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| Number | Title | Issue Date |
| 7100713 | Expandable apparatus for drift and reaming borehole An expandable reamer shoe is provided for use with expandable casing in a borehole. The reamer shoe has a number of reaming members in the form of blades which remain closed against the body of the shoe when inserted through casing, and can then be expanded to under... | 09/05/2006 |
| 6997271 | Drilling string torsional energy control assembly and method The present invention provides a torsional energy control assembly and method for eliminating slip-stick and/or drill bit oscillations comprising axial and/or rotational oscillations. In one preferred embodiment, the assembly permits slippage between an upper portio... | 02/14/2006 |
| 6594881 | Bit torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 07/22/2003 |
| 6182774 | Bit torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 02/06/2001 |
| 5947214 | BIT torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 09/07/1999 |
| 5595247 | Retrievable through tubing tool and method Retrievable window cutting apparatus and method include a whipstock assembly 160 and anchor assembly 10. Whipstock assembly 160 and anchor assembly 10 contract radially inwardly to pass through tubing string T and then expand radially outwardly to operate... | 01/21/1997 |
