| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 12/30/1997 | US5701963 Continuous injection of an inert gas through a drill rig for drilling into potentially hazardous areas |
| 12/24/1997 | WO1997048877A1 Cutter element adapted to withstand tensile stress |
| 12/24/1997 | WO1997048876A1 Rolling cone bit having gage and nestled gage cutter elements having enhancements in materials and geometry to optimize borehole corner cutting duty |
| 12/24/1997 | WO1997048874A2 Cutter element adapted to withstand tensile stress |
| 12/24/1997 | WO1997048873A2 Non-symmetrical stress-resistant rotary drill bit cutter element |
| 12/24/1997 | CN1168710A Rotary cone drill bit with angled ramps |
| 12/24/1997 | CN1168709A Rotory cone drill bit and method for enhanced lifting if fluids and cuttings |
| 12/23/1997 | US5699868 Rotary drill bits having nozzles to enhance recirculation |
| 12/23/1997 | US5699867 Bit retention device for a bit and chuck assembly of a down-the-hole, percussive drill |
| 12/18/1997 | WO1997047849A1 Cutting tool for use in a wellbore |
| 12/17/1997 | EP0599954B1 Core cutter head |
| 12/16/1997 | US5697462 Earth-boring bit having improved cutting structure |
| 12/16/1997 | US5697461 Rotary drill bit having a non-rotating gauge section |
| 12/11/1997 | WO1997046786A1 A drilling apparatus and method |
| 12/11/1997 | DE19623887A1 Drilling bit used to extract near-surface core samples, e.g. from polluting waste dumps |
| 12/10/1997 | CN2270113Y Self-sharpening type diamond drilling bit for drilling machine |
| 12/10/1997 | CN2270112Y Drilling bit |
| 12/09/1997 | US5697046 Composite cermet articles and method of making |
| 12/09/1997 | US5697042 Composite cermet articles and method of making |
| 12/09/1997 | US5695019 Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts |
| 12/09/1997 | US5695018 Earth-boring bit with negative offset and inverted gage cutting elements |
| 12/09/1997 | US5695010 Method of drilling around an existing casing pipe to regenerate an old well |
| 12/02/1997 | CA2146483C Rotary earth drill bit socket shield |
| 11/26/1997 | EP0808409A1 Cutter for a boring head |
| 11/26/1997 | EP0708872A4 Method and apparatus for controlling the head of a drilling or core-drilling device |
| 11/26/1997 | CN1165907A Bit of preventing gear wheel from dropping off |
| 11/25/1997 | US5690003 Method of forming a drill bit with debris conveying flute |
| 11/20/1997 | WO1997043515A1 Drill bit retainer for a down hole hammer assembly |
| 11/18/1997 | US5687807 Cutter head for trenchless boring machine |
| 11/18/1997 | US5687805 Back reamer apparatus |
| 11/13/1997 | DE19718573A1 Geological bore drill bit for low-angle or horizontal drilling |
| 11/12/1997 | EP0806543A1 Drilling apparatus for percussive drilling |
| 11/11/1997 | US5686119 Multiple regions, adjusting powder blend, compressive strength, isostatic pressing, net-shaped |
| 11/11/1997 | US5685769 Tool component |
| 11/11/1997 | US5685615 Eccentrically driven percussive tools for treating materials |
| 11/11/1997 | US5685382 Quadrapod auger support |
| 11/06/1997 | WO1997041332A1 Flow diverter ring for a rotary drill bit and method |
| 11/06/1997 | WO1997032110A3 Downhole core sampling and testing apparatus |
| 11/05/1997 | CN1163979A Rotary cone drill bit with contoured inserts and compacts |
| 10/30/1997 | WO1997040254A1 Rotary rock bit with infiltrated bearings |
| 10/30/1997 | WO1997030264A3 Predominantly diamond cutting structures for earth boring |
| 10/22/1997 | EP0802301A2 Earth-boring bit with super-hard cutting elements |
| 10/22/1997 | EP0670950B1 Drilling apparatus |
| 10/21/1997 | US5679445 First and second ceramic regions with variations in grain size and binder amounts; self-sharpening tools |
| 10/21/1997 | US5678645 Mechanically locked cutters and nozzles |
| 10/21/1997 | US5678644 Bi-center and bit method for enhancing stability |
| 10/16/1997 | WO1997038206A1 Reaming tool for rock drilling and a device therefor |
