Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7419016 | Bi-center drill bit In one aspect of the present invention a drill bit assembly comprises a working portion opposite a shank of the bit. The working portion has a plurality of cutting elements. The drill bit assembly also has a central axis eccentric to its axis of rotation. A jack ele... | 09/02/2008 |
| 7401668 | Single cone rock bit having inserts adapted to maintain hole gage during drilling A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string. A bearing journal depends from the bit body. A single roller cone is rotatably attached to the bearing journal. The roller cone has a plurality of inserts dispose... | 07/22/2008 |
| 7299887 | Roller bit with a journal pin offset from the central axis thereof This invention relates to a single cone bit with offset axis and composite cones for oil and gas drilling, mining and other subterranean drilling operations. The bit consists of a head body and a cone. The cone section has a shape of composite cones. The outer circu... | 11/27/2007 |
| 7270503 | Cutting tool for rotating and drilling into solid blocks The invention relates to a cutting tool for rotating and drilling into solid blocks, comprising a drill shank (1) and a cutting head (2) on one end. The cutting head (2) has a straight, front-face cutting edge (4) extending approximately ... | 09/18/2007 |
| 7100711 | Single cone rock bit having inserts adapted to maintain hole gage during drilling A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string. A bearing journal depends from the bit body. A single roller cone is rotatably attached to the bearing journal. The roller cone has a plurality of inserts dispose... | 09/05/2006 |
| 7000715 | Rotary drill bits exhibiting cutting element placement for optimizing bit torque and cutter life A superabrasive cutter-equipped rotary drag bit especially suitable for directional drilling in subterranean formations is provided. The bit may employ PDC cutters in an engineered cutter placement profile exhibiting optimal aggressiveness in relation to where the c... | 02/21/2006 |
| 6926099 | Drill out bi-center bit and method for using same A drill out bi-center bit and a method for using the same are provided that offer the ability to drill out cement and casing shoes, and increased stability. The bi-center bit includes a bit body having a first end operable to be coupled with a drill string, a second... | 08/09/2005 |
| 6920944 | Apparatus and method for drilling and reaming a borehole A drilling assembly and an eccentric, adjustable diameter reamer are disclosed. The reamer includes cutter elements mounted on at least a first fixed blade for reaming a previously-formed borehole or for forming a borehole of increased diameter beneath an existing c... | 07/26/2005 |
| 6913098 | Sub-reamer for bi-center type tools An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force... | 07/05/2005 |
| 6827159 | Steerable horizontal subterranean drill bit having an offset drilling fluid seal Various steerable horizontal subterranean drill bit apparatuses, which may have a drill bit, a housing and a one-bolt attachment system, or other features. ... | 12/07/2004 |
| 6814168 | Steerable horizontal subterranean drill bit having elevated wear protector receptacles A steerable horizontal subterranean drill bit apparatus is disclosed. The apparatus may include a drill bit and a housing. The drill bit may include elevated wear protector receptacles in particular locations and configurations. ... | 11/09/2004 |
| 6810971 | Steerable horizontal subterranean drill bit Various steerable horizontal subterranean drill bit apparatuses, which may have a drill bit, a housing and a one-bolt attachment system, or other features. ... | 11/02/2004 |
| 6810972 | Steerable horizontal subterranean drill bit having a one bolt attachment system Various steerable horizontal subterranean drill bit apparatuses, which may have a drill bit, a housing and a one-bolt attachment system, or other features. ... | 11/02/2004 |
| 6810973 | Steerable horizontal subterranean drill bit having offset cutting tooth paths Various steerable horizontal subterranean drill bit apparatuses, which may have a drill bit, a housing and a one-bolt attachment system, or other features. ... | 11/02/2004 |
| 6739416 | Enhanced offset stabilization for eccentric reamers Enhanced stabilization is provided for an eccentric reaming tool when a pilot borehole is undersized with respect to a following pilot stabilization pad (PSP). Alternatively, offset of a rotational axis of at least a portion of the assembly including the reaming too... | 05/25/2004 |
| 6659207 | Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability A bi-center drill bit is disclosed which includes a bit body having pilot blades and reaming blades distributed azimuthally around the body. The blades have cutting elements disposed thereon at selected positions. The body and blades define a longitudinal... | 12/09/2003 |
| 6602028 | Support pad for a deep hole drill An element which defines a support pad and/or a guide bar adapted to be mounted in a seat of a cutter head of a deep hole drill comprises a body which defines a longitudinal direction and a cross-direction. The body includes an inner mounting side and an ... | 08/05/2003 |
| 6464024 | Bi-centered drill bit having improved drilling stability, mud hydraulics and resistance to cutter damage A bi-center drill bit includes pilot and reaming blades affixed to a body at azimuthally spaced locations. The blades have PDC cutters attached at selected positions. In one aspect, the pilot blades form a section having length along the bit axis less tha... | 10/15/2002 |
| 6394200 | Drillout bi-center bit The present invention is a bi-center drill bit designed to drill out the cement and other material in the casing and then proceed to drill out the full gauge drilling diameter borehole with a diameter greater than the inside of the casing. The bi-center d... | 05/28/2002 |
