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| Number | Title | Issue Date |
| 8109349 | Thick pointed superhard material In one aspect of the invention, a high impact resistant tool includes a superhard material bonded to a cemented metal carbide substrate at a non-planar interface. The superhard material has a substantially pointed geometry with a sharp apex having a radius of curvat... | 02/07/2012 |
| 8104550 | Methods for applying wear-resistant material to exterior surfaces of earth-boring tools and resulting structures Earth-boring tools include wear-resistant materials disposed in at least one recess formed in an exterior surface of a body thereof. Exposed surfaces of the wear-resistant material are substantially level with exterior surfaces of the body adjacent the wear-resistan... | 01/31/2012 |
| 8079429 | Methods of forming earth-boring tools using geometric compensation and tools formed by such methods Geometric compensation techniques are used to improve the accuracy by which features may be located on drill bits formed using particle compaction and sintering processes. In some embodiments, a positional error to be exhibited by at least one feature in a less than... | 12/20/2011 |
| 8074750 | Earth-boring tools comprising silicon carbide composite materials, and methods of forming same Earth-boring tools for drilling subterranean formations include a particle-matrix composite material comprising a plurality of silicon carbide particles dispersed throughout a matrix material, such as, for example, an aluminum or aluminum-based alloy. In some embodi... | 12/13/2011 |
| 8056652 | Barrier coated granules for improved hardfacing material using atomic layer deposition A hardfacing composition for a drill bit that includes an abrasive phase comprising a plurality of abrasive particles having a barrier coating deposited by atomic layer deposition disposed thereon; and a binder alloy is disclosed. Drill bits having hardfacing compos... | 11/15/2011 |
| 8016057 | Erosion resistant subterranean drill bits having infiltrated metal matrix bodies Subterranean drill bits having good erosion resistance, strength, toughness, and thermal stability are disclosed. The drill bits comprise a bit body carrying at least one cutting element and having an infiltrated metal matrix. The infiltrated metal matrix comprises ... | 09/13/2011 |
| 7997359 | Abrasive wear-resistant hardfacing materials, drill bits and drilling tools including abrasive wear-resistant hardfacing materials An abrasive wear-resistant material includes a matrix material and a plurality of −40/+80 ASTM mesh dense sintered carbide pellets. A rotary drill bit having an exterior surface and an abrasive wear-resistant material disposed on at least a portion of the exterior... | 08/16/2011 |
| 7975785 | Drilling systems including fiber-containing diamond-impregnated cutting tools Diamond-impregnated cutting tools including fibers and drilling systems incorporating such tools are described. The cutting tools contain a diamond-impregnated cutting portion that contains fibers made from carbon, glass, ceramic, polymer, and the like. The fibers m... | 07/12/2011 |
| 7954569 | Earth-boring bits The present invention relates to compositions and methods for forming a bit body for an earth-boring bit. The bit body may comprise hard particles, wherein the hard particles comprise at least one of carbide, nitride, boride, and oxide and solid solutions thereof, a... | 06/07/2011 |
| 7905301 | Earth boring drill bits made from a low-carbon, high-molybdenum alloy An earth boring bit formed from an alloy comprising a low carbon content and high molybdenum content is disclosed herein. The molybdenum content is greater than about 0.8% to about 1.15% by weight of the alloy. The carbon content may range up to about 0.16% by weigh... | 03/15/2011 |
| 7878275 | Matrix bit bodies with multiple matrix materials A drill bit that includes a bit body having a plurality of blades extending radially therefrom, the bit body comprising a first matrix region and a second matrix region, wherein the first matrix region is formed from a moldable matrix material; and at least one cutt... | 02/01/2011 |
| 7841428 | Polycrystalline diamond apparatuses and methods of manufacture Methods of manufacturing polycrystalline diamond are disclosed. More particularly, a mixture including diamond and fullerenes may be provided. Further, the mixture may be exposed to a high pressure, high temperature sintering process. In addition, a volume of polycr... | 11/30/2010 |
