Issued Patents All Time
Showing 26–50 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7390147 | Yieldable prop having a yield section | John G. Oldsen | 2008-06-24 |
| 7360971 | Yieldable prop | John G. Oldsen, Demrey G. Brandon | 2008-04-22 |
| 7334968 | Yieldable prop | John G. Oldsen, Demrey G. Brandon | 2008-02-26 |
| 7296950 | Point anchor coated mine roof bolt | John G. Oldsen | 2007-11-20 |
| 7284933 | Square embossed roof and rib plate | Frank Calandra, Jr., Jack R. Eaton, Eugene H. Stewart, Demrey G. Brandon | 2007-10-23 |
| 7261494 | Truss shoe | John G. Oldsen, Demrey G. Brandon, Arthur J. Craven, Jeffrey J. Stankus | 2007-08-28 |
| 7134810 | Yieldable prop having a yield section | John G. Oldsen | 2006-11-14 |
| 7114888 | Yieldable prop | John G. Oldsen | 2006-10-03 |
| 7073982 | Point anchor coated mine roof bolt | John G. Oldsen | 2006-07-11 |
| 6832165 | Method of roof instability rating | Yajie Wang | 2004-12-14 |
| 6619888 | Flange nut for mine roof bolt | Frank Calandra, Jr., Michael Cokus, Steve Oyler, John G. Oldsen | 2003-09-16 |
| 6612783 | Cable bolt with mixing delay device | John G. Oldsen | 2003-09-02 |
| 6599059 | Three-prong shell | Frank Calandra, Jr., Brandon Demrey, Jack R. Eaton, Larry Boozer | 2003-07-29 |
| 6527482 | Grit surface cable products | — | 2003-03-04 |
| 6322290 | Cable bolt head | Frank Calandra, Jr., Eugene H. Stewart, Stanley Ponce, John G. Oldsen, Brian R. Castle | 2001-11-27 |
| 6283451 | Hydraulic tensioner for mine roof support cables | Kendal L. Taylor | 2001-09-04 |
| 6270290 | Tensionable cable bolt | Kendal L. Taylor | 2001-08-07 |
| 6074134 | Tensionable cable bolt | Kendal L. Taylor | 2000-06-13 |
| 6056482 | Cable bolt head | Frank Calandra, Jr., Eugene H. Stewart, Stanley Ponce, John G. Oldsen, Brian R. Castle | 2000-05-02 |
| 5967703 | Mine roof support system | John G. Oldsen, Brian R. Castle | 1999-10-19 |
| 5957627 | Pillar cable truss system | John G. Oldsen, Brian R. Castle | 1999-09-28 |
| 5954455 | Combination bolt system | Jack R. Eaton, Frank Calandra, Jr., John G. Oldsen | 1999-09-21 |
| 5919006 | Tensionable cable bolt with mixing assembly | Frank Calandra, Jr., James J. Scott, Brian R. Castle, John G. Oldsen, Kendal L. Taylor +1 more | 1999-07-06 |
| RE36019 | Roof control system | — | 1998-12-29 |
| 5851481 | Rebar with vanadium alloy | Frank Calandra, Jr., Michael Cokus, Ray W. Goetz | 1998-12-22 |