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| Number | Title | Issue Date |
| 7730974 | Self actuating underreamer An underreamer for well drilling comprises pivotally extendible roller cutters that extend slightly beyond the diameter of the pilot drill bit but are retained in their retracted position by the casing. Upon encountering an obstruction, the underreamer is pushed out... | 06/08/2010 |
| 7686103 | Drill bit with radially expandable cutter, and method of using same A drill bit having a body with a stationary cutter and a rotatable cutter such that in a first position the rotatable cutter does not radially extend beyond a periphery of the stationary cutter and in a second position the rotatable cutter radially extends beyond th... | 03/30/2010 |
| 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 |
| 7139219 | Hydraulic impulse generator and frequency sweep mechanism for borehole applications This invention discloses a valve that generates a hydraulic negative pressure pulse and a frequency modulator for the creation of a powerful, broadband swept impulse seismic signal at the drill bit during drilling operations. The signal can be received at monitoring... | 11/21/2006 |
| 7104344 | Percussion drilling head Device and method for drilling into geological formations. The device comprises: a rotatable body; drilling cutters arranged on an axial end surface of the rotatable body; a percussion part, which ... | 09/12/2006 |
| 6976547 | Actuator underreamer An underreamer for forming a cavity from within a well bore includes a housing adapted to be disposed within the well bore. The underreamer includes an actuator partially slidably positioned in the housing. The actuator comprises a first portion and a second portion... | 12/20/2005 |
| 6973978 | Drilling tool having an expandable bladder and method for using same A drilling tool having an expandable bladder and a method for using the same are provided. The drilling tool includes a tool body having an interior cavity, a plurality of extendable arms coupled with the tool body, and an expandable bladder at least partially dispo... | 12/13/2005 |
| 6951770 | Method of manufacturing a photovoltaic foil The invention pertains to a method of manufacturing a photovoltaic foil comprising a TCO layer, a photovoltaic layer, and a back electrode, which method comprises the following steps: providing a conductive temporary substrate; applying a TCO layer on the temporary ... | 10/04/2005 |
| 6926099 | Drill out bi-center bit and method for using same A drill out bi-center bit and a method for using the same are provided that offer the ability to drill out cement and casing shoes, and increased stability. The bi-center bit includes a bit body having a first end operable to be coupled with a drill string, a second... | 08/09/2005 |
| 6920944 | Apparatus and method for drilling and reaming a borehole A drilling assembly and an eccentric, adjustable diameter reamer are disclosed. The reamer includes cutter elements mounted on at least a first fixed blade for reaming a previously-formed borehole or for forming a borehole of increased diameter beneath an existing c... | 07/26/2005 |
| 6695074 | Method and apparatus for enlarging well bores A reaming tool for enlarging an earth bore in a subsurface formation in which a sub is connected to a lower end of a drill string and elongated cutter blades are pivotally secured to a lower end of the body which have cutter elements preferably in the for... | 02/24/2004 |
| 6691803 | Drill bit assembly having pivotal cutter blades A drill bit assembly for earth boring operations in which a sub is connected to a lower end of a drill string and elongated cutter blades are pivotally secured to a lower end of the body which have cutter elements preferably in the form of rotatable cutte... | 02/17/2004 |
| 6668949 | Underreamer and method of use An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resi... | 12/30/2003 |
| 6595301 | Single-blade underreamer A single-blade underreamer for forming a cavity within a well bore includes a housing rotatably disposed within the well bore, and a stabilizer coupled to the housing. The stabilizer is operable to stabilize the housing within the well bore during formati... | 07/22/2003 |
| 6591922 | Pantograph underreamer and method for forming a well bore cavity An underreamer for forming a cavity within a well bore may include a housing rotatably disposed within the well bore. The underreamer may also include an actuation rod slidably positioned in the housing. The underreamer may further include a plurality of ... | 07/15/2003 |
| 6588517 | Boring apparatus Apparatus for boring a hole from an inside of a casing outwardly at an angle relative to a longitudinal axis of the casing comprises a drill shoe having a longitudinal axis and being positionable in the casing, the shoe having first and second passageways... | 07/08/2003 |
| 6550553 | Boring apparatus Apparatus for boring a hole from an inside of a tube outwardly perpendicular to a longitudinal axis of the tube comprises a drill shoe having a longitudinal axis and being positionable in the tube, the shoe having an inlet, an outlet perpendicular to the ... | 04/22/2003 |
| 6454024 | Replaceable drill bit assembly In a retrievable drill bit assembly, a standard drill pipe or casing pipe has a sub threaded into its lower end which forms a seat coupling for upper rounded pivotal ends of a pair of drill bits which are pivotally mounted between a pair of lift plates. T... | 09/24/2002 |
| 6439323 | Seismic shothole reaming module An apparatus for shaping boreholes used in seismic operations. A drill body is attached to a drill bit and is movable in axial and rotational directions. Selective operation of the drill body causes a moveable sleeve to operate a reaming bit to extend thr... | 08/27/2002 |
