having only two or three planes, and method | — | 2002-03-05 |
| 5746547 | Mine support cribs | John J. Reinmann, Jr. | 1998-05-05 |
| 5137395 | Dynamic earth anchor, and a sleeve therefor | — | 1992-08-11 |
| 5051038 | Barrier plug for dynamic rock stabilizing fixture | Clyde R. Smith | 1991-09-24 |
| 5033909 | Coupling for anchor rod and sleeve | — | 1991-07-23 |
| 5033911 | Barrier plug for a bore | Roger Grbavac | 1991-07-23 |
| 4952096 | Dynamic earth anchor, and a sleeve therefor | — | 1990-08-28 |
| 4313695 | Earth structure stabilizing method, and a friction rock stabilizer and an axial extension therefor | — | 1982-02-02 |