Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6454542 | Hydraulic cylinder powered double acting duplex piston pump | — | 2002-09-24 |
| 6298927 | Pipe storage and handling system for a drilling rig | — | 2001-10-09 |
| 5697457 | No load derrick for drilling rig | — | 1997-12-16 |
| 5306124 | Slurry pump and seal system | — | 1994-04-26 |
| 5094302 | Drilling rig | — | 1992-03-10 |
| 4971162 | Continuous drill feed apparatus | — | 1990-11-20 |
| 4671365 | Drill feeding and hoisting system for an earthdrill | — | 1987-06-09 |