| 6378629 | Boring apparatus Apparatus for boring a hole from an inside of a tube outwardly perpendicular to a longitudinal axis of the tube comprises a drill shoe having a longitudinal axis and being positionable in the tube, the shoe having an inlet, an outlet perpendicular to the ... | 04/30/2002 |
| 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 |
| 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 |
| 6112835 | Drilling apparatus having a radially displaceable reamer A drilling tool for boring in earth and rock formations includes a pilot bit which defines a longitudinal tool axis and includes a cam part having a cam axis arranged eccentrically relative to the tool axis. A reamer includes a hollow reamer body mounted ... | 09/05/2000 |
| 5971085 | Downhole unit for use in boreholes in a subsurface formation A downhole unit for use in subsurface boreholes, for example a bias unit for imparting a lateral bias to the drill bit to control the direction of drilling, includes a main body and a number of pads pivotally mounted on the main body for engagement with t... | 10/26/1999 |
| 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 |
| 5934394 | Drill means The invention relates to drill means of the type to drill and ream a hole in the ground in advance of a trailing casing tube. Drill means able to drill an oversize hole, and yet allow the drill means to be withdrawn through the casing tube when in place i... | 08/10/1999 |
| 5590724 | Underreaming method An underreamer which may be mounted on a core drill to allow single phase underreaming or creation of a bore hole of larger diameter beneath a pilot hole. A plurality of levers are powered by a plurality of corresponding jacks which are adapted to exert p... | 01/07/1997 |
| 5259469 | Drilling tool for percussive and rotary drilling A drilling tool for percussive and rotary drilling in advance of a trailing casing tube (20) has a reamer (15) pivotally journalled and an eccentric shaft (12) rearwardly of a centric pilot bit (11). The reamer (15) has an eccentric portion (32) carrying ... | 11/09/1993 |
| 5219246 | Drills for piles and soil stabilization, and drilling method A drilling assembly (210) for in-situ cast piles has a drill stem (211) with a helical flyte (212). A drilling head (224), with teeth (225), and a belling tool (226), with retractable cutting tools (227) are mounted on, in driving engagement with, the non... | 06/15/1993 |
| 5186265 | Retrievable bit and eccentric reamer assembly A retrievable drill bit and cutter or reamer assembly includes a fluid-drive motor, an eccentric cutter part and a concentric bit in assembly and insertable in and retrievable from the interior of a drill stem without removing the drillstem from a wellbor... | 02/16/1993 |
| 5180209 | Apparatus for cutting recessed grooves into concrete and rock material Recessed grooves are cut into bore hole walls of concrete or rock materials for the purpose of interconnecting two components of such materials at an interface between these components. These recessed grooves are cut by material removing tools which can b... | 01/19/1993 |
| 5139099 | Excavation tool An excavation tool, in which a device is provided which receives the striking force of a hammer and the rotational force of a hammer cylinder, in a bottom surface of which at least three axle holes are provided displaced from a center of the device and at... | 08/18/1992 |
| 5052503 | Eccentric drilling tool An eccentric drilling tool comprises a guide member (10) rotatably centered by the mouth of a casing tube (11) that follows the tool downhole during drilling. A pilot bit (23) on the guide member (10) is provided with axially oriented hard metal pilot but... | 10/01/1991 |
| 4978258 | Cutting tool A cutting tool for forming undercuts in boreholes includes a cutting member pivotally and rotatably supported in a tubular drive shaft. The combination of the drive shaft and cutting tool provide a ball joint so that the cutting tool is pivotally supporte... | 12/18/1990 |
| 4962822 | Downhole drill bit and bit coupling A downhole impact drill having a drill bit head with a drill bit sector for drilling an enlarge hole upon rotation of the drill. The bit is mounted within a chuck for movement between a retracted, working position in which the bit is coaxially mounted for... | 10/16/1990 |
| 4874046 | Groove cutter for concrete bores The invention relates to improvements in rotary groove-cutting tools of the type having a rotatable center shaft and two or more generally arcuate flyweight subassemblies mounted for rotational movement with the center shaft, each such subassembly when th... | 10/17/1989 |
| 4770259 | Drill tool A drill tool for rotary and/or percussion drilling includes a drill string and a cutting apparatus connected to a lower end of the drill string. The cutting apparatus has an intermediate portion which is rotatable with the drill string and includes an out... | 09/13/1988 |
| 4627180 | Excavating bucket An open ended cylindrical casing is provided with a pair of semicircular blades rotatably mounted to the lower open end of the casing so that the blades may be rotated from a digging position where they project downward from the lower end of the casing to... | 12/09/1986 |
| 4440244 | Drill tool A drill tool for rotary and/or percussion drilling with drill rod means (14) within casing tube means (15) comprises a centric cutting bit (11) and an eccentric reamer cutter (12), both provided with hard metal inserts. For purposes of obtaining a life of... | 04/03/1984 |
| 4366988 | Sonic apparatus and method for slurry well bore mining and production A well bore is formed which runs down to an underground region having deposits of mineral material to be mined, by installing a casing or a drill pipe into the ground. A piping assembly is placed in the bore hole through the casing and the mineral materia... | 01/04/1983 |
