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| Number | Title | Issue Date |
| 8157026 | Hybrid bit with variable exposure An earth boring drill bit comprising a bit body having a bit profile including nose, shoulder, and gage sections; a plurality of fixed cutting elements secured to the body and defining a fixed cutter profile; and a roller cone rotatably secured to the body, the roll... | 04/17/2012 |
| 8141664 | Hybrid drill bit with high bearing pin angles A hybrid drill bit having at least two rolling cutters, each rotatable around an axis of rotation, at least one of the rolling cutters having a high pin angle, and at least one fixed blade. The pin angle can encompass pin angles above 39 degrees to less than 393 deg... | 03/27/2012 |
| 8047307 | Hybrid drill bit with secondary backup cutters positioned with high side rake angles A hybrid drill bit may have a bit body, at least one blade extending longitudinally and radially outward from the face, at least one rolling cutter assembly mounted on the bit body, at least one primary cutter, and at least one cutter set including a first cutter an... | 11/01/2011 |
| 7845435 | Hybrid drill bit and method of drilling A hybrid drill bit having both roller cones and fixed blades is disclosed, and a method of drilling. The cutting elements on the fixed blades form a continuous cutting profile from the perimeter of the bit body to the axial center. The roller cone cutting elements o... | 12/07/2010 |
| 7841426 | Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit A hybrid drill bit having both roller cones and fixed blades is disclosed. The cutting elements on the fixed blades form a continuous cutting profile from the perimeter of the bit body to the axial center. The roller cone cutting elements overlap with the fixed cutt... | 11/30/2010 |
| 7819208 | Dynamically stable hybrid drill bit An earth-boring bit comprising a bit body configured at its upper extent for connection into a drillstring. A selected number of fixed blades extend downward from the bit body and a selected number of rolling cutters are mounted for rotation on the bit body. A plura... | 10/26/2010 |
| 7407525 | Fracture and wear resistant compounds and down hole cutting tools Fracture and wear resistant cutting elements are provided. Examples include a cutting element formed of a wear resistant material having a binder composition and a coarse grain size such that the portion of the cutting element formed of the wear resistant material h... | 08/05/2008 |
| 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 |
| 7331410 | Drill bit arcuate-shaped inserts with cutting edges and method of manufacture Disclosed are a variety of arcuate-shaped inserts for drill bits, and in particular, for placement in rolling cone cutters of drill bits. The arcuate inserts include 360° or ring-shaped inserts, as well as inserts of smaller arcuate length. The arcuate inserts are ... | 02/19/2008 |
| 7318492 | Rotary drill bit A drill bit for drilling a borehole with a steerable drilling system, the drill bit comprising a longitudinal axis, and a cutting profile with a leading face section blended with a curved region into a tapered gauge region having a tapered gauge profile. The tapered... | 01/15/2008 |
| 7303030 | Barrier coated granules for improved hardfacing material A hardfacing composition for a drill bit includes a carbide phase made from carbide particles having a barrier coating disposed thereon, and binder alloy. Also, a drill bit includes a steel bit body having hardfacing thereon and having at least one blade thereon, at... | 12/04/2007 |
| 7152701 | Cutting element structure for roller cone bit A roller cone drill bit includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body, and a single roller cone rotatably attached to the bearing journal. The single roller cone has a plurality of cutting elements, where ... | 12/26/2006 |
| 7152703 | Compact for earth boring bit with asymmetrical flanks and shoulders A tungsten carbide compact of an earth boring bit has a cutting tip that is generally chisel-shaped with substantially flat flanks converging to an elongated crest. One of the flanks is smaller and has a greater included angle relative to the axis of the compact tha... | 12/26/2006 |
| 7059430 | Hydro-lifter rock bit with PDC inserts A novel rolling cone rock bit includes a plurality of PDC or other cutters mounted to the leg of the drill bit and positioned to cut the troublesome corner of the bottomhole. The plurality of cutters may be the primary cutting component at gage diameter, or may be r... | 06/13/2006 |
| 6719073 | Single-cone rock bit having cutting structure adapted to improve hole cleaning, and to reduce tracking and bit balling A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body and a single roller cone rotatably attached to the journal. The roller cone has a plurality of inserts disposed ther... | 04/13/2004 |
| 6601661 | Secondary cutting structure A three cone roller bit with rolling cone cutters that are provided with both primary and secondary cutting elements. The primary cutting elements extend outwardly from lands on the outer surface of the cutter body. The secondary cutting elements are disp... | 08/05/2003 |
| 6595305 | Drill bit, hard member, and bit body A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward... | 07/22/2003 |
| 6536543 | Rotary drill bits exhibiting sequences of substantially continuously variable cutter backrake angles A rotary-type earth-boring drag bit with cutters oriented at varied rake angles and methods for designing such drag bits. Specifically, cutters that are located sequentially adjacent radial distances from a longitudinal axis of the drill bit have cutting ... | 03/25/2003 |
| 6394199 | Non-circular gauge reaming row inserts Disclosed is a wear resistant cutting insert for use in rolling cutter drill bits. The insert has a cylindrical shank that is readily fitted in an interfering manner into cylindrical sockets formed in the rolling cutter. The surface of die insert that eng... | 05/28/2002 |
| 6367568 | Steel tooth cutter element with expanded crest A cutter element for a drill bit. The cutter element has a base portion and an extending portion and the extending portion has either a zero draft or a negative draft with respect to the base portion. The non-positive draft allows more of the borehole bot... | 04/09/2002 |
