| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 02/18/1999 | WO1999007977A1 Drilling tool for down-the-hole drilling, reamer means and body element for use in the tool |
| 02/18/1999 | WO1999007976A1 Roller cone drill bit with lubricant pressure compensating device |
| 02/17/1999 | CN2307905Y Drill and enlarging hole device |
| 02/17/1999 | CN2307904Y Tri-cone rotary drill bit cutting structure |
| 02/17/1999 | CN2307903Y Gear wheel lock device heavy-caliber assembly tri-cone rotary drill bit |
| 02/17/1999 | CN1208117A Geological cutting drill bit |
| 02/16/1999 | US5871060 Attachment geometry for non-planar drill inserts |
| 02/16/1999 | CA2150095C Drill bit reamer stabilizer |
| 02/11/1999 | WO1999006667A2 Claw tooth rotary bit |
| 02/11/1999 | WO1999006194A2 Rotary spade drill arrangement |
| 02/11/1999 | WO1999006193A2 Rotary drill arrangement |
| 02/11/1999 | DE19734068A1 Bore point for earth displacement borer |
| 02/10/1999 | EP0725886A4 Device and method for augering a conical hole in solid media |
| 02/09/1999 | US5868502 Thrust disc bearings for rotary cone air bits |
| 02/09/1999 | US5868213 Steel tooth cutter element with gage facing knee |
| 02/09/1999 | US5868212 Stabiliser tool |
| 02/03/1999 | EP0894181A1 Rotary rock bit with infiltrated bearings |
| 02/02/1999 | USH1780 Soil sample core system |
| 01/28/1999 | WO1999004130A1 Reverse circulation drilling system with bit locked underreamer arms |
| 01/28/1999 | WO1999004129A1 Rotatable cutting bit assembly with wedge-lock retention assembly |
| 01/28/1999 | WO1999004128A2 Rotatable cutting bit assembly with cutting inserts |
| 01/28/1999 | CA2296470A1 Reverse circulation drilling system with bit locked underreamer arms |
| 01/28/1999 | CA2293276A1 Rotatable cutting bit assembly with cutting inserts |
| 01/28/1999 | CA2293251A1 Rotatable cutting bit assembly with wedge-lock retention assembly |
| 01/27/1999 | EP0893572A1 Improvements in or relating to elements faced with superhard material |
| 01/26/1999 | US5862873 Elements faced with superhard material |
| 01/26/1999 | US5862871 Axial-vortex jet drilling system and method |
| 01/21/1999 | WO1999002816A1 Core barrel |
| 01/20/1999 | EP0891467A1 Polycrystalline diamond cutter with enhanced durability and increased wear life |
| 01/20/1999 | EP0891239A1 Twist drill with asymmetrically spaced support margins |
| 01/19/1999 | US5860773 Drilling tool with rounded insert support surfaces |
| 01/13/1999 | EP0890705A2 Drill bit with cutting elements having a nanocrystalline diamond cutting surface |
| 01/12/1999 | CA2160042C Drilling tool bit with a carrier member and cutter member |
| 01/07/1999 | EP0888490A2 Mill for wellbore milling operations |
| 01/07/1999 | DE19736858A1 Drill crown for horizontal hammer drilling |
| 01/06/1999 | CN1204378A Fluid drilling system |
| 01/05/1999 | US5856626 Cemented carbide body with increased wear resistance |
| 01/05/1999 | US5855247 Rolling-cutter earth-boring bit having predominantly super-hard cutting elements |
| 01/01/1999 | CA2567355A1 Protected lubricant reservoir for sealed bearing earth boring drill bit |
| 12/30/1998 | WO1998059148A1 Cutting element tip configuration for an earth-boring bit |
| 12/30/1998 | WO1998059147A1 Drill bit directional nozzle |
| 12/30/1998 | EP0886715A1 Rock drill bit and a rock drilling tool |
| 12/29/1998 | US5853245 Rock bit cutter retainer with differentially pitched threads |
| 12/29/1998 | US5853055 For drilling bore holes in earth formations |
| 12/29/1998 | US5853054 2-Stage underreamer |
| 12/23/1998 | EP0885343A1 Directional boring |
| 12/23/1998 | CN2301530Y Anchor rod base-enlarging drill bit |
| 12/23/1998 | CN1041293C 钻孔工具 Drilling Tools |
| 12/16/1998 | EP0884449A1 Rotary drill bits |
