Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6651599 | Free-piston engines | — | 2003-11-25 | |
| 6170848 | System and related method for steering an articulated train | — | 2001-01-09 | |
| 5072826 | Chain conveyor for miner | — | 1991-12-17 | $5,473,000 |
| 4932481 | Roof bolt drill support | — | 1990-06-12 | |
| 4919252 | Chain conveyor for miner | — | 1990-04-24 | |
| 4865184 | Chain conveyor drive | — | 1989-09-12 | |
| 4856384 | Roof bolt drill pot drive | — | 1989-08-15 | |
| 4828327 | Bit holder for miner | — | 1989-05-09 | |
| 4813530 | Conveyor drive for miner | — | 1989-03-21 | |
| 4655507 | Continuous miner | — | 1987-04-07 | $4,688,000 |
| 4650254 | Bit holder | — | 1987-03-17 | $1,470,000 |