| 7823665 | Milling of cemented tubulars A method and apparatus for milling an item in a wellbore. The method and apparatus including providing a milling tool having one or more blades which are geometrically configured to resist deflection by distributing cutting forces in multiple directions. ... | 11/02/2010 |
| 7810587 | Drill bits comprising dual-phase tungsten carbide material The invention relates to a drill bit containing tungsten carbide powder having powder particles which have a core of cast tungsten carbide and a shell of tungsten monocarbide. ... | 10/12/2010 |
| 7703556 | Methods of attaching a shank to a body of an earth-boring tool including a load-bearing joint and tools formed by such methods Earth-boring rotary drill bits including a bit body attached to a shank assembly at a joint. In some embodiments, the joint may be configured to carry at least a portion of any tensile longitudinal and rotational load applied to the drill bit by mechanical interfere... | 04/27/2010 |
| 7703555 | Drilling tools having hardfacing with nickel-based matrix materials and hard particles An abrasive wear-resistant material includes a matrix and sintered and cast tungsten carbide granules. A device for use in drilling subterranean formations includes a first structure secured to a second structure with a bonding material. An abrasive wear-resistant m... | 04/27/2010 |
| 7661491 | High-strength, high-toughness matrix bit bodies A new composition for forming a matrix body which includes spherical sintered tungsten carbide and an infiltration binder including one or more metals or alloys is disclosed. In some embodiments, the composition may include a Group VIIIB metal selected from one of N... | 02/16/2010 |
| 7510034 | System, method, and apparatus for enhancing the durability of earth-boring bits with carbide materials An earth-boring drill bit having a bit body with a cutting component formed from a tungsten carbide composite material is disclosed. The composite material includes a binder and tungsten carbide crystals comprising sintered pellets. The composite material may be use... | 03/31/2009 |
| 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 |
| 7398840 | Matrix drill bits and method of manufacture A matrix drill bit and method of manufacturing a matrix bit body from a composite of matrix materials is disclosed. Two or more different types of matrix materials may be used to form a composite matrix bit body. A first matrix material may be selected to provide op... | 07/15/2008 |
| 7395884 | High-strength/high toughness alloy steel drill bit blank Drill bit reinforcing members or blanks of this invention are formed from high-strength steels having a carbon content less than about 0.3 percent by weight, a yield strength of at least 55,000 psi, a tensile strength of at least 80,000 psi, a toughness of at least ... | 07/08/2008 |
| 7395882 | Casing and liner drilling bits A casing bit, which may comprise a composite structure, for drilling a casing section into a subterranean formation, and which may include a portion configured to be drilled therethrough, is disclosed. Cutting elements and methods of use are disclosed. Adhesive, sol... | 07/08/2008 |
| 7392866 | Roof drilling system improvements The invention is embodied in a heavy duty drill bit for hard/soft rock drilling comprising a high fatigue-resistant, high alloy steel bit body having a PCD cutter member and an enlarged shank portion constructed to accommodate torsional forces at high thrust pressur... | 07/01/2008 |
| 7357200 | Earth auger An earth auger presents a shank having a spiral earth removing structure therearound. The structure first presents a series of spirally positioned housings with cutting teeth therein followed by a spiral cutting edge about the shank. The teeth are radially, vertical... | 04/15/2008 |
| 7353893 | Tool with a large volume of a superhard material In one aspect of the invention, a tool has a wear-resistant base suitable for attachment to a driving mechanism and also a hard tip attached to an interfacial surface of the base. The tip has a first cemented metal carbide segment bonded to a superhard material at a... | 04/08/2008 |
| 7350600 | Shirttails for reducing damaging effects of cuttings An earth-boring bit has a bit body that includes head sections, each having depending bit legs with a circumferentially extending outer surface, a leading side, and a trailing side. A bearing shaft depends inwardly from each of the bit legs for mounting a cutter. Th... | 04/01/2008 |
