Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8443876 | Top drive with inside blowout preventer | — | 2013-05-21 |
| 8443877 | Drilling rig with top drive and inside blowout preventer | — | 2013-05-21 |
| 8387720 | Drilling rig with a control system for rotationally rocking a drill string with a top drive | Stephen Lee Gerhauser, Jr. | 2013-03-05 |
| 8181721 | Torque track and slide assembly | — | 2012-05-22 |
| 8127836 | Top drive with an airlift thread compensator and a hollow cylinder rod providing minimum flexing of conduit | James R. Strickland, Alan Bing Joe Shem | 2012-03-06 |
| 7984757 | Drilling rig with a top drive with an air lift thread compensator and a hollow cylinder rod providing minimum flexing of conduit | James R. Strickland, Alan Bing Joe Shem | 2011-07-26 |
| 7921939 | Method for using a top drive with an air lift thread compensator and a hollow cylinder rod providing minimum flexing of conduit | James R. Strickland, Alan Bing Joe Shem | 2011-04-12 |
| 7788920 | Hydraulic pump with control system | — | 2010-09-07 |
| 6832658 | Top drive system | — | 2004-12-21 |
| 6659127 | Relief valve | — | 2003-12-09 |
| 4296842 | Pawl and ratchet mechanism | Herbert D. Horton | 1981-10-27 |
| 4254655 | Hydraulic fill valve | Herbert D. Horton | 1981-03-10 |
| 4246809 | Power tong apparatus for making and breaking connections between lengths of small diameter tubing | Herbert D. Horton | 1981-01-27 |