| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 05/26/1999 | EP0918134A1 Polycrystalline diamond compact cutter with reduced failure during brazing |
| 05/25/1999 | US5906246 PDC cutter element having improved substrate configuration |
| 05/25/1999 | US5906245 For attachment of a component to an earth boring drill bit |
| 05/19/1999 | EP0916804A1 Polycrystalline diamond cutting element |
| 05/19/1999 | EP0916803A2 Rotary drill bit for casing milling and formation drilling |
| 05/19/1999 | EP0916771A2 Milling tooth for the working of the soil |
| 05/19/1999 | EP0916014A1 Apparatus and method for milling a hole in casing |
| 05/19/1999 | CN2319562Y Thin wall bit of electroplated diamond |
| 05/18/1999 | US5904939 Extruder for extrusion manufacturing |
| 05/18/1999 | US5904447 Drive device used for soil stabilization |
| 05/18/1999 | US5904213 For connection to a drill string and drilling boreholes in subsurfaces |
| 05/18/1999 | US5904212 Gauge face inlay for bit hardfacing |
| 05/18/1999 | US5904211 Disc cutter and excavation equipment |
| 05/14/1999 | WO1999023345A2 Mill for use in a wellbore and method of milling |
| 05/12/1999 | EP0915231A1 Spiral-shaped roller cutter and tunnel excavator cutter head provided with same |
| 05/12/1999 | DE19749409A1 Special drilling process and corresponding drill head |
| 05/12/1999 | DE19748987A1 Rotary-percussive stone drill for breakthrough work |
| 05/12/1999 | CN2318387Y Anti-confining-pressure jet cutting spray nozzle |
| 05/12/1999 | CN2318386Y Runner and teeth distributed of anti-drop tri-cone rotary drill bit |
| 05/12/1999 | CN2318385Y Mixed rock drilling blade |
| 05/12/1999 | CN2318384Y Ridge whole-gage drag bit |
| 05/11/1999 | US5901797 Drilling apparatus with dynamic cuttings removal and cleaning |
| 05/06/1999 | WO1999022110A1 Pre-orienting nozzle assembly |
| 05/06/1999 | EP0912814A1 Improved disc cutter and excavation equipment |
| 05/05/1999 | CN2317305Y Reducing borehole-enlarging drilling tool |
| 05/04/1999 | US5899283 Drill bit for horizontal directional drilling of rock formations |
| 05/04/1999 | US5899268 Downhole milling tool |
| 04/28/1999 | EP0694113A4 Integrated drilling and rock bolting apparatus |
| 04/28/1999 | CN2316450Y Gravel drill bit |
| 04/27/1999 | US5896940 Underreamer |
| 04/22/1999 | WO1999019597A1 Rock bit with improved nozzle placement |
| 04/22/1999 | WO1999019596A2 Directional drilling tool |
| 04/22/1999 | WO1999019117A2 Roof bolt bit |
| 04/22/1999 | DE19854610A1 Bore head for bore machine |
| 04/22/1999 | DE19827058A1 Cutter head for tunneling machines in civil constructions |
| 04/22/1999 | CA2306944A1 Directional drilling tool |
| 04/21/1999 | EP0909869A2 Hardmetal overlay for earth boring bit |
| 04/21/1999 | EP0909362A1 Boring tool for reverse circulation |
| 04/21/1999 | CN2315288Y Gear wheel drill rig for conveniently mounting rotary member into bearing cavity |
| 04/21/1999 | CN2315287Y Drilling rig of well drilling machine on gravel layer |
| 04/20/1999 | US5895179 Drill |
| 04/15/1999 | WO1999018326A1 Small disc cutters, and drill bits, cutterheads, and tunnel boring machines employing such rolling disc cutters |
| 04/15/1999 | WO1999018325A1 Rock or earth penetrating devices and methods |
| 04/14/1999 | EP0908601A1 A cutting tool insert |
| 04/14/1999 | CN2314085Y Screw connected tranversing drill without connecting rod |
| 04/14/1999 | CN1214102A Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces |
| 04/14/1999 | CN1214101A Directional boring |
| 04/14/1999 | CN1042909C Spiral anchor with deoperable screw |
| 04/13/1999 | US5893204 Production process for casting steel-bodied bits |
| 04/08/1999 | WO1999010621B1 Cutting insert and milling tool for use in a wellbore |
| 04/08/1999 | WO1999004128A3 Rotatable cutting bit assembly with cutting inserts |
