| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 03/13/1990 | CA1266651A1 Rock drill with cutting inserts |
| 03/08/1990 | WO1990002244A1 A drill for rock and concrete |
| 03/08/1990 | WO1990002243A1 Drills for piles and soil stabilization |
| 03/08/1990 | WO1990001986A1 Diamond compact possessing low electrical resistivity |
| 03/07/1990 | EP0357380A2 Manufacture of abrasive products |
| 03/07/1990 | EP0357379A2 Manufacture of abrasive products |
| 03/07/1990 | EP0356657A2 Apparatus for taking core samples |
| 03/07/1990 | CN1040244A Cemented carbide tip |
| 03/07/1990 | CN1040164A Cemented and cemented/sintered superabrasive polycrystalline bodies and method of manufacture thereof |
| 03/06/1990 | US4905773 Self-propelled subsoil penetrating tool system |
| 03/06/1990 | CA1266381A1 Brazed composite compact implements |
| 02/28/1990 | EP0356097A2 Tool insert |
| 02/28/1990 | EP0355379A2 Drilling-injection anchor |
| 02/28/1990 | CN2053664U Drilling tool for enlarging pile hole |
| 02/27/1990 | US4904119 Process for placing a piling in the ground, a drilling machine and an arrangement for implementing this process |
| 02/27/1990 | US4903787 Rock drill |
| 02/27/1990 | US4903786 Earth boring bit with improved two piece bearing and seal assembly |
| 02/27/1990 | US4903785 Drilling and chiseling tool bit |
| 02/22/1990 | WO1990001384A1 Investment casting process |
| 02/21/1990 | CN2053235U Underwater percussion bit |
| 02/21/1990 | CN2053234U Slotted drill bit for hidden-hole driller and its slotting device |
| 02/20/1990 | US4902073 Cutter pick for mining using hydraulic stream |
| 02/14/1990 | CN2052809U Carbide rock drill |
| 02/13/1990 | US4900164 Axial retainer for a cutter in a rotary drill bit |
| 02/13/1990 | US4899838 Earth boring bit with convergent cutter bearing |
| 02/13/1990 | US4899835 For eroding earth in a forward path |
| 02/13/1990 | US4899834 Electromagnetic drilling apparatus |
| 02/13/1990 | CA1265729A1 Simultaneous carburizing and boronizing of earth boring drill bits |
| 02/08/1990 | WO1990001107A1 Cemented carbide tip |
| 02/07/1990 | EP0354164A2 Blade drill bit and method for its construction |
| 02/07/1990 | EP0353962A2 Casing cutters |
| 02/07/1990 | CN2052432U Multi-knife drilling tool for the brick-wall |
| 02/06/1990 | US4898252 Cutting structures for rotary drill bits |
| 01/31/1990 | EP0353214A2 Drill bit with cemented carbide inserts |
| 01/31/1990 | EP0352895A2 Cutting elements for rotary drill bits |
| 01/31/1990 | EP0352811A1 Thermally stable superabrasive products and methods of manufacture thereof |
| 01/31/1990 | EP0352546A2 Core drill bit |
| 01/25/1990 | DE3825107A1 Rock drill with cutting tip |
| 01/24/1990 | EP0352215A2 Drilling tool |
| 01/24/1990 | EP0351952A2 Convex-shaped diamond cutting elements |
| 01/24/1990 | EP0351699A2 Core drill bit |
| 01/24/1990 | EP0351493A2 Stone drill bit |
| 01/24/1990 | CN2051665U Drilling bit working condition adjusting joint |
| 01/23/1990 | US4895215 Seal cage assembly for relatively movable members |
| 01/23/1990 | CA1264734A1 Kerfing drag bit |
| 01/17/1990 | EP0351039A2 Roller cutter bit and method of forming the same |
| 01/17/1990 | EP0350676A1 Tool for forming groove in brittle object and method of fracturing same |
| 01/17/1990 | EP0350526A1 Non-core drill |
| 01/17/1990 | CN2051278U Step compound blade bit |
| 01/16/1990 | US4893675 Section milling tool |
| 01/11/1990 | WO1990000216A1 A device for drilling in and/or lining holes in earth |
| 01/10/1990 | EP0350045A2 Drill bit with composite cutting members |
| 01/10/1990 | EP0349846A1 Core drill bit |
| 01/09/1990 | US4892159 Kerf-cutting apparatus and method for improved drilling rates |
| 01/09/1990 | CA1264318A1 Drill bit |
| 01/09/1990 | CA1264317A1 Diamond type drilling tool |
| 01/09/1990 | CA1264316A1 Wire line core barrel |
| 01/09/1990 | CA1264238A1 Drill bit manufacturing method |
| 01/08/1990 | EP0267920A4 Bearing and manufacture thereof. |
| 01/03/1990 | EP0349172A1 Hard facing |
| 01/02/1990 | US4890782 Insert of diamond or boron nitride compacts, hard metal or alloy support with cemented carbide interface |
| 12/27/1989 | EP0347602A2 Rock drill bit |
| 12/27/1989 | EP0347601A1 Drilling tool with a conveying spiral |
| 12/27/1989 | CN2050069U Yzyh type drill rod head |
| 12/26/1989 | US4889200 Rock drill |
| 12/26/1989 | US4889197 Hydraulic operated underreamer |
| 12/26/1989 | US4889194 Method and a device for deep hole drilling |
| 12/26/1989 | US4889017 Rotary drill bit for use in drilling holes in subsurface earth formations |
| 12/20/1989 | EP0347033A2 Borehole underreamers |
| 12/20/1989 | EP0346924A2 Diamond drill bit |
| 12/20/1989 | CN2049673U Double-acting type rope coring hydrodynamic thrust rotating drill |
| 12/20/1989 | CN1006134B Tool for braze welding composite stamped products and method for mfg. same |
| 12/19/1989 | US4887677 Low pressure drill bit |
| 12/19/1989 | US4887675 Earth boring bit with pin mounted compensator |
| 12/19/1989 | US4887668 Cutting tool for cutting well casing |
| 12/19/1989 | US4887493 Roller cutter drill bit and method of forming |
| 12/14/1989 | DE3918132A1 Device for securing a tool inside a pipe sunk in the ground |
| 12/13/1989 | CN2049260U Drill-bit changing device without withdrawing drilling pipe |
| 12/13/1989 | CN1037944A Apparatus for making holes in soil |
| 12/12/1989 | US4886710 Hardness, machinability |
| 12/12/1989 | US4886131 Inclined-jet drilling tool |
| 12/12/1989 | EP0298114A4 Rotary drill bit. |
| 12/06/1989 | EP0345096A1 Drill bit |
| 12/05/1989 | US4884477 Rotary drill bit with abrasion and erosion resistant facing |
| 11/30/1989 | WO1989011580A1 Instrument for percussion-rotary drilling |
| 11/29/1989 | EP0343800A2 Apparatus for providing an underground tunnel |
| 11/29/1989 | EP0343653A1 Milling tool and process for underreaming drilling holes |
| 11/28/1989 | US4883136 Large compact cutter rotary drill bit utilizing directed hydraulics for each cutter |
| 11/28/1989 | US4883135 Apparatus for rock drill |
| 11/28/1989 | US4883133 Combustion operated drilling apparatus |
| 11/28/1989