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| Number | Title | Issue Date |
| 7350584 | Formed tubulars A method of lining a drilled bore comprises running a tubular into a drilled bore and then corrugating the tubular in the bore. The tubular may also be expanded in the bore. In other aspects of the invention the tubular is corrugated prior to running into the bore a... | 04/01/2008 |
| 7308944 | Expander tool for use in a wellbore The present invention generally relates to apparatus and methods for expanding a tubular. In one embodiment, an expander tool includes a body having at least one recess therein. An expansion assembly disposable in the at least one recess includes a piston that outwa... | 12/18/2007 |
| 7308949 | Concrete drill A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) cont... | 12/18/2007 |
| 7225881 | Passive logging sonde auger tool The auger is attached to a spiral gear and a spring, the apparatus then being connected to the downhole, leading end of the logging sonde. When the auger nose of the modified sonde assembly strikes any of various obstructions on the sidewall that cause it to lose mo... | 06/05/2007 |
| 7219752 | System and method for damping vibration in a drill string A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define... | 05/22/2007 |
| 7204321 | Concrete drill A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) cont... | 04/17/2007 |
| 7182152 | Sampling isolator A soil sampling system that in one embodiment includes a drill rod, a sampler or core barrel and an adapter coupling, for connecting the sampler barrel to the drill rod. In one embodiment the drill rod provides vibratory drilling movement, and the sampler barrel col... | 02/27/2007 |
| 7174803 | Steering shaft for motor vehicles A steering shaft for motor vehicles which comprises an inner and an outer shaft part. Each shaft part has a polygonal cross section. The shaft parts engage one another in telescoping fashion and are positively connected to one another by barrel-shaped rolls that are... | 02/13/2007 |
| 7163069 | Telescopable boring rod mechanism The invention relates to a telescopable boring rod mechanism with at least two mutually displaceable Kelly rods, which are equipped with means for transmitting a torque to the adjacent Kelly rod. At least one of the Kelly rods is constructed from at least two rod se... | 01/16/2007 |
| 7036612 | Controllable magneto-rheological fluid-based dampers for drilling A damping apparatus and method for a drillstring comprising a bit comprising providing to the drillstring a damping mechanism comprising magnetorheological fluid and generating an electromagnetic field affecting the magnetorheological fluid in response to changing a... | 05/02/2006 |
| 6994628 | Locking swivel apparatus with replaceable internal gear members A locking swivel apparatus is provided. The locking swivel includes an upper body portion having a counter bore about a cylindrical axis and a mandrel receivable in the counter bore. The apparatus further includes a locking arrangement, including at least one replac... | 02/07/2006 |
| 6945338 | Drilling bit assembly and apparatus A drill bit comprises a shank member (31), a bit body (32) provided with cutters (33) and flexible material (35) between the shank (31) and the bit body (32) allowing relative tilting movement therebetween to reduce adverse ... | 09/20/2005 |
| 6942394 | Bearing race support without distortion A race for a bearing, which is mountable to a mount, has an annular bearing surface with a center axis defining an axis of rotation for the bearing and mutually perpendicular radial and transverse directions relative thereto. The race also has a radial wall that is ... | 09/13/2005 |
| 6916248 | Flexible coupling Flexible couplings are provided comprising a male member disposed within a female member in a spaced apart configuration, with the space being filled, at least partially, with an elastically deformable material. The male and female members comprise features that pre... | 07/12/2005 |
| 6808455 | Torsional shock absorber for a drill string A torsional shock absorber dampens rotary shock loading on a well drill string. An outer housing has drive splines on an inner surface. A mandrel is located within the outer housing and has drive splines on an outer surface that fit between the drive splines on the ... | 10/26/2004 |
| 6364039 | Vibration damping tool A vibration damping apparatus including an annular housing, a cavity between an internal diameter and an external diameter of the housing, and a substantially solid vibration damping material disposed in the cavity. The vibration damping material has a de... | 04/02/2002 |
| 6332841 | Floating cushion sub A cushion sub for absorbing both axial and torsional vibration in a drill string and including an outer casing connectable at one end to a section of a drill string, and an inner piston reciprocally mounted in a cylinder within the casing, the piston havi... | 12/25/2001 |
| 6098726 | Torque transmitting device for rotary drill bits A torque transmitting device for use with a rotary drill bit connected to a drill collar, comprises a first member connected to the drill collar, a second member connected to the drill bit, and coupling means connecting the two members together for rotati... | 08/08/2000 |
| 5833541 | Elastomeric joints having interlocking threaded portions An elastomeric joint that can be used, as part of an articulated coupling in a progressive cavity device, including using the articulated coupling for converting the complex motion of the rotor into simple rotation. The coupling includes two shafts couple... | 11/10/1998 |
| 5772514 | Torque control device for rotary mine drilling machine A device reducing the deleterious torque in a shock absorbing, rotary drive coupling unit used with a rotary mine drilling machine comprising: a drive plate connectable to a drive shaft of the rotary drilling machine, a driven plate connectable to a drive... | 06/30/1998 |