| 04/07/1999 | EP0906488A1 Cutting tool for use in a wellbore |
| 04/06/1999 | US5891830 Hot, subterranean |
| 04/06/1999 | US5890552 Superabrasive-tipped inserts for earth-boring drill bits |
| 04/06/1999 | US5890551 Rock drilling tool including a drill bit having a recess in a front surface thereof |
| 04/06/1999 | US5890550 Earth-boring bit with wear-resistant material |
| 03/31/1999 | EP0905348A2 Underreamer blade |
| 03/31/1999 | EP0905347A2 Device and method for enlarging a bore |
| 03/30/1999 | US5888619 Elements faced with superhard material |
| 03/30/1999 | US5887668 Wellbore milling-- drilling |
| 03/30/1999 | US5887655 Wellbore milling and drilling |
| 03/30/1999 | US5887580 Cutting element with interlocking feature |
| 03/30/1999 | CA2051221C Method of manufacturing a bimetal casting and wearing part produced by this method |
| 03/24/1999 | EP0728050A4 Method and system of trajectory prediction and control using pdc bits |
| 03/18/1999 | WO1999013194A1 Gage pad arrangements for rotary drill bits |
| 03/18/1999 | DE19740277A1 Boring tool for rotary striking boring of stone or concrete |
| 03/17/1999 | EP0902159A2 Cutting element with a non-planar, non-linear interface |
| 03/17/1999 | CN2310856Y Rotary double rope elevating percussion bit |
| 03/17/1999 | CN1211205A Method for making a carbide cutting insert |
| 03/16/1999 | US5881830 Superabrasive drill bit cutting element with buttress-supported planar chamfer |
| 03/16/1999 | US5881829 Rolling-cutter mining bit with relatively soft formation cutting structure |
| 03/16/1999 | US5881828 Rock drill bit and cutting inserts |
| 03/16/1999 | US5881827 Extendable bit |
| 03/11/1999 | WO1999011900A1 Drill bit |
| 03/11/1999 | CA2300158A1 Drill bit |
| 03/10/1999 | CN2310147Y Diamond bit |
| 03/09/1999 | US5880382 Containing tungsten, titanium, molybdenum, niobium, vanadium, hafnium, tantalum, chromium; wear resistance, fracture toughness; drill bits |
| 03/09/1999 | US5878634 Earth boring drill bit with shell supporting an external drilling surface |
| 03/04/1999 | WO1999010621A1 Cutting insert and milling tool for use in a wellbore |
| 03/04/1999 | WO1999010552A1 A ROTARY EARTH STRATA PENETRATING TOOL WITH A CERMET INSERT HAVING A Co-Ni-Fe-BINDER |
| 03/04/1999 | DE19738171A1 Boring machine with driving slide on guide column |
| 03/04/1999 | CA2302305A1 A rotary earth strata penetrating tool with a cermet insert having a co-ni-fe-binder |
| 03/04/1999 | CA2246511A1 Cutter element with non-rectilinear crest |
| 03/04/1999 | CA2246466A1 Cutter element with expanded crest geometry |
| 03/03/1999 | EP0899044A1 Method of making a drill blank |
| 03/03/1999 | CN2309416Y 砾石钻头 Gravel drill |
| 03/03/1999 | CN1209858A Method for forming window in tubular and apparatus for use in said method |
| 03/02/1999 | US5876845 Diamond |
| 03/02/1999 | US5875862 Polycrystalline diamond cutter with integral carbide/diamond transition layer |
| 03/02/1999 | US5875861 Different stiffness energizers for MF seals |
| 03/02/1999 | US5875860 Drill for making a pole in the ground and a method for applying such a drill |
| 03/02/1999 | US5875858 Low volume air-water drilling systems and methods |
| 02/25/1999 | WO1999009293A1 Diamond-coated button insert for drilling and percussive rock drill |
| 02/25/1999 | WO1999009292A1 Partially enhanced drill bit |
| 02/24/1999 | EP0898045A2 Cutting structure for rotary drill bit with conduits for drilling fluid |
| 02/24/1999 | EP0898044A2 Rotary drag-type drill bit with drilling fluid nozzles |
| 02/24/1999 | EP0846217A4 Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts |
| 02/24/1999 | CN1042252C Imbalance compensation drill bit |
| 02/23/1999 | US5873422 For drilling subterranean formations |
| 02/23/1999 | US5873419 Ice auger attachment |