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| Number | Title | Issue Date |
| 7416035 | Shaped inserts with increased retention force A shaped insert that includes a top portion, and a grip length, wherein the grip length is modified to have a non-uniform cross sectional area is disclosed. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is modifi... | 08/26/2008 |
| 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 |
| 7267187 | Braze alloy and method of use for drilling applications A down hole cutting tool includes a cutting element support structure. The cutting element support structure has at least one cavity formed therein. A cutting element is disposed in the cavity. Braze alloy is also disposed in the cavity between the cutting element a... | 09/11/2007 |
| 6874388 | Method for hardfacing roller cone drill bit legs A method is disclosed for applying hardfacing to a shirttail portion of a roller cone drill bit, including masking around the shirttail portion of the bit and operating a high pressure/high velocity oxygen fuel torch to apply the hardfacing to the shirttail portion.... | 04/05/2005 |
| 6634427 | Drill string section with internal passage Drill string sections are provided comprising internal passages that may be used to facilitate the electrical or hydraulic connection of multiple devices, such as sensors, arranged at spaced apart positions along the length of the drill sections. Methods ... | 10/21/2003 |
| 6568491 | Method for applying hardfacing material to a steel bodied bit and bit formed by such method A graphite or silicate plug is coated with a refractory metal and positioned in the cutter pocket of a steel bodied bit as molten hardfacing material is applied to the bit surface under high temperature conditions. The refractory metal cooperates with the... | 05/27/2003 |
| 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 |
| 5963775 | Pressure molded powder metal milled tooth rock bit cone A milled tooth shaped rotary cone drill bit for drilling oil wells and the like manufactured using a powder metallurgy process in which an alloy powder is pressure molded into the desired bit shape, sintered, and precision machined.... | 10/05/1999 |
| 5893204 | Production process for casting steel-bodied bits Steel bit bodies are manufactured in a production process that employs polystyrene patterns in a lost foam casting process. The patterns are machined to permit the formation of complex shapes that cannot be reproduced in simple patterns that are extractab... | 04/13/1999 |
| 5839525 | Directional drill bit A roller cone or drag-type drill bit for use in drilling subsurface formations, especially useful for directional drilling, has a bit body with a shank portion for connection to a drill string, and a crown portion. Breaker slots are formed in the bit body... | 11/24/1998 |
| 5829539 | Rotary drill bit with hardfaced fluid passages and method of manufacturing A rotary drill bit, for drilling holes in subsurface formations, comprises a bit body, cutting structures mounted on the bit body, and a fluid supply system for supplying drilling fluid to the surface of the bit body, to cool and clean the cutting structu... | 11/03/1998 |
| 5791423 | Earth-boring bit having an improved hard-faced tooth structure An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter includes a plurality of teeth formed integrally with the cutter and arranged in circumferential rows. Each tooth has inner and outer ends, leading and... | 08/11/1998 |
| 5740871 | Flow diverter ring for a rotary drill bit and method A rotary cone drill bit for forming a borehole having a bit body with an upper end portion adapted for connection to a drill string. A number of angularly-spaced support arms formed to extend from the bit body. Each support arm has an inside surface with ... | 04/21/1998 |
| 5636700 | Roller cone rock bit having improved cutter gauge face surface compacts and a method of construction A roller cone rock bit (10) is provided that has improved cutter cone gauge face surface compacts. The roller cone rock bit (10) includes a bit body (12) having at least one downwardly extending arm (28) terminating in a spindle (30). A cutter cone (20) h... | 06/10/1997 |
| 5630479 | Cutting element for drill bits A cutting element which has a metal carbide stud having a conic tip formed with a reduced diameter hemispherical outer tip end portion of said metal carbide stud. A layer of polycrystalline material, resistant to corrosive and abrasive materials, is dispo... | 05/20/1997 |
| 5608162 | Method and system of trajectory prediction and control using PDC bits A method of forming a PDC drilling bit including the steps of imposing a side drilling direction on the bit, determining a total bit side force acting on the bit, computing a walk angle between the total side force and the side drilling direction, and mod... | 03/04/1997 |
| 5606895 | Method for manufacture and rebuild a rotary drill bit A rotary cone drill bit having a one-piece bit body with a lower portion having a convex exterior surface and an upper portion adapted for connection to a drill string. The drill bit will generally rotate around a central axis of the bit body to form a bo... | 03/04/1997 |
