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| Number | Title | Issue Date |
| 7644784 | Transport watercraft A transport floor connected to the transport watercraft. An elevated drilling floor integrally connected to the transport floor; supporting a derrick comprising at least two rails for supporting a traveling top drive supported by a crown block. The crown block is co... | 01/12/2010 |
| 7584810 | Top drive power swivel assembly A top drive power swivel assembly for well drilling rigs having a travelling frame for moving along a drilling tower. The travelling frame has at least two lower and two upper travelling frame extensions. A housing has at least two upper and two lower housing extens... | 09/08/2009 |
| 7559380 | Traveling swivel frame assembly with fixed brackets A top drive unit guiding system for aligning a power swivel and for dissipating torque created by the power swivel. The guiding system has a first guide frame and a second guide frame, where the first and second guide frames are located on opposite sides of the powe... | 07/14/2009 |
| 7537066 | Automatic driller An automatic driller for controlling a rotating primary mover. The automatic driller has a manual brake handle. The manual brake handle has a stroke. A first elastic means applies a first tension to the manual brake handle. A swivel bracket is connected to the first... | 05/26/2009 |
| 7197963 | Apparatus for clamping a drilling tubular against rotation An apparatus that can be used during drilling operations for the purposes of clamping and holding drilling tubulars is disclosed. The embodiments relate to machinery that clamp and hold drilling tubulars to allow assembly to a specified torque or disassembly of the ... | 04/03/2007 |
| 7178788 | Even reeving system for a top drive earth drilling machine An earth drilling machine includes a mast, a crown block assembly mounted on the mast top for providing a drilling line having front sheaves, a fast line sheave mounted to a crown block sheave for reeving the drilling line, a drawworks drum, and a traveling frame as... | 02/20/2007 |