| 6321858 | Bit for directional drilling An improved drill bit for directional drilling includes a housing or headpiece having means at a rear end thereof for mounting the bit on a trailing component of a drill head, and passages for ejection of drilling fluid into a borehole. A first axle is mo... | 11/27/2001 |
| 6308789 | Drill bit for directional drilling A drill bit that is arranged to change the direction of drilling. A cone head is rotatably mounted on a shank portion extending from an elongate housing. When the housing is rotated, the cone head generates a concave hole. When a change in direction is re... | 10/30/2001 |
| 6298929 | Bi-center bit assembly An improved bi-center drill bit and drill bit assembly includes a cylindrical body having a first diameter section and a smaller second diameter section, each section provided with a threaded end. The cylindrical body includes a longitudinal internal chan... | 10/09/2001 |
| 6269893 | Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage A bi-center drill bit includes pilot and reaming blades affixed to a body at azimuthally spaced locations. The blades have PDC cutters attached at selected positions. In one aspect, the pilot blades form a section having length along the bit axis less tha... | 08/07/2001 |
| 6213231 | Boring tool with rectangular plates A boring tool is provided with first and second rectangular reversing cut plates which have, in each case, two short and two considerably longer cutting edges. One of the reversing cut plates is arranged connecting to or intersecting the axis of rotation ... | 04/10/2001 |
| 6209660 | Drill bit shear relief for horizontal directional drilling of rock formations A drill bit for directional boring of all earth formations such as dirt, sand, rock and/or any type combination of formations, utilizing a bit body containing fixed and semi-floating cutting points and one or more fluid channels for the purpose of lubrica... | 04/03/2001 |
| 6206117 | Drilling structure with non-axial gage A drill bit and method of drilling a subterranean formation are disclosed in which the drill bit is configured with a non-axial gage portion of a bit body. The non-axial gage portion of the bit body presents a peripheral profile which is not parallel to t... | 03/27/2001 |
| 6202768 | Rock drilling tool and reamer for percussive drilling A rock drilling tool includes a pilot bit screw threaded into a front end of a drill rod. A reamer is mounted on the outside of the pilot bit. The reamer includes a central opening having a front portion and a rear portion. The front portion is connected ... | 03/20/2001 |
| 6161636 | Boring head and bit protective collar A protective collar for a 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 mounting bolts. A collar is ... | 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 |
| 6089336 | Rotary drill bits A rotary drill bit for use in drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as to de... | 07/18/2000 |
| 5992548 | Bi-center bit with oppositely disposed cutting surfaces An improved bi-center bit with improved directional stability and wear resistance is disclosed, which bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce... | 11/30/1999 |
| 5979576 | Anti-whirl drill bit An anti-whirl rotary drag bit including one or more cutters, wear knots or other support structures disposed on the flank of a bit profile in a normally cutter-devoid region of the profile adjacent the gage of the bit in the circumferential segment of the... | 11/09/1999 |
| 5967246 | Rotary drill bits A rotary drill bit for use in drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as to de... | 10/19/1999 |
| 5957223 | Bi-center drill bit with enhanced stabilizing features A method and apparatus for reaming or enlarging a borehole using a bi-center bit with a stability-enhanced design. The cutters on the pilot bit section of the bi-center bit are placed and oriented to generate a lateral force vector longitudinally offset f... | 09/28/1999 |
| 5873422 | Anti-whirl drill bit An anti-whirl rotary drag bit including one or more cutters, wear knots or other support structures disposed on the flank of a bit profile in a normally cutter-devoid region of the profile adjacent the gage of the bit in the circumferential segment of the... | 02/23/1999 |
| 5820316 | Guide element for a cutting tool Guide element for a cutting tool having a location hole (20) in the tool shank (4) having an internal thread (16, 10), which has a threaded bolt (14) having an external thread that can be screwed into the internal thread (16, 10) and is spring mounted in ... | 10/13/1998 |
| 5819860 | Rotary drill bits A rotary drill bit for use in drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as to de... | 10/13/1998 |
| 5402856 | Anti-whirl underreamer An anti-whirl underreamer comprising a body configured for connection to a drillstring, at least two arms carried by the body which are extendable between a retracted position and a projected position, a movable piston and biased spring assembly for movin... | 04/04/1995 |
| 5328304 | Reamer A reamer includes a cutting tip mounted in the circumferential wall of the base body of the cutting head of the reamer, and at least one guide bead located in a groove formed in the base body and extending in the longitudinal direction of the base body. T... | 07/12/1994 |
| 5199511 | Drill bit and method for reducing formation fluid invasion and for improved drilling in plastic formations A drill bit and method in which polycrystalline diamond cutters mounted on a bit crown cut formation chips akin to the manner in which a grater cuts cheese. Chips in impermeable or plastic formations are extruded by the cutters into cavities internal to t... | 04/06/1993 |
