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| Number | Title | Issue Date |
| 8122979 | Offset rock bit with pull back adapter An offset rock bit (12) has a steering face (28) and a shoe (30) provided by a recess formed into the steering face (28). A slot (66) formed into the shoe (30) for receiving a pull back adapter (50) in a centrally loc... | 02/28/2012 |
| 8061453 | Drill bit with asymmetric gage pad configuration A drill bit for drilling a borehole in earthen formations. In an embodiment, the bit comprises a bit body having a bit axis and a bit face. In addition, the bit comprises a pin end extending from the bit body opposite the bit face. Further, the bit comprises a plura... | 11/22/2011 |
| 8042625 | Drilling tool A drilling tool has a body with a main drilling region and a pilot drilling region, eccentric to the main drilling region. The main drilling region has main blades and the pilot drilling region has pilot blades. The main drilling region has a main pass-through diame... | 10/25/2011 |
| 7694755 | System, method, and apparatus for variable junk slot depth in drill bit body to alleviate balling An earth boring drill bit design for alleviating balling varies the junk slot depth in junk slots subject to balling from the other junk slots. Using variable depth bit bodies enhances the hydraulic characteristics of the bit as well as assists in the placement of t... | 04/13/2010 |
| 7549490 | Arrangement of roller cone inserts A drill bit having cutting elements disposed on a roller cone surface in a non-linear pattern, wherein at least one of the cutting elements is asymmetrical to its axis of orientation. Also, a method for selecting and adjusting a cutting element orientation based on ... | 06/23/2009 |
| 7360612 | Roller cone drill bits with optimized bearing structures A roller cone drill bit may include optimally designed bearing structures and cutting structures. The roller cone drill bit may include three cone assemblies rotatably mounted on respective spindles via respective bearing structures. Each cone assembly may have a re... | 04/22/2008 |
| 7334652 | Roller cone drill bits with enhanced cutting elements and cutting structures Roller cone drill bits are provided with cutting elements and cutting structures optimized for efficient drilling of soft and medium formations interspersed with hard stringers. The cutting elements and cutting structures may be satisfactorily used to drill downhole... | 02/26/2008 |
| 7228922 | Drill bit A drill bit has a pair of cutting teeth with cutting elements extending from a cutting end portion of the drill bit. Each cutting tooth extends radially, outwardly parallel to a longitudinal axis of the drill steel. The cutting teeth are juxtaposed with one another ... | 06/12/2007 |
| 7137462 | Drill bit A drill bit constructed to improve a tip end of the cutting pointed portion to efficiently discharge chips from a center portion of a crush face of a drill hole to thereby improve cutting efficiency, is disclosed. A plurality of cutting blades 3a, 3... | 11/21/2006 |
| 7086489 | Multi-lobed cutter element for drill bit Disclosed are cutter elements for a drill bits having particular, but not exclusive, application on the nose portion of the cone cutters of a rolling cone bit. The cutter elements include a base, a cutting portion, and a plurality of cutting lobes extending radially... | 08/08/2006 |
| 7086808 | Method and apparatus for on-grade boring A method for installation of an underground pipe includes an initial step of boring a pilot hole through the ground at a predetermined grade angle by extending a drill string having a steerable boring bit mounted thereon through the ground. Upon reaching an end loca... | 08/08/2006 |
| 7056065 | Device and method for changing lines A device for replacing lines without excavation including an annular overdrilling head and a drive for rotating a front module arranged on the drilling head. ... | 06/06/2006 |
| 7036609 | Sonde housing and method of manufacture A sonde (transmitter) housing having a one-piece design for improved housing rigidity. The housing includes a mechanically-adjustable mounting configuration adaptable to a variety of sonde applications. A method of making the sonde housing in a one-piece design and ... | 05/02/2006 |
| 7028790 | Rotary drill bit A drill bit includes a body defining an axis and first and second cylindrical portions, a coupling adapted for connection with a rotary driver, and a depth stop adjustably secured to a first portion by a plurality of adjusting fasteners in a manner to limit penetrat... | 04/18/2006 |
| 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 |
| 6923362 | Integral channels in metal components and fabrication thereof An internal channel in a metal body for use in applications where internal fluid flow within a metal body is desired, as in a heat exchanger. The internal channel is formed in the metal body by frictionally stirring with a pin plunged into the metal body, and traver... | 08/02/2005 |
| 6918455 | Drill bit with large inserts A percussion drill bit is provided that has at least two different pluralities of inserts extending from the bit head to better match the conditions seen on the bit head during drilling. The preferred embodiment has a plurality of large inserts with a polycrystallin... | 07/19/2005 |
| 6913098 | Sub-reamer for bi-center type tools An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force... | 07/05/2005 |
| 6789635 | Drill bit for directional drilling in cobble formations A drill bit configured for use in horizontal directional boring includes a spoon-shaped body with a rearwardly angled or inclined arcuate front end face that widens from a leading edge to a trailing edge in a circumferential direction, the front face sloping rearwar... | 09/14/2004 |
| 6695080 | Reaming apparatus and method with enhanced structural protection A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus. The reaming apparatus also provides... | 02/24/2004 |
| 6634444 | Drill bit for trenchless drilling A drill bit for trenchless drilling includes a bit body defining a longitudinal axis about which the drill bit is rotated during a trenchless drilling operation. Two sets of cutting teeth are mounted at a front end of the bit body, the sets disposed on op... | 10/21/2003 |
