| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 04/29/1998 | CN1180129A Drill means |
| 04/28/1998 | US5743346 Abrasive cutting element and drill bit |
| 04/28/1998 | US5743345 Drill bit for reverse drilling |
| 04/28/1998 | US5743344 System for in situ replacement of cutting means for a ground drill |
| 04/23/1998 | DE19745947A1 Vorrichtung und Verfahren zum Bohren von Erdformationen Apparatus and method for drilling earth formations |
| 04/22/1998 | EP0837215A2 Rock bit cutter retainer |
| 04/22/1998 | EP0836919A1 A drill bit |
| 04/22/1998 | CN1179810A Rock drilling tool, drill bit and method of transferring percussive energy |
| 04/21/1998 | US5740874 Cutting elements for rotary drill bits |
| 04/21/1998 | US5740873 Rotary bit with gageless waist |
| 04/21/1998 | US5740872 Hardfacing material for rolling cutter drill bits |
| 04/21/1998 | US5740871 Flow diverter ring for a rotary drill bit and method |
| 04/16/1998 | WO1998015714A1 A cutting bit assembly for impinging an earth strata |
| 04/16/1998 | WO1998015710A1 Reaming apparatus with enhanced stability and transition from pilot hole to enlarged bore diameter |
| 04/16/1998 | WO1998015709A1 Rock drill bit and seal means therefor |
| 04/16/1998 | CA2267306A1 A cutting bit assembly for impinging an earth strata |
| 04/15/1998 | EP0835981A2 Cutting structure for rotary drill bits |
| 04/15/1998 | CN2278759Y Concave drill bit |
| 04/15/1998 | CN2278758Y Edge cut type blade bit |
| 04/14/1998 | US5737980 Brazing receptacle for improved PCD cutter retention |
| 04/14/1998 | CA2010796C Downhole milling tool and cutter therefor |
| 04/09/1998 | WO1998014684A1 Earth-boring bit having cutter with replaceable kerf ring with contoured inserts |
| 04/08/1998 | EP0833999A1 A cutter, a stopper means and a method of preventing mud from entering into a cutter |
| 04/07/1998 | US5735648 Tool bit with carrier member and cutting member |
| 04/07/1998 | US5735360 Mining bit |
| 04/07/1998 | US5735359 Wellbore cutting tool |
| 04/02/1998 | WO1998013575A1 Bit assembly |
| 04/02/1998 | WO1998013573A1 Tilted axis rotary rock cutters with readily replaceable cutter rings |
| 04/02/1998 | WO1998013572A1 Combination milling tool and drill bit |
| 04/02/1998 | WO1998013554A1 Bearing capacity enhancement for piling applications |
| 04/02/1998 | WO1998013317A2 Method and apparatus for infiltrating or sintering preformed components and components assemblies |
| 04/02/1998 | WO1998013159A1 Drill bit manufacturing method |
| 04/01/1998 | EP0832344A2 Down hole hammer assembly |
| 04/01/1998 | CN2277452Y Structure of separating borehole-enlarging drill bit |
| 03/31/1998 | US5732784 For drilling a bore hole in an earth formation |
| 03/31/1998 | US5732783 In or relating to rotary drill bits |
| 03/31/1998 | US5732770 Wellbore cutter |
| 03/25/1998 | EP0831180A1 Drill for making a hole in the ground and method applying this drill |
| 03/25/1998 | CN2276985Y Pressure balance sealed bearing tri-cone rotary drill bit |
| 03/25/1998 | CN1177018A Cemented carbide body with improved high temp. and thermomechanical properties |
| 03/24/1998 | US5729992 Refrigerant charge control system for heat pump |
| 03/18/1998 | EP0828917A2 Predominantly diamond cutting structures for earth boring |
| 03/18/1998 | EP0828916A1 Percussion drill bit, an insert, a use and a method of maintaining the drill bit diameter |
| 03/18/1998 | EP0828915A1 Rotary cone drill bit modular arm |
| 03/17/1998 | US5727629 Wellbore milling guide and method |
| 03/13/1998 | CA2214175A1 Drilling apparatus and drilling method for renovating underground pipes |
| 03/10/1998 | US5725313 Rolling cutter drill bits |
| 03/04/1998 | EP0826071A1 Cemented carbide body with increased wear resistance |
| 03/04/1998 | EP0615571B1 Methods of manufacturing a hub for use in a cutter of a boring head. |