| 5588916 | Torque control device for rotary mine drilling machine A device reducing the deleterious torque in a shock absorbing, rotary drive coupling unit used with a rotary mine drilling machine comprising: a drive plate connectable to a drive shaft of the rotary drilling machine, a driven plate connectable to a drive... | 12/31/1996 |
| 5476421 | Shock absorbing assembly A shock absorbing assembly for a drilling machine utilizing a down hole hammer having a driver member for receiving input forces, a driven member for transmitting forces from the driver member to an attached drill string, and a resilient member which is p... | 12/19/1995 |
| 5447472 | Articulated coupling for use with a progressive cavity apparatus A progressive cavity device including an articulate coupling for converting the complex motion of the rotor into simple rotation. The coupling includes two shafts coupled to one another by joint assemblies connected to opposite ends of an intermediate sha... | 09/05/1995 |
| 5372548 | Longitudinal and rotary shock absorber for rotary and percussion drill bits A longitudinal and rotary vibration dampener or shock absorber for rotary and percussion drill bits comprises a resilient element to absorb axial compression loads, preferably in a compression mode; a resilient element to absorb axial tension loads, prefe... | 12/13/1994 |
| 5224898 | Cushion connector A cushion connector (10) used for above ground drilling has pin (11) and box (12) components at opposite ends. A housing (13) extends axially between the pin and box components. A drive spline (22) is operably connected to one of the components and extend... | 07/06/1993 |
| 5083755 | Face shock absorber for extracting core-collecting pipes Face shock absorber for extracting core-collecting pipes used for the drilling of solid mineral resources, which is incorporated in the drilling unit above the rock-breaking tool. It comprises a housing, the opposite ends of which are connected to a top a... | 01/28/1992 |
| 4844181 | Floating sub A drill string is rotated by a top drive system and includes a floating sub which interconnects the upper end thereof with the drill pipe, and a bit at the lower end thereof. The bit is connected to the lower end of the drill pipe by means of a shock abso... | 07/04/1989 |
| 4779852 | Vibration isolator and shock absorber device with conical disc springs A vibration isolator and shock absorber system which provides excellent protection to sensors against the deleterious effects of shock and vibration even under severe drilling conditions is presented. The vibration isolator and shock absorber system is en... | 10/25/1988 |
| 4759738 | Floating cushion sub A floating cushion connection member is operable between a power head and a drill string member. A first cap member is mounted about the periphery of a piston. A washpipe extends from within the bore of the piston to a mounting area in a second cap member... | 07/26/1988 |
| 4693317 | Method and apparatus for absorbing shock The present invention includes devices for absorbing shock in a tool string within a borehole. These components may serve together in a variety of configurations to form a shock absorbing system. A longitudinal shock absorber is connected in the tool stri... | 09/15/1987 |
| 4600062 | Shock absorbing drilling tool A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel slideably mounted within a... | 07/15/1986 |
| 4571215 | Vibration dampener apparatus A vibration dampener for use on top-drive rotary drills. The apparatus of the present invention comprises a generally cylindrical housing having a cylindrical side, a top, a bottom, and a central divider plate. The top of the housing has an externally thr... | 02/18/1986 |
| 4552230 | Drill string shock absorber A telescopic shock absorber for use in a drill string includes a resilient arrangement to cushion telescopic contraction and extension of the shock absorber in response to shock loads and vibrations imparted during drilling. The shock absorber operates in... | 11/12/1985 |
| 4518888 | Downhole apparatus for absorbing vibratory energy to generate electrical power In a drilling operation fatique producing vibrational motion is produced in the drill string in the form of longitudinal and torsional load variations at the drill bit and throughout the bottom hole assembly. These load variations occur at least partially... | 05/21/1985 |
| 4498548 | Well jar incorporating elongate resilient vibration snubbers and mounting apparatus therefor For use in a well jar, a mounting apparatus for resilient elongate snubbers is described. In the preferred and illustrated embodiment, parallel elongate resilient snubbers are formed on metallic backing strips. They are profiled to define sloping elongate... | 02/12/1985 |
| 4443206 | Well tool A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel rotationally and slideably... | 04/17/1984 |
| 4439167 | Shock absorber assembly A shock absorber assembly adapted to be used with a drill string dampening intermittent shocks and vibrational forces encountered with a drill string, the shock absorber assembly including a mandrel, a tubular body reciprocally mounted with respect to the... | 03/27/1984 |
| 4428443 | Shock absorbing tool for connection to a drill column A shock absorbing tool is provided for connection to a drill column. The drill column includes a drill bit and is positioned in a bore formed in the earth. The shock absorbing tool is an integral, resilient cylindrical member having a number of open secti... | 01/31/1984 |
| 4398898 | Shock sub A novel shock sub is disclosed for use in a drill string for absorbing longitudinal and impact loads. A tubular housing is provided for connection to one part of a drill string and a tubular mandrel extends into the housing for longitudinal sliding moveme... | 08/16/1983 |
| 4387885 | Shock absorber assembly for absorbing shocks encountered by a drill string A shock absorber assembly for absorbing shocks encountered by a drill string wherein the shock absorber assembly is for use with a drill string having a working fluid therein and includes a body member affixed to the drill string, a mandrel mounted for re... | 06/14/1983 |