| 6332503 | Fixed cutter bit with chisel or vertical cutting elements An array of chisel-shaped cutting elements are mounted to the face of a fixed cutter bit. Each cutting element has a crest and an axis which is inclined relative to the borehole bottom. The cutting elements have a hardened diamond exterior on all surfaces... | 12/25/2001 |
| 6241034 | Cutter element with expanded crest geometry A cutter element for a drill bit. The cutter element has a base portion and an extending portion and the extending portion has either a zero draft or a negative draft with respect to the base portion. The non-positive draft allows more of the borehole bot... | 06/05/2001 |
| 6167975 | One cone rotary drill bit featuring enhanced grooves A one cone drill bit is equipped with multiple jet flow guiding grooves along the cone. The multiple grooves connects to a circular groove axially centered on the nose end portion of the cone. The circular groove sweep the cuttings and mud flow across the... | 01/02/2001 |
| 6161634 | Cutter element with non-rectilinear crest A cutter element for a drill bit. The cutter element has a non-rectilinear crest. The non-rectilinear or curvilinear crest provides an advantageous distribution of the cutting forces across the body of the cutter elements and thus improves bit life. The c... | 12/19/2000 |
| 6119797 | Single cone earth boring bit The invention discloses a single cone earth boring bit which is adapted to be used for boring in oil fields, mining and geological prospecting. The single cone earth boring bit is composed of a bit body (1), gauge blocks (2), active cutting gauge teeth (4... | 09/19/2000 |
| 6026916 | Rotary drill arrangement A rotary drill arrangement comprising a combination spade drill body having a rotational axis, a shank portion, and a generally planar spade cutter portion with a pair of oppositely directed cutting edges extending radially of the axis, and a rotatable fr... | 02/22/2000 |
| 5544550 | Fabrication method for rotary bits and bit components A method of fabricating rotary bits for subterranean drilling by layering techniques such as are employed in rapid prototyping technology. Thin layers of powder may be sequentially deposited and fused or otherwise bonded to define the bit body, or thin sh... | 08/13/1996 |
| 5452770 | Rock bit and improved forging method for manufacturing thereof A method of manufacturing a roller cone type drill bit, or main body thereof, includes forging a monolithic main body forging comprising a shank blank extending longitudinally at one end and a plurality of circumferentially spaced leg stubs at the other e... | 09/26/1995 |
| 5433280 | Fabrication method for rotary bits and bit components and bits and components produced thereby A method of fabricating rotary drag bits for subterranean drilling by layering techniques such as are employed in rapid prototyping technology. Thin layers of powder may be sequentially deposited and fused or otherwise bonded to define the bit body, or th... | 07/18/1995 |
| 5176212 | Combination drill bit A drill bit for drilling a hole in the ground, with cutting elements annular by cutting a core which, when it has reached a certain height, is continuously crushed by teeth on rolling cones. By combining these two processes, cutting and crushing, in this ... | 01/05/1993 |
| 5145017 | Kerf-cutting apparatus for increased drilling rates An improved earth drilling bit and method that cuts at least one annular kerf ahead of at least one rolling cutter and provides for rock chip removal and bit cooling thereby increasing drilling rate and bit performance. One embodiment of the invention inc... | 09/08/1992 |
| 5027913 | Insert attack angle for roller cone rock bits The inserts for a roller cone of a multiple cone rock bit are positioned or angled in the cone to attack an earthen formation such that the inserts are subjected to more compressive forces and the formation is subjected to more shear forces as the roller ... | 07/02/1991 |
| 5016718 | Combination drill bit A drill bit for drilling a hole in the ground, with cutting elements annularly cutting a core which, when it has reached a certain height, is continuously crushed by teeth on rolling cones. By combining these two processes, cutting and crushing, in this m... | 05/21/1991 |
| 4936398 | Rotary drilling device A drill bit for earth boring purposes includes a drill bit body which is rotatable about a drilling axis, a single cutting member mounted rotatably on the body and a counter-reaction member also mounted on the body. The counter-reaction member extends par... | 06/26/1990 |
| 4892159 | Kerf-cutting apparatus and method for improved drilling rates An earth drilling bit that cuts concentric annular kerfs ahead of primary drilling means and thereby increases drilling rate. The bit includes a bit body having a lower end forming an annular cutter for cutting an outer annular kerf, an inner drill member... | 01/09/1990 |
| 4751972 | Revolving cutters for rock bits A mechanism is disclosed for rock bits whereby cutting elements, rotatably mounted to fixtures with journals, are constantly forced to rotate or precess by the interaction of the earth formation and the cutter. The cutters are fixed in skewed or offset po... | 06/21/1988 |
| 4630869 | Shield tunneling machine A shield tunneling machine comprises a tubular shield body, a partition wall provided in the shield body, a rotary shaft supported rotatably by the partition wall and extending longitudinally of the shield body, a cutter head disposed on the front end of ... | 12/23/1986 |
| 4527644 | Drilling bit A drilling bit comprising a drill body formed from a base portion and a crown portion having a plurality of cutting elements; the base and crown portions are interengaged by a connection portion. An external opening in the crown portion communicates with ... | 07/09/1985 |
| 4448269 | Cutter head for pit-boring machine A rotatable cutter head for a pit boring machine used in reverse circulation drilling. The cutter head has cutter arrays including rotary cutters and drag cutters and disposed radially and circumferentially spaced positions on the cutter head, the drag cu... | 05/15/1984 |