| 03/03/1998 | US5722499 Multiple diamond layer polycrystalline diamond composite cutters |
| 03/03/1998 | US5722498 Soil displacement auger head for installing piles in the soil |
| 03/03/1998 | US5722497 Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces |
| 03/03/1998 | US5722489 Multipurpose drilling tool |
| 02/26/1998 | WO1998007951A1 Rotary-percussion drill apparatus and method |
| 02/25/1998 | EP0824626A1 Drilling tool |
| 02/24/1998 | US5720357 Cutter assemblies for rotary drill bits |
| 02/24/1998 | US5720355 Drill bit instrumentation and method for controlling drilling or core-drilling |
| 02/24/1998 | US5720349 For wellbore milling operations |
| 02/24/1998 | CA2056049C Drill bit |
| 02/17/1998 | CA2140828C Compound diamond cutter |
| 02/12/1998 | WO1998005846A1 Apparatus and method for cutting a tubular in a wellbore |
| 02/12/1998 | WO1998005476A1 Forwardly located bit retention means |
| 02/12/1998 | WO1997048873A3 Non-symmetrical stress-resistant rotary drill bit cutter element |
| 02/12/1998 | DE19626589C1 Sinking boreholes in soft ground |
| 02/12/1998 | CA2262635A1 Apparatus and method for cutting a tubular in a wellbore |
| 02/11/1998 | EP0823535A2 Earth roller dril bit with cutting structure |
| 02/11/1998 | CN1172889A Rotating high-pressure injection slip casting single-pipe double-injection drill |
| 02/10/1998 | US5715899 Hard facing material for rock bits |
| 02/05/1998 | WO1998004804A1 Apparatus and method for milling a hole in casing |
| 02/05/1998 | WO1997048874A3 Cutter element adapted to withstand tensile stress |
| 02/05/1998 | DE19630639A1 Mine percussive drilling machine |
| 02/04/1998 | EP0822318A1 Improvements in or relating to rotary drill bits |
| 01/29/1998 | WO1998003772A1 Spiral-shaped roller cutter and tunnel excavator cutter head provided with same |
| 01/29/1998 | WO1998003769A1 A disc cutter |
| 01/29/1998 | WO1998003765A1 Improved disc cutter and excavation equipment |
| 01/29/1998 | WO1998003764A1 Underground warning system for underground conduits or pipes |
| 01/29/1998 | CA2261003A1 A disc cutter |
| 01/28/1998 | EP0821132A2 Seal assembly for rolling cutter drill bits |
| 01/27/1998 | US5711702 Curve cutter with non-planar interface |
| 01/22/1998 | WO1998002633A1 Rotary cone drill bit with integral stabilizers |
| 01/21/1998 | EP0819819A1 Milling head,drilling device and method for underwater drilling |
| 01/21/1998 | EP0819777A1 Cemented carbide body with improved high temperature and thermomechanical properties |
| 01/21/1998 | CN1171072A Improved segmented cutting tools |
| 01/21/1998 | CN1171070A Composite cermet articles and method of making |
| 01/21/1998 | CN1171069A Composite cermet articles and method of making |
| 01/21/1998 | CN1171068A Composite cermet articles and method of making |
| 01/20/1998 | US5709279 Drill bit insert with sinusoidal interface |
| 01/20/1998 | US5709278 Rotary cone drill bit with contoured inserts and compacts |
| 01/15/1998 | DE19712181A1 Drill bit |
| 01/13/1998 | US5707180 Method and apparatus for forming piles in-situ |
| 01/13/1998 | US5706906 Superabrasive cutting element with enhanced durability and increased wear life, and apparatus so equipped |
| 01/08/1998 | WO1998000625A1 Drill bit with set of underreamer arms |
| 01/08/1998 | WO1998000624A1 Boring tool for reverse circulation |
| 01/07/1998 | EP0815345A1 Milling tool, whipstock, milling system and method of forming a window in the wall of a tubular |
| 01/07/1998 | EP0815344A1 Whipstock |
| 01/07/1998 | EP0815340A1 Rock drilling tool, drill bit and a method of transferring percussive energy |
| 01/07/1998 | CN1169765A A drilling method and bit assembly to realise method |
| 01/06/1998 | US5704438 Rotary borer |
| 12/31/1997 | WO1997049890A1 Method for measurement of the airflow in rock drill bits as well as measurement means for accomplishing said method |
| 12/31/1997 | CN2271607Y Reducing expanding drill |