| 12/16/1998 | EP0884448A2 Rock drill bit with helical evacuation grooves |
| 12/16/1998 | EP0883730A1 A drilling apparatus |
| 12/15/1998 | US5848657 Polycrystalline diamond cutting element |
| 12/10/1998 | WO1998055730A1 Retrieval head for a drill bit composed of a plurality of bit segments |
| 12/10/1998 | CA2293594A1 Retrieval head for a drill bit composed of a plurality of bit segments |
| 12/09/1998 | EP0882170A1 Axial-vortex jet drilling system and method |
| 12/09/1998 | CN1041065C Hollow drill bit with end cutting edge |
| 12/08/1998 | US5845721 Drilling device and method of drilling wells |
| 12/08/1998 | US5845547 Tool having a tungsten carbide insert |
| 12/08/1998 | CA2151276C An insert for releasably retaining cutting means in a ground drill |
| 12/08/1998 | CA2151275C A drive sub for receipt of bit segments |
| 12/08/1998 | CA2151274C Bit segment for seating in a cutting position to form cutting means |
| 12/08/1998 | CA2151273C A tool for transporting cutting means for in situ replacement of cutting means |
| 12/08/1998 | CA2151272C System for in situ replacement of cutting means for a ground drill |
| 12/03/1998 | WO1998054497A1 Encapsulated elastomeric relief valve |
| 12/03/1998 | WO1998054437A1 Drill bit nozzle and method of attachment |
| 12/03/1998 | WO1998054436A1 Drilling tool |
| 12/03/1998 | WO1998054435A1 Drilling tool |
| 12/03/1998 | WO1998054434A1 Drilling tool, especially a rock drill |
| 12/03/1998 | DE19722519A1 Bohrwerkzeug Drilling tool |
| 12/03/1998 | DE19722518A1 Bohrwerkzeug, insbesondere Gesteinsbohrer Drilling tool, in particular rock drill |
| 12/03/1998 | DE19722517A1 Bohrwerkzeug Drilling tool |
| 12/02/1998 | EP0880418A1 Method of making a carbide cutting insert |
| 12/02/1998 | CN2299147Y Drilling tool for underground big pipeline shed |
| 12/02/1998 | CN1200784A Cutting tool for drilling concrete, aggregate or masonry |
| 12/01/1998 | US5842701 Dual functioning seal for rock bits |
| 12/01/1998 | US5842700 Composite rock bit seal |
| 12/01/1998 | US5842531 Rotary rock bit with infiltrated bearings |
| 11/26/1998 | DE19721383A1 Drilling tool blockage prevention system |
| 11/25/1998 | CN2298339Y Insert drill bit |
| 11/25/1998 | CN1199660A Drilling tool |
| 11/24/1998 | US5839526 For cutting a borehole in accordance to a gage curve |
| 11/24/1998 | US5839525 For drilling subsurface formations |
| 11/24/1998 | US5839523 Methods and apparatus for lubricating a rotary cutter |
| 11/24/1998 | US5839329 Method for infiltrating preformed components and component assemblies |
| 11/24/1998 | CA2140830C Rock bit back reaming inserts |
| 11/24/1998 | CA2013804C Drilling |
| 11/18/1998 | EP0878603A2 Well conduit cutting and milling apparatus and method |
| 11/18/1998 | EP0878602A2 Cutting elements faced with superhard material |
| 11/18/1998 | EP0878261A1 Drilling tool |
| 11/18/1998 | EP0877855A1 Diamond coated cutting tool insert and method of making same |
| 11/17/1998 | US5837071 Diamond coated cutting tool insert and method of making same |
| 11/17/1998 | US5836410 Percussive blow assisted rotary drill |
| 11/17/1998 | US5836409 Monolithic self sharpening rotary drill bit having tungsten carbide rods cast in steel alloys |
| 11/17/1998 | US5836408 Rotary percussion blow assisted drill |
| 11/17/1998 | US5836404 Drill bits with enhanced hydraulic flow characteristics |
| 11/17/1998 | US5836387 System for securing an item in a tubular channel in a wellbore |
| 11/11/1998 | EP0877146A2 Well conduit cutting and milling apparatus and method |
| 11/11/1998 | EP0876545A1 Method for forming a window in a tubular and apparatus for use in said method |
| 11/11/1998 | CN1198502A Boring device and torque support for boring device |
| 11/10/1998 | US5833399 In the ground |