| 10/16/1997 | WO1997038205A1 Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty |
| 10/16/1997 | WO1997038204A1 Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty |
| 10/15/1997 | EP0801207A2 Drilling tool with marking element |
| 10/15/1997 | EP0800609A1 A drilling method and bit assembly to realize the method |
| 10/15/1997 | EP0800428A1 Composite cermet articles and method of making |
| 10/14/1997 | US5677042 Tips for excavation, mining; wear resistance |
| 10/14/1997 | US5676501 Drill bit tube |
| 10/14/1997 | US5676214 Flow channels for tooth type rolling cutter drill bits |
| 10/14/1997 | CA2029927C Drill assembly |
| 10/09/1997 | CA2185718A1 Multi-purpose drilling tool |
| 10/08/1997 | EP0799966A2 Drill bit for percussive drilling |
| 10/08/1997 | EP0799103A1 Composite cermet articles and method of making |
| 10/02/1997 | WO1997036086A1 Thrust disc bearings for rotary cone air bits |
| 10/02/1997 | WO1997035682A1 Twist drill with asymmetrically spaced support margins |
| 10/02/1997 | DE19608815C1 Device for producing sealing floor in ground, used in construction |
| 10/01/1997 | CN1036019C Drilling apparatus |
| 09/30/1997 | US5671818 Rotary drill bits |
| 09/30/1997 | US5671817 Drill bit with dual reaming rows |
| 09/30/1997 | US5671816 Swivel/tilting bit crown for earth-boring drills |
| 09/30/1997 | CA2022495C Nozzle means for rotary drill bits |
| 09/25/1997 | WO1997035091A1 Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces |
| 09/24/1997 | EP0796385A1 Rotary cone drill bit with angled ramps |
| 09/24/1997 | EP0676001A4 Drill bit having chip breaker polycrystalline diamond compact and hard metal insert at gauge surface. |
| 09/24/1997 | CN2263194Y Roller bit with inside strength tooth |
| 09/24/1997 | CN2263193Y Drilling bit with expanding cutting tool |
| 09/24/1997 | CN1160431A Concave cutter bit |
| 09/23/1997 | US5669459 Nozzle retention system for rock bits |
| 09/23/1997 | US5669271 Elements faced with superhard material |
| 09/23/1997 | CA2045094C Low friction subterranean drill bit and related methods |
| 09/18/1997 | WO1997034072A1 Rock drill bit and a rock drilling tool |
| 09/18/1997 | WO1997034071A1 Cantilevered hole opener |
| 09/17/1997 | EP0795677A2 Drilling tool |
| 09/17/1997 | EP0795073A1 Rotary cone drill bit and method for enhanced lifting of fluids and cuttings |
| 09/17/1997 | CN1159847A Rock drill bit and cutting inserts |
| 09/17/1997 | CN1159846A Rock drill bit and cutting inserts |
| 09/17/1997 | CN1159505A High-speed impact drill |
| 09/17/1997 | CN1159383A Rotary impact type twist drill |
| 09/17/1997 | CN1159382A Rotary impact type twist drill |
| 09/17/1997 | CN1035892C Drill bit with improved insert cutter pattern |
| 09/16/1997 | US5668092 Blend of addition polymers, metal-free additives, extreme pressure applications, drilling subterranean wells, lubriants for journal bearings |
| 09/16/1997 | US5667903 Method of hard facing a substrate, and weld rod used in hard facing a substrate |
| 09/16/1997 | US5667028 Multiple diamond layer polycrystalline diamond composite cutters |
| 09/16/1997 | US5666864 Earth boring drill bit with shell supporting an external drilling surface |
| 09/12/1997 | WO1997033065A1 Directional boring |
| 09/12/1997 | CA2248024A1 Directional boring |
| 09/10/1997 | EP0794314A1 An improved abrasive cutting element and drill bit |
| 09/10/1997 | CN2262096Y Multiple adaptive bottom enlarging drill bit |
| 09/04/1997 | WO1997032110A2 Downhole core sampling and testing apparatus |
| 09/04/1997 | WO1997032108A1 A drilling apparatus |
| 09/02/1997 | US5663512 Hardfacing composition for earth-boring bits |
| 09/02/1997 | US5662720 Cutters for drilling rocks using metal carbide substrates |
| 09/02/1997 | US5662183 High strength matrix material for PDC drag bits |
| 09/02/1997 | US5662182 System for in situ replacement of cutting means for a ground drill |