| 7347292 | Braze material for an attack tool In one aspect of the invention, a tool has a wear-resistant base suitable for attachment to a driving mechanism and also a hard tip attached to an interfacial surface of the base. The tip has a first cemented metal carbide segment bonded to a superhard material at a... | 03/25/2008 |
| 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 |
| 7264879 | Composite constructions with oriented microstructure In one embodiment, composite constructions of the invention are in the form of a plurality of coated fibers bundled together to produce a fibrous composite construction in the form of a rod. Each fiber has a core formed from a hard phase material, that is surrounded... | 09/04/2007 |
| 7258177 | Fracture and wear resistant compounds and rock bits An insert for a rock bit that includes tungsten carbide particles, and a cobalt binder disposed around the particles, wherein a grain size of the tungsten carbide particles and a content of the cobalt binder are selected to provide a fracture toughness of at least a... | 08/21/2007 |
| 7240746 | Bit gage hardfacing An earth boring bit has at least one rotatable cone with a gage surface that engages a sidewall of a wellbore as the bit rotates. The gage surface has hardfacing bars spaced circumferentially apart from each other. A first group of the hardfacing bars extends from t... | 07/10/2007 |
| 7216727 | Drilling bit for drilling while running casing A drill bit for drilling casing in a well bore. The drill bit is constructed from a combination of relatively soft and relatively hard materials. The proportions of the materials are selected such that the drill bit provides suitable cutting and boring of the well b... | 05/15/2007 |
| 7201237 | Stabilizing system and methods for a drill bit A drill bit stabilizing system comprising a body member having an axis and at least one recess formed in the body member housing at least one stabilizing member when in a first retracted position. The stabilizing member is positionable along a diagonal angle with th... | 04/10/2007 |
| 7195736 | Lead-free steel for machine structural use with excellent machinability and low strength anisotropy A lead-free steel for machine structural use with excellent machinability and low strength anisotropy, which does not contain Pb and is equal to or higher than a conventional Pb-containing free cutting steel in properties, is provided. This steel includes, on the we... | 03/27/2007 |
| 7186173 | Tool particularly for milling operations A tool, particularly for milling operations, capable of being driven in rotation about its own main axis. The tool has a core provided with a plurality of abrasive elements extending from the core radially to the axis and spaced apart from each other angularly. Betw... | 03/06/2007 |
| 7182162 | Shirttails for reducing damaging effects of cuttings An earth-boring bit has a bit body that includes head sections, each having depending bit legs with a circumferentially extending outer surface, a leading side, and a trailing side. A bearing shaft depends inwardly from each of the bit legs for mounting a cutter. Th... | 02/27/2007 |
| 7140814 | Spade-type drill bit having helical configuration A spade bit including a longitudinally extending shaft having a cutting member located at a distal end thereof. The cutting member comprises a pair of helically shaped, opposed blades joined along the longitudinal axis of the shaft and an axially extending pilot spu... | 11/28/2006 |
| 7100712 | Method for hardfacing roller cone drill bit legs A roller cone drill bit includes a bit body adapted to be coupled to a drill string, at ne leg depending from the bit body, and a bearing journal on the at least one leg, wherein least one leg defines a shirttail portion at an end thereof. A method of manufacturing ... | 09/05/2006 |
| 7048080 | Roller cone bits with wear and fracture resistant surface Roller cone bits include a steel bit body having a leg extending therefrom. A steel cone is disposed on the leg and includes steel cutting elements projecting outwardly therefrom. One of the cutting elements comprises a steel base integral with the cone and that pro... | 05/23/2006 |
| 7044243 | High-strength/high-toughness alloy steel drill bit blank Drill bit reinforcing members or blanks of this invention are formed from high-strength steels having a carbon content less than about 0.3 percent by weight, a yield strength of at least 55,000 psi, a tensile strength of at least 80,000 psi, a toughness of at least ... | 05/16/2006 |
