| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 03/09/1989 | WO1989002023A1 Radially stabilized drill bit |
| 03/09/1989 | WO1989001837A1 Rotating, radially impacting rollers, balls or similar for excavating/milling of rocks or other materials |
| 03/08/1989 | CN2033850U Inoculated polycrystal line insert drill with multiblade scrapers |
| 03/07/1989 | US4809793 Enhanced diameter clean-out tool and method |
| 03/07/1989 | US4809790 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/07/1989 | US4809779 Arrangement for cleaning internal surface of casing strings |
| 03/07/1989 | CA1250829A1 Rock bit lubrication system |
| 03/01/1989 | CN2033440U Rotation and plug-in type soil picker |
| 02/23/1989 | WO1989001561A1 Annular shim for construction bit having multiple perforations for stress relief |
| 02/22/1989 | CN2033046U Sand blower with water and gas dual-purpose |
| 02/22/1989 | CN2033045U Artificial diamond core-extracting drill bit |
| 02/21/1989 | US4805709 Drill bit and drill assembly |
| 02/21/1989 | US4805705 Drill bit |
| 02/15/1989 | EP0303419A1 Process for laser hardsurfacing drill bit cones having hard cutter inserts |
| 02/14/1989 | US4804295 Shielded tunnel excavator |
| 02/14/1989 | US4804049 Rotary drill bits |
| 02/09/1989 | WO1989001086A1 Masonry two-prong rotary drill bit |
| 02/07/1989 | US4802539 Polycrystalline diamond bearing system for a roller cone rock bit |
| 02/01/1989 | EP0301890A2 Hydraulic operated reamer |
| 01/31/1989 | CA1249606A1 Cemented carbide body used preferably for rock drilling and mineral cutting |
| 01/25/1989 | EP0300699A2 Bearings for rock bits |
| 01/18/1989 | EP0299740A2 Method of brazing |
| 01/18/1989 | EP0299737A2 Tool component |
| 01/18/1989 | EP0299624A2 Apparatus and method for installing a conduit within an arcuate bore |
| 01/17/1989 | CA1248939A1 Exposed polycrystalline diamond mounted in a matrix body drill bit |
| 01/11/1989 | EP0298663A2 Downhole cutting tool |
| 01/11/1989 | EP0298537A2 Device and method for underreaming a borehole |
| 01/11/1989 | EP0298114A1 Rotary drill bit. |
| 01/11/1989 | CN2030652U Heavy-calibre drilling machine |
| 01/10/1989 | US4797138 Metal carbide containing cementing agent |
| 01/10/1989 | US4796713 Activated earth drill |
| 01/10/1989 | CA1248519A1 Composite tool and a process for the production of the same |
| 01/03/1989 | US4794995 Orientable fluid nozzle for drill bits |
| 01/03/1989 | US4794994 Drag drill bit having improved flow of drilling fluid |
| 01/03/1989 | US4794822 Rock bit manufacturing method |
| 01/03/1989 | CA1248008A1 Leak proof, high pressure, high velocity fluid jet cutting nozzle |
| 12/29/1988 | WO1988010163A1 A method for producing a cutting edge for a roller bit |
| 12/28/1988 | EP0297072A2 Diamond tools for rock drilling and machining |
| 12/28/1988 | EP0297071A1 Temperature resistant abrasive polycrystalline diamond bodies |
| 12/28/1988 | EP0296208A1 Inclined jet drilling tool. |
| 12/27/1988 | US4793828 Tool with diamond particle insert; no graphitization |
| 12/27/1988 | US4793740 Drilling system |
| 12/27/1988 | US4793719 Precision roller bearing rock bits |
| 12/27/1988 | US4793427 Disc cutters for rock working machines |
| 12/27/1988 | US4793426 Drill bit with covered ring nozzle retainer |
| 12/27/1988 | US4793425 Profiled body roller-reamer stabilizer |
| 12/27/1988 | US4793424 Self-lubricating well tools and seal elements therefor |
| 12/20/1988 | US4792001 Rotary drill bit |
| 12/20/1988 | US4792000 Method and apparatus for well drilling |
| 12/15/1988 | WO1988009826A1 Improved coated pcd elements and products and methods |
| 12/15/1988 | DE3718158A1 Device for producing an undercut in a cylindrically predrilled hole and anchor rod for inserting in a drilled hole |