| 6588520 | Rock drill A rock drill has at least one hard material insert (2) with at least two cutting edges (3, 7) consisting of hard material and extending radially to the drill axis (A), whereby, in a radial range of 20% to 50% of their drilling radius, at least two cutting... | 07/08/2003 |
| 6588515 | Drill bit for directional drilling The invention provides a rock drilling bit with a plurality of cutting teeth raked into the cut of the drilling bit. Such teeth are oriented at an angle of at least about 30 degrees relative to an imaginary line normal to a front surface of the cutting he... | 07/08/2003 |
| 6533052 | Drill bit for impact-assisted directional boring A drill bit suited for impact-assisted directional boring in rock includes a bit body having a frontwardly facing, circular main cutting surface having a number of main cutting teeth disposed thereon. A gage cutter extends radially outwardly from the main... | 03/18/2003 |
| 6516899 | Method and apparatus for directional boring under mixed conditions A drill head of directional boring includes a bit, a holder for a device for detecting angular orientation of the bit, and a hammer including a striker, wherein the bit assembly, holder and hammer are connected head to tail with the bit at a front end. Th... | 02/11/2003 |
| 6474425 | Asymmetric diamond impregnated drill bit A drill bit including a bit body and a plurality of blades formed in the bit body. The blades are formed, at least in part, from a base matrix material that on one embodiment is impregnated with abrasive particles. One side of the bit is formed, with resp... | 11/05/2002 |
| 6470979 | Sonde housing structure An apparatus for mounting an electronic device therein for use in an underground boring machine includes an elongated housing having an elongated, lengthwise central cavity opening at one end thereof, a cartridge containing a sonde therein, which cartridg... | 10/29/2002 |
| 6450269 | Method and bit for directional horizontal boring A bit for directional boring according to the invention includes a bit body having a frontwardly facing sloped face effective for steering the bit in dirt. The sloped face defines a steering plane that defines an acute included angle relative to a lengthw... | 09/17/2002 |
| 6422328 | Dual cutting mill A rotating tool for milling or drilling in a well bore, having one or more rotating cutting structures, with each cutting structure rotating about its own axis, and with the cutting structures rotating about the axis of the tool. The rotational axis of th... | 07/23/2002 |
| 6422782 | Apparatus for mounting an electronic device for use in directional drilling The present invention provides an improved apparatus for mounting an electronic device such as a sonde therein for use in directional drilling. Such an apparatus includes an elongated housing having projections at opposite ends of the housing for connecti... | 07/23/2002 |
| 6397958 | Reaming apparatus and method with ability to drill out cement and float equipment in casing A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus.... | 06/04/2002 |
| 6321858 | Bit for directional drilling An improved drill bit for directional drilling includes a housing or headpiece having means at a rear end thereof for mounting the bit on a trailing component of a drill head, and passages for ejection of drilling fluid into a borehole. A first axle is mo... | 11/27/2001 |
| 6308790 | Drag bits with predictable inclination tendencies and behavior A drill bit with dropping tendencies includes an active region, a passive region, a biased mass distribution, an uneven torque generation, and an imbalance force vector directed toward the middle of the active region. Cutting elements in the active region... | 10/30/2001 |
| 6296069 | Bladed drill bit with centrally distributed diamond cutters A drill bit as used in particular in the oil well drilling field comprising a central body (2), cutting blades (3) protruding with respect to the body (2), both at the front of this body according to a drill direction and at the sides of this same body (2... | 10/02/2001 |
| 6263983 | Apparatus for directional drilling The invention provides an improved apparatus for directional boring and in particular an improved system for boring through hard and rocky substrates frequently encountered when boring under obstacles such as roadways. According to one aspect of the inven... | 07/24/2001 |
| 6247544 | Duckbill with cutting teeth A directing blade for a directional boring machine includes a blade body which extends along a longitudinal axis from an attachment end to a free end. The free end has a plurality of cutting teeth disposed in a non-symmetrical pattern relative to the long... | 06/19/2001 |
| 6148935 | Joint for use in a directional boring apparatus A joint is provided for coupling a pair of elongated members such as a sonde housing and starter rod end to end. Such a joint includes a projection extending in a lengthwise direction from one end of one of the elongated members and a socket in an end of ... | 11/21/2000 |
| 6125950 | Collared boring bit A collared boring bit which interfaces with a boring head whereby shear forces developed during a boring operation are transmitted through the collar to the boring head, with minimal shear force being carried by the bolts. A bit collar is welded to a bori... | 10/03/2000 |
| 6116356 | Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter A method and apparatus for reaming or enlarging a borehole with enhanced stability. A pilot stabilization pad (PSP) having an axially and circumferentially tapered entry surface and a circumferential transition surface thereabove is employed to enhance th... | 09/12/2000 |
| 6039131 | Directional drift and drill PDC drill bit A PDC bit for cutting a hole below a point in a formation, the diameter of the hole being greater than the diameter of the hole above the point, comprising: a bit body having an axis of rotation, a first cutting portion having a first radial extent from t... | 03/21/2000 |
