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| Number | Title | Issue Date |
| 7926597 | Fixed cutter bit and blade for a fixed cutter bit and methods for making the same A blade, which is useful on a tool that impinges earth strata, that has a blade body with a leading surface. The blade body has a first portion defining at least a part of the leading surface and a second portion. The first portion is made of a first material compos... | 04/19/2011 |
| 7909121 | Polycrystalline ultra-hard compact constructions Polycrystalline ultra-hard compact constructions comprise a polycrystalline ultra-hard compact having a polycrystalline ultra-hard body attached to a substrate. A support member is attached to the compact by a braze material. The support member can have a one-piece ... | 03/22/2011 |
| 7757793 | Thermally stable polycrystalline ultra-hard constructions Thermally stable polycrystalline constructions comprise a body having a polycrystalline ultra-hard phase and a plurality of empty voids. A population of the voids can be filled with a reaction product. The body is substantially free of a catalyst material. The const... | 07/20/2010 |
| 7434635 | Tin seat for rock drill insert A rock drilling bit includes at least one button having a button sidewall and button bottom, the button sidewall and the button bottom having a button sidewall geometry and a button bottom geometry, respectively. The rock drilling bit further comprises a bit body ha... | 10/14/2008 |
| 7392865 | Randomly-oriented composite constructions Composite constructions comprise a plurality of granules that are arranged together in a randomly-oriented manner. The granules each comprise an ordered arrangement of a first material phase and a second material phase, wherein the first and second material phases a... | 07/01/2008 |
| 7389834 | Braze alloys An improved braze alloy is microalloyed to include about 0.0005 wt % to about 0.5 wt % of at least one aggressively surface acting element selected from tellurium (Te), selenium (Se), antimony (Sb), bismuth (Bi), and gallium (Ga), or any combination thereof. The bra... | 06/24/2008 |
| 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 |
| 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 |
| 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 |
| 7243744 | Randomly-oriented composite constructions Composite constructions comprise a plurality of granules that are arranged together in a randomly-oriented manner. The granules each comprise an ordered arrangement of a first material phase and a second material phase, wherein the first and second material phases a... | 07/17/2007 |
| 6959775 | Drill bit A drill comprising a shank part (11), which is adapted to be received in a drill holder of a drilling machine, and an opposite cutting end part (13). An intermediate fluted part (12) is provided, which defines at least one helical flute or chann... | 11/01/2005 |
| 6945340 | Roof bit and insert assembly A center vacuum rotary drill bit including a rotary drill bit body and an insert. The bottom surface of the slot has a projecting key that cooperates with a depression keyway of the insert. Generally vertical sidewall surfaces of a depression keyway and vertical sur... | 09/20/2005 |
| 6926104 | Drill crown A drill crown (1) used for drilling purposes, especially for rotary percussion drilling of a mouth of a blast furnace. The drill crown (1) consists of a drilling head (4) provided with a plurality of hard material or hard metal inserts (6... | 08/09/2005 |
| 6843333 | Impregnated rotary drag bit A drill bit employing a plurality of discrete, post-like, abrasive, particulate-impregnated cutting structures extending upwardly from abrasive, particulate-impregnated blades defining a plurality of fluid passages therebetween on the bit face. Additional cutting el... | 01/18/2005 |
| 6782958 | Hardfacing for milled tooth drill bits In one embodiment, a hardfacing composition for a drill bit, including a carbide phase including from about 50% to about 80% by weight of the hardfacing composition of a combination of 80 to 200 mesh macro-crystalline tungsten carbide and 80 to 200 mesh crushed cast... | 08/31/2004 |
| 6772849 | Protective overlay coating for PDC drill bits In one embodiment, a method of increasing a durability of a drill bit having a bit body with at least one blade disposed thereon, at least one cutter pocket disposed on the blade, and at least one cutter disposed in the cutter pocket is disclosed. The method include... | 08/10/2004 |
| 6725953 | Drill bit having diamond impregnated inserts primary cutting structure An earth-boring bit comprises a bit body bit body in which are mounted a plurality of cutting structures inserts, wherein at least a portion of the cutting structures comprise diamond-impregnated inserts having a total thermal exposure of less than 25 minutes above ... | 04/27/2004 |
| 6702047 | Drill bit for drilling rock The drill bit is particularly suitable for drilling rock. An elongated shank carries at least one cutting insert at one end. Cutting edges are formed by adjoining flanks and rake faces which enclose a wedge angle γ. The rake faces, between marginal segme... | 03/09/2004 |
| 6658968 | Percussive rock drill bit and buttons therefor and method for manufacturing drill bit A percussive rock drill bit includes a head portion with a forward surface surrounded by a peripheral surface. The peripheral surface supports a wreath of peripheral buttons. Front buttons are mounted to the forward surface inside the wreath of peripheral... | 12/09/2003 |
| 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 |
| 6564884 | Wear protection on a rock bit Using inserts which are welded in place allows the use of hardfacing in the immediate vicinity of the inserts. Areas of high wear, such as cutting structures and gage areas, can use a combination of ultra-hard inserts with hardfacing for protection agains... | 05/20/2003 |
