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| Number | Title | Issue Date |
| 7367412 | Collapsible rock head A rock head for use with an auger borer to bore a passageway through a body of soil and rock and simultaneously laying a pipe in that bored passageway. The rock head has a base connectable to the leading end of the auger. A plurality of movable mounts are provided o... | 05/06/2008 |
| 7311153 | Flow-biased sequencing valve A technique that is usable with a well includes providing a sequencing valve to in a first state to communicate a first flow through a first port of the valve and in a second state close fluid communication through the first port. The technique includes communicatin... | 12/25/2007 |
| 7127955 | Torque limiting handle A torque limiting tool including an inner handle having a tool coupling portion, a biasing assembly aperture, and at least one radially oriented slot. At least one interface member is located in the radially oriented slot. The interface member includes an elongated ... | 10/31/2006 |
| 6550551 | Apparatus to actuate a downhole tool The invention provides an apparatus for actuating a downhole tool by utilizing a pressure differential created by fluid flowing through a conduit. The conduit is in communication with a pressure sensing line that is selectively exposable to areas of the c... | 04/22/2003 |
| 6364037 | Apparatus to actuate a downhole tool The invention provides an apparatus for actuating a downhole tool by utilizing a pressure differential created by fluid flowing through a conduit. The conduit is in communication with a pressure sensing line that is selectively exposable to areas of the c... | 04/02/2002 |
| 6357538 | 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... | 03/19/2002 |
| 6286614 | Motion compensator for drilling from a floater A motion compensator for drilling from a floater provides isolation of a cutting device in a well from motion of a tubular string thereabove. In a described embodiment, a motion compensator includes an anchoring device and an axial advancement device. The... | 09/11/2001 |
| 5086852 | Fluid flow control system for operating a down-hole tool A fluid flow control and mechanical actuation system for controlling fluid flow in and mechanically actuating a tool includes an upwardly biased and vertically movable actuating assembly for actuating a tool upon downward movement. Two passages extend thr... | 02/11/1992 |
| 4015433 | Method for settling anchoring device in the ground The present invention relates to an anchoring device which rigidly supports many kinds of standing objects in public works or in the construction industry and provides resistance to pulling loads exerted on the device, and also to a method for settling th... | 04/05/1977 |
