| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 04/11/2002 | US20020040813 Twist drill bit for rock drilling |
| 04/11/2002 | US20020040798 Breaking apparatus and tool |
| 04/11/2002 | DE10047332A1 Werkzeug mit Wendel Tool with spiral |
| 04/10/2002 | EP1195229A1 Breaking apparatus and tool |
| 04/09/2002 | US6368377 Tungsten carbide nickel-chromium alloy hard member and tools using the same |
| 04/09/2002 | US6367569 Replaceable multiple TCI kerf ring |
| 04/09/2002 | US6367568 Steel tooth cutter element with expanded crest |
| 04/03/2002 | EP1007818B1 Rock drill bit |
| 03/28/2002 | WO2002025054A1 Quick release drill bit for down-hole drills |
| 03/28/2002 | WO2002024603A1 Polycrystalline diamond with a surface depleted of catalyzing material |
| 03/28/2002 | WO2002024601A1 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material |
| 03/28/2002 | US20020037200 Shaped cutting-grade inserts with transitionless diamond-enhanced surface layer |
| 03/28/2002 | CA2632860A1 Formation cutting method and system |
| 03/28/2002 | CA2423099A1 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material |
| 03/27/2002 | EP1191001A2 Rotary drill bit design method |
| 03/27/2002 | EP1191000A2 Rotary drill bit |
| 03/27/2002 | EP1190999A2 Machining of polycrystalline diamond |
| 03/27/2002 | EP1190797A1 Drilling tool |
| 03/27/2002 | EP1190791A2 Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength |
| 03/27/2002 | CN1081715C Drill means |
| 03/26/2002 | US6361873 Composite constructions having ordered microstructures |
| 03/26/2002 | US6360832 Hardfacing with multiple grade layers |
| 03/26/2002 | US6360831 Borehole opener |
| 03/26/2002 | CA2096300C O-ring seal for rock bit bearings |
| 03/21/2002 | WO2001065048A3 Rock drill |
| 03/21/2002 | US20020034632 Polycrystalline diamond partially depleted of catalyzing material |
| 03/21/2002 | US20020034631 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material |
| 03/21/2002 | US20020033383 Machining of polycrystalline diamond |
| 03/21/2002 | US20020033282 Rotary drill bit |
| 03/21/2002 | US20020033077 Rotary drill bit design method |
| 03/20/2002 | EP1188898A2 Improvements in or relating to preform cutting elements for rotary drill bits |
| 03/20/2002 | EP1188897A1 Rock drill bit |
| 03/20/2002 | EP1047857B1 Rock drilling tool |
| 03/20/2002 | EP0843772B1 Cutting tool for drilling concrete, aggregate or masonry |
| 03/20/2002 | EP0784734B1 A rock drill bit and cutting inserts |
| 03/20/2002 | CN1081281C Drill bit |
| 03/20/2002 | CN1081280C Drilling tool with support and cutting head |
| 03/20/2002 | CN1081117C Rotary impact type twist drill |
| 03/19/2002 | US6357540 Rotary drill bit with lip seal in roller cone bit |
| 03/14/2002 | WO2002020936A2 Drill bit |
| 03/14/2002 | US20020029909 Rotary cone bit with functionally-engineered composite inserts |
| 03/14/2002 | DE10043428A1 Gesteinsbohrer Rock drill |
| 03/14/2002 | DE10043417A1 Gesteinsbohrer Rock drill |
| 03/14/2002 | CA2421288A1 Drill bit |
| 03/13/2002 | EP0909362B1 Boring tool for reverse circulation |
| 03/12/2002 | US6354771 Cutting or breaking tool as well as cutting insert for the latter |
| 03/12/2002 | US6354740 Rolling cutter drill bits |
| 03/12/2002 | US6354387 Nozzle orientation for roller cone rock bit |
| 03/12/2002 | US6354362 Method and apparatus for infiltrating preformed components and component assemblies |
| 03/07/2002 | US20020027326 Roller cone bit with improved seal gland design |
| 03/07/2002 | US20020027024 Rock drill |
| 03/07/2002 | DE10132753A1 Horizontal direction drilling machine, uses planetary gear mechanism to keep excavator head rotation speed lower than drive shaft rotation speed |
| 03/07/2002 | DE10041911A1 Diamantbohrkrone Diamond core bit |
| 03/06/2002 | EP1184535A2 Rock drill |
| 03/06/2002 | EP1184115A1 Rock drill |
| 03/06/2002 | CN2480537Y Drill bit with drop-proof prewarning function |
| 03/06/2002 | CN2480536Y Drill for hard stratum |