| 6554369 | Cutting tool with hardened insert A cutting tool has a tool body with a hardened insert brazed into a cylindrical seat having a given diameter at the forward end of the tool body. The insert has a cutting tip portion, a generally cylindrical base portion positioned behind the tip, and a f... | 04/29/2003 |
| 6394202 | Drill bit having diamond impregnated inserts primary cutting structure An earth-boring bit comprises a bit body bit body in which are mounted a plurality of cutting structures inserts, wherein at least a portion of the cutting structures comprise diamond-impregnated inserts having a total thermal exposure of less than 25 min... | 05/28/2002 |
| 6138780 | Drag bit with steel shank and tandem gage pads A rotary earth-boring drag bit assembly has a bit body formed of a carbide matrix material. The body has a longitudinal axis and a face on a lower end containing cutters for engaging and cutting a bottom of the borehole. The cutters are carried on fixed b... | 10/31/2000 |
| 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 |
| 6116360 | Methods of manufacturing rotary drill bits A rotary drill bit is manufactured by a method including the step of forming at least a portion of the bit body from a precipitation hardening alloy, and brazing cutters to the bit body by a heating and cooling cycle during which the bit body is first hea... | 09/12/2000 |
| 6098729 | Preform cutting elements for rotary drill bits A preform cutting element, for a rotary drag-type drill bit, includes a facing table of superhard material having a front face, a peripheral surface, and a rear surface bonded to the front surface of a substrate which is less hard than the superhard mater... | 08/08/2000 |
| 5853054 | 2-Stage underreamer A 2-stage underreamer for use in a subterranean wellbore includes a unitary body having upper and lower blades mounted in slots formed perpendicular to each other in the body. Separate upper and lower piston assemblies are provided for driving the blades ... | 12/29/1998 |
| 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 |
| 5755298 | Hardfacing with coated diamond particles Hardfacing to protect wear surfaces of drill bits and other downhole tools having coated diamond particles dispersed within and bonded to a metallic matrix deposit. The coating on the diamond particles may be formed from materials and alloys such as parti... | 05/26/1998 |
| 5735648 | Tool bit with carrier member and cutting member A tool bit for use in at least one of a drilling and cutting operation is formed of an axially extending carrier member (1) and a cutting member (2). The cutting member (2) has an expansion joint (2a) extending parallel to the axis of the carrier member (... | 04/07/1998 |
| 5630478 | Masonry drill bit and method of making a masonry drill bit A masonry drill and method of manufacture is disclosed. The drill has an elongated axial body with at least one discharge groove and a transverse slot located at one end with a hardened drill bit insert brazed within the slot. The hardened insert has proj... | 05/20/1997 |
| 5549171 | Drill bit with performance-improving cutting structure A fixed cutter drill bit includes sets of cutter elements mounted on the bit face. Each set includes at least two cutters mounted on different blades at generally the same radial position with reset to the bit axis but having differing degrees of backrake... | 08/27/1996 |
| 5373908 | Chamfered cutting structure for downhole drilling A cutting structure for use in a rotary drag bit for downhole drilling is disclosed which relieves stress concentrations focused in the cutting structure along a line adjacent the surface where a cutting element abuts the carrier element or stud. A semici... | 12/20/1994 |
| 5251964 | Cutting bit mount having carbide inserts and method for mounting the same The forward surface of a bit mount against which the shoulder of a cutting bit can rotatably bear has carbide inserts brazed therein to reduce wear of the forward surface. In the manufacture thereof, there are insert holes in the forward surface into whic... | 10/12/1993 |
| 5238075 | Drill bit with improved cutter sizing pattern A fixed cutter drill bit includes a plurality of angularly spaced radial wings each with a row of cutting elements mounted thereon and protruding from the bit for drilling through formation material. On a first of the wings, a first row of the cutting ele... | 08/24/1993 |
| 5224560 | Modular drill bit A modular drill bit mounts legs within recesses in a body which are parallel to the central axis of the body using threaded studs with tapered outer portions, in conjunction with an attached pin having recesses therein receiving the upper ends of the legs... | 07/06/1993 |
| 5172780 | Hard metal or hard material tipped drilling, chipping and cutting tools Precipitation hardenable solders are used for securing hard metal or hard material parts to the support member of a tool for drilling, chipping or cutting rock or hard construction materials. The support member is formed of steel. The hard metal or hard m... | 12/22/1992 |
| 5141289 | Cemented carbide tip A cemented carbide tip for a cutter bit is provided. The tip is rotationally symmetric about its longitudinal axis and has a socket in its rear end for brazine to a steel protrusion on a steel tool shank. A surface of the socket has bumps thereon to maint... | 08/25/1992 |
| 5060739 | Cutter assemblies for rotary drill bits, and method of manufacturing same A cutter assembly, for a rotary drill bit, comprises a stud to be received in a socket in the surface of the bit body, the stud being formed, adjacent one end, with a plane surface inclined to the longitudinal axis of the stud. A preform cutting element c... | 10/29/1991 |
