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| Number | Title | Issue Date |
| 7694756 | Indenting member for a drill bit A drill bit has a bit body intermediate a working face and a shank end adapted for connection to a downhole drill string. The working face has at least three fixed blades converging towards a center of the working face and diverging towards a gauge of the bit, at le... | 04/13/2010 |
| 7360610 | Drill bit assembly for directional drilling In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion, the working portion having at least one cutting element. A shaft is supported by the body portion and extends beyond the working portion. The s... | 04/22/2008 |
| 7328755 | Hydraulic drill bit assembly In one aspect of the present invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element and the body portion has at least a portion of a jackleg apparatus. The jackleg ap... | 02/12/2008 |
| 7258179 | Rotary bit with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 08/21/2007 |
| 7225886 | Drill bit assembly with an indenting member In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has a recess with a side wall which is substantially coaxial with the shank portion. At least one cutting element is attach... | 06/05/2007 |
| 7198119 | Hydraulic drill bit assembly In one aspect of the present invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element and the body portion has at least a portion of a jackleg apparatus. The jackleg ap... | 04/03/2007 |
| 7055626 | Core bit having features for controlling flow split A core bit for cutting core samples in subterranean formations. The core bit has interior geometric features configured to control the quantity of drilling fluid, or flow split, flowing into a narrow annulus defined by an inside diameter of the core bit and an outsi... | 06/06/2006 |
| 7025144 | Wellbore liner system Wellbore apparatus has been invented which, in at least certain aspects, includes a wellbore apparatus having a tubular member with a top end, a bottom end, a hollow portion, and a window therethrough, a sleeve positioned within the hollow portion of the tubular mem... | 04/11/2006 |
| 6637521 | Earth borer An earth borer includes a thin-walled tubular shaft (4), a shank (2) provided at one end of the tubular shaft (4), and a drilling head (5) provided at another, opposite end of the tubular shaft, projecting radially beyond the tubular shaft (4), and having... | 10/28/2003 |
| 6401840 | Method of extracting and testing a core from a subterranean formation A coring apparatus permitting the taking of a non-rotating core sample and testing of same, as by NMR, prior to breakage and ejection from the apparatus. A core barrel is suspended from a rotating outer sleeve by one or more bearing assemblies which permi... | 06/11/2002 |
| 6267179 | Method and apparatus for accurate milling of windows in well casings A method and apparatus for predictable downhole milling of a casing window having predetermined location, orientation, dimension and contour geometry. An elongate substantially rigid milling shaft has at least one casing window milling element in fixed re... | 07/31/2001 |
| 6158534 | Core sampler A core sampler, particularly for oil prospecting, including a coring bit (2), an outer barrel (3) for rotating the coring bit (2), and an inner barrel (5) for receiving the core sample (7) in its internal space (8) during coring, the inner (5) and outer (... | 12/12/2000 |
| 5957221 | Downhole core sampling and testing apparatus A coring apparatus permitting the taking of a non-rotating core sample and testing of same, as by NMR, prior to breakage and ejection from the apparatus. A core barrel is suspended from a rotating outer sleeve by one or more bearing assemblies which permi... | 09/28/1999 |
| 5901797 | Drilling apparatus with dynamic cuttings removal and cleaning A drilling apparatus having cuttings removal structure to reduce balling thereof and to help prevent the accretion of portions of chips and debris from drilling thereon and/or the accretion of portions of drilling fluids thereon. The drilling apparatus co... | 05/11/1999 |
| 5791424 | Drill bit for the rotary-percussive drilling of preferably rock, concrete or the like A drill bit is proposed, in particular for the rotary-percussive drilling of preferably rock, concrete or the like, which includes a thin-walled cylindrical drilling body (106) open to the drilling side and a drill-bit base (20) extending essentially radi... | 08/11/1998 |
| 5655614 | Self-centering polycrystalline diamond cutting rock bit A self-centering drill bit includes a head portion having a plurality of polycrystalline diamond compact cutting elements arranged in blades that extend outwardly away from a surface of the bit. A cavity is centrally located on the head portion and is for... | 08/12/1997 |
| 5360260 | Tunneling machine with radially sweeping tool carriers In order to drift underground roads, tunnelling machines are used that have a rotatively driven boring head base body, a rigid first bit and rail heads that can radially sweep around axes of rotation between the working point in a conductor shaft and gall... | 11/01/1994 |
| 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 |
| 5038870 | Ice auger cutter Ice auger cutters include a shaft having a handle connected to one end for rotating the shaft about its axis, cutting elements secured to an opposite end of the shaft positioned radially outwardly from the axis, and an adjustable stop coaxially positioned... | 08/13/1991 |