| 03/06/2002 | CN2480535Y Multi-edge drill |
| 03/06/2002 | CN1080361C Directional boring method and apparatus |
| 03/05/2002 | US6353771 Rapid manufacturing of molds for forming drill bits |
| 02/28/2002 | WO2002016725A1 Method of mounting a tsp |
| 02/28/2002 | US20020023783 Failure indicator for rolling cutter drill bit |
| 02/28/2002 | US20020023635 Method of forming a base body for a diamond bit |
| 02/28/2002 | DE10040261A1 Multi-channel deep drilling system has roller bits in two opposed channels in working positions, bit in waiting position in one channel; new bit can be inserted into channel during drilling |
| 02/27/2002 | EP1182326A2 Indicator for bearing failure of rolling cutter drill bit |
| 02/27/2002 | EP1182325A1 Cutting elements for rotary drill bits |
| 02/27/2002 | EP1182324A2 Diamond drill bit |
| 02/27/2002 | EP1182323A1 Multi-directional cutters for bi-center drillout bits |
| 02/27/2002 | CN2479184Y Drill bit with one spiral blade for petroleum geologic prospecting |
| 02/27/2002 | CN2479183Y Comb-type three-blade drill bit for petroleum geologic prospecting |
| 02/27/2002 | CN2479182Y Drill bit with four spiral blades for petroleum geologic prospecting |
| 02/27/2002 | CN2479181Y Roller bit for petroleum geologic prospecting |
| 02/27/2002 | CN1079880C Process and device for simultaneously drilling and lining hole |
| 02/27/2002 | CN1079879C Drilling device, drilling system and drilling method |
| 02/26/2002 | US6349780 Drill bit with selectively-aggressive gage pads |
| 02/21/2002 | WO2002014645A1 Drilling apparatus |
| 02/21/2002 | US20020020566 Working tool for a percussion power tool |
| 02/21/2002 | US20020020565 Multi-directional cutters for drillout bi-center drill bits |
| 02/21/2002 | US20020020564 Noncraking cermets comprising polycrystalline diamond, metal nitrides, carbides, borides and/or nitrides, form by compaction, sintering and shaping to from drills or cutters having toughness and wear resistance |
| 02/21/2002 | DE10050229C1 Spiral drill bit for stone has width of raised edge of helical thread increasing along drill bit shaft in direction of drill bit head |
| 02/20/2002 | CN2477707Y Base enlarging appts. for club-footed pile for fundation construction |
| 02/19/2002 | US6348110 Methods of manufacturing rotary drill bits |
| 02/19/2002 | US6347676 Tooth type drill bit with secondary cutting elements and stress reducing tooth geometry |
| 02/14/2002 | US20020017402 Wear protection on rock bits |
| 02/14/2002 | US20020017401 Rolling cone bit with elements fanned along the gage curve |
| 02/13/2002 | CN2476635Y Seismic drilling bit with drop cover for putting explosive |
| 02/13/2002 | CN1079045C Rotary impact type twist drill |
| 02/12/2002 | US6345940 Cutting tools for drilling concrete, aggregate, masonry or the like materials |
| 02/12/2002 | US6345673 High offset bits with super-abrasive cutters |
| 02/07/2002 | US20020014355 Cutting element with improved polycrystalline material toughness and method for making same |
| 02/07/2002 | DE10136692A1 Dichtungsstruktur für einen Abbaumeißel für Gestein Seal structure for a reduction chisel for rock |
| 02/06/2002 | EP1178179A2 Carbide components for drilling tools |
| 02/06/2002 | CN2475817Y Self-weight broad-arm type under-reamed drill bit |
| 02/06/2002 | CN2475816Y Roll-sliding composite bearing with slip cover |
| 02/06/2002 | CN2475815Y A hydraulic structure for tri-cone rotary drill bit |
| 02/06/2002 | CN2475814Y Hydraulic structure for tri-cone rotary drill bit |
| 02/06/2002 | CN2475813Y A hydraulic structure for mono-cone rotary drill bit |
| 02/06/2002 | CN2475812Y A mono-cone rotary drill bit capable of drill super-size borehole well |
| 02/05/2002 | US6343842 Roller bit for tunnel-driving machines with segmented cutting rings |
| 01/31/2002 | WO2001083934A9 Method for the manufacturing of a cone cutter for rotary drilling by crushing, a rotary cone drill bit, a cone cutter and crushing elements therefore |