| 12/14/1988 | EP0295151A2 Improvements in or relating to the manufacture of cutting elements for rotary drill bits |
| 12/14/1988 | EP0295045A2 Rotary drag bit having scouring nozzles |
| 12/14/1988 | EP0295032A2 Rock bit |
| 12/14/1988 | CN87103863A Conical spiral drill for oil well |
| 12/13/1988 | US4790689 Method and apparatus for producing a support element in the ground |
| 12/13/1988 | US4790397 Rotary drilling device |
| 12/13/1988 | US4790396 Rotary drill bits for use in coring holes in subsurface formations |
| 12/13/1988 | US4790394 Hydraulic drilling apparatus and method |
| 12/13/1988 | US4790391 Air pressure impact drilling method and apparatus for same |
| 12/06/1988 | CA1246050A1 Rotary drill bits |
| 12/06/1988 | CA1246049A1 Rotary drill bits |
| 11/30/1988 | CN88102869A Cutter assembly for rotary boring of earth |
| 11/29/1988 | US4787466 Cutting component |
| 11/29/1988 | US4787465 Hydraulic drilling apparatus and method |
| 11/29/1988 | US4787464 Variable rake mine tool insert and method of use |
| 11/29/1988 | US4787129 Metal of manufacturing a composite journal bushing |
| 11/29/1988 | CA1245625A1 Multi-component cutting element using consolidated rod-like polycrystalline diamond |
| 11/29/1988 | CA1245624A1 Multi-component cutting element using polycrystalline diamond disks |
| 11/22/1988 | US4785895 Drill bit with wear indicating feature |
| 11/22/1988 | US4785894 Apparatus for detecting drill bit wear |
| 11/17/1988 | EP0291314A2 Cutting structure and rotary drill bit comprising such a structure |
| 11/15/1988 | US4784438 Tunneling machine rotatable member |
| 11/15/1988 | US4784231 Extended drill bit nozzle having side discharge ports |
| 11/15/1988 | US4784230 For drilling an underground pilot bore hole |
| 11/15/1988 | US4784023 Cutting element having composite formed of cemented carbide substrate and diamond layer and method of making same |
| 11/15/1988 | CA1244820A1 Rotary drill bit with cutting elements having a thin abrasive front layer |
| 11/09/1988 | EP0289988A1 Rotating tool for undercutting in a drill hole |
| 11/09/1988 | EP0289668A1 Roller drill bit with a cone-retaining means |
| 11/09/1988 | CN88102386A Hammer drills for making boreholes |
| 11/08/1988 | US4782903 Replaceable insert stud for drilling bits |
| 11/08/1988 | CA1244400A1 Earth boring bit with improved rigid face seal assembly |
| 11/02/1988 | EP0289457A1 Rotary drilling device |
| 11/02/1988 | EP0288780A2 Extrusion tool for making a drill blank with at least one internal helical flush bore |
| 11/02/1988 | EP0288775A1 Earth working tool having a working element fabricated from cemented tungsten carbide compositions with enhanced properties |
| 11/02/1988 | CN88212343U Columnar drill rod made of hard alloy |
| 11/02/1988 | CN88102185A Rotary drilling device |
| 11/01/1988 | US4781770 Process for laser hardfacing drill bit cones having hard cutter inserts |
| 11/01/1988 | CA1244001A1 Cutter assembly |
| 10/27/1988 | DE3811370A1 Bohrkopf mit einstueckig geschmiedetem stabilisator Drilling head with integral forged stabilizer |
| 10/26/1988 | EP0288180A2 Down-the-hole drill hammer |
| 10/26/1988 | CN87211268U Grooved drill |
| 10/25/1988 | US4780274 Using powder metallurgy |
| 10/25/1988 | US4779689 Soil auger |
| 10/25/1988 | CA1243666A1 Drill bit with full offset cutter bodies |
| 10/20/1988 | WO1988008070A1 Fluid jet assisted cone-type drill bit assembly and method |
| 10/19/1988 | CN88203104U Cold pressing ball tooth bit head |
| 10/19/1988 | CN87102485A Making method of polymerized crystal diamond composite teeth drill bit |
| 10/12/1988 | EP0285889A2 Stabilizer for deep-drilling tools |
| 10/12/1988 | EP0285678A1 Earth boring bit for soft to hard formations |