| 5031708 | Cockable corebreaker apparatus Disclosed herein is a drill stem having a core bit mounted thereon and an inner tube assembly having an inner tube mounting a corebreaker case that either has or in conjunction with the inner tube provides a corebreaker recess having an upwardly facing pl... | 07/16/1991 |
| 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 |
| 4907659 | Powered soil-sampler An auger-type of device has a hollow central shaft for taking undisturbed soil samples. The tip of the device has teeth for grinding soil from around the sample. The device comprises a helical conveyor for transporting the ground product upwards and away ... | 03/13/1990 |
| 4858706 | Diamond drill bit with hemispherically shaped diamond inserts A rotary drill bit is provided which uses a plurality of hemispherically shaped diamond cutting elements, each having a cleaved, planar face. The diamonds are disposed in the bit such that the planar faces provide a plurality of knife-like cutting surface... | 08/22/1989 |
| 4854788 | Drill A drill comprising a drill shank having a taper portion adjacent to a threaded portion provided on the rear or basal portion of the shank. When the drill is screwed into an axial hole in a drill holder of a drilling machine, the opening edge or inner tape... | 08/08/1989 |
| 4825963 | High-pressure waterjet/abrasive particle-jet coring method and apparatus A simple low-cost and highly passive bitless nonrotational nondeviating jam-proof thin-kerf Newtonian hydraulics retrievable core-sampling method and apparatus that advances its circular core kerf through the rock by a combination of high-pressure droplet... | 05/02/1989 |
| 4694916 | Continuous coring drill bit A continuous coring drill bit having a body forming external lands for support of cutting elements such as industrial diamonds and grooves for conducting drilling fluid during drilling. The body further forms an internal cavity receiving a tubular core br... | 09/22/1987 |
| 4685339 | Soil sample taker and vehicle mounting arrangement A soil sampler to be mounted on a vehicle such as a pick-up truck, has a frame for mounting on the vehicle and a vertical hydraulic cylinder connected at its upper end to the frame. A sample taking probe is connected to the rod of the cylinder which drive... | 08/11/1987 |
| 4657445 | Core drill and method of removing a core therefrom Disclosed is an improved core drill and a method of detachably coupling the same to a power driving unit to expedite the removal of a core therefrom. This is achieved by equipping the rear end of the drill stem with a fixedly attached externally threaded ... | 04/14/1987 |
| 4640374 | Rotary drill bit A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in bores in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess ... | 02/03/1987 |
| 4538691 | Rotary drill bit A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess to fractu... | 09/03/1985 |
| 4535853 | Drill bit for jet assisted rotary drilling The invention relates to the geometry of drill bits for jet assisted rotary drilling. According to the invention there is used a drill bit comprising platelets of small radial dimension disposed about a central burster in a discontinuous peripheral crown ... | 08/20/1985 |
| 4534231 | Method and device for taking soil samples A process and device for extracting soil samples, wherein a core sample is extracted from the ground which is to be analyzed and part of the soil is removed from the core for subsequent analysis or other after-treatment. The core sample is removed from th... | 08/13/1985 |
| 4445580 | Deep hole rock drill bit Rock drill bit having shaving cutters on the leading end of a removable bit head for shaving the hole bottom and shaving reamer cutters extending lengthwise of the bit. The cutters and receiving slots therefor have dovetail configurations for trapping the... | 05/01/1984 |
| 4352400 | Drill bit A drill bit (10) comprises a cast body (12) with full length wide overlapping integral spiral stabilizer lands (14) between intervening spiral grooves (16), integral short, strong, stubby spiral fingers (18) reinforced by additional web portions (12a) ang... | 10/05/1982 |
| 4324300 | Rotary drill bit A drill bit including a support member and a plurality of concentrically positioned, hollow, cylindrical cutting members connected to the support member is disclosed. Each of the cutting members includes a beveled edge obliquely extending between the inne... | 04/13/1982 |
| 4280573 | Rock-breaking tool for percussive-action machines A rock-breaking tool for preferable use in self-propelled percussive machines for boring wells, comprising a casing with a pointed portion and an end face. The casing has an annular cutting edge formed by the pointed portion and inner tapered surface ther... | 07/28/1981 |
| 4258808 | Rock drill A rock drill, particularly for reinforced concrete, for rotary blow drilling, having one or several helical removal grooves for the removal of drill dust and a drill head furnished with a hard metal cutting ring is disclosed. In a preferred embodiment, th... | 03/31/1981 |
| 4244626 | Rotary cutter for gouging out ore from mine faces or the like A rotary cutter for gouging out ore from mine faces has an annular front section with a set of bits which cut a ring-shaped groove into the mine face when the cutter is rotated and moved forwardly toward and into the mine face, and a rear section which is... | 01/13/1981 |
| 4234048 | Drill bits embodying impregnated segments A diamond drill bit for drilling bore holes in earth formations having a body connectible to a drilling string, and provided with a matrix portion of hard metals in which diamonds are surface set at the outer gage portion and adjacent to the bit axis, the... | 11/18/1980 |