| 5590728 | Elements faced with superhard material A preform element, such as a cutting element for a drag-type drill bit, includes a facing table of superhard material having a front face, a peripheral surface, and a rear surface bonded to a substrate which is less hard than the superhard material. The r... | 01/07/1997 |
| 5590727 | Tool component A tool component comprises abrasive compact, typically a diamond abrasive compact, having a flat working surface which presents a cutting edge and an opposite surface bonded to a surface of a cemented carbide substrate to define an interface having at lea... | 01/07/1997 |
| 5579856 | Gage surface and method for milled tooth cutting structure A milled tooth (22) is provided having a back face (38), including an upper back face surface (58) and a lower back face surface (60). A tip or top surface (36) is provided below the upper back face surface (58). The upper back face surface (58) is in a r... | 12/03/1996 |
| 5456141 | Method and system of trajectory prediction and control using PDC bits A method of forming a PDC drilling bit including the steps of imposing a side drilling direction on the bit, determining a total bit side force acting on the bit, computing a walk angle between the total side force and the side drilling direction, and mod... | 10/10/1995 |
| 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 |
| 5439068 | Modular rotary drill bit A rotary cone drill bit for forming a borehole having a one-piece bit body with a lower portion having a convex exterior surface and an upper portion adapted for connection to a drill string. The drill bit will generally rotate around a central axis of th... | 08/08/1995 |
| 5388484 | Method of manufacturing diamond-impregnated drilling crowns A method of manufacturing drilling crowns for cylindrical diamond drilling tool bits affords a waste-free fabrication of the drilling crowns impregnated with diamond particles. In a first step an annular axially extending middle or intermediate zone impre... | 02/14/1995 |
| 5383525 | Threaded ring retention mechanism A method of manufacturing a rolling cutter drill bit of the kind where each cutter is rotatably mounted on a bearing spindle on the bit body and is retained on the spindle by a threaded retention ring in screw-threaded engagement with the cutter. The rete... | 01/24/1995 |
| 5379853 | Diamond drag bit cutting elements A unitized polycrystalline composite diamond stud type drag bit cutter having no high temperature braze of a PDC wafer to a carbide stud is disclosed. The diamond cutting surface may be planar, convex, curved or a truncated cone. The unitized construction... | 01/10/1995 |
| 5282513 | Thermally stable polycrystalline diamond drill bit A diamond drag type drill bit for drilling in an earthen formation consists of a body forming a first cutting end formed from a matrix material and a second open threaded pin end. The first cutting end consists of a multiplicity of substantially radially ... | 02/01/1994 |
| 5111895 | Cutting elements for rotary drill bits A cutting element for a rotary drill bit comprises a thin superhard table of polycrystalline diamond material, defining a front cutting face, bonded to a less hard substrate. The substrate is formed from a material containing at least a proportion of tung... | 05/12/1992 |
| 5033559 | Drill bit with faceted profile A drag bit with a faceted profile and method of its manufacture by which the facets provide for planar mold surfaces upon which cores having planar ends can completely contact the surface of the mold. The invention is particularly though not exclusively a... | 07/23/1991 |
| 4947945 | Relating to cutter assemblies for rotary drill bits A cutter assembly, for a rotary drill bit, comprises a preform cutting element mounted on a carrier in the form of a stud or post received in a socket in the bit body. The carrier is a metal matrix composite, formed by sintering, hot-pressing or by an inf... | 08/14/1990 |
| 4685359 | Method of hardfacing steel bodied bits A method of manufacturing a steel bodied bit is shown in which a hardfacing of a highly conformable metal cloth containing hard, wear resistant particles is applied to the bit face as well as to the interior of the bit nozzle openings. By hardfacing the n... | 08/11/1987 |
| 4597438 | Swivel bar apparatus for use with steel and other types of sucker rods A new and improved sinker bar has a substantial portion of its body square in cross section which increases rigidity and decreases wall to wall contact downhole in the production of fluids utilizing a sucker rod string. In addition, when the bars are used... | 07/01/1986 |
| 4452325 | Composite structure for cutting tools A cutting tool comprises a compact bundle of elongated, substantially cylindrical fibers or rods formed from a cemented metal carbide material. The bundle of fibers is shrink-fitted within a metal collar to form a long-wearing cutting tool.... | 06/05/1984 |
| 4417629 | Drill bit and method of manufacture A method of making a rolling cutter drill bit involving the steps of forming a body member having an upper portion adapted to be threaded and passaging therein, forming at least one arcuate recess in the lower end of the body member, providing a lug assem... | 11/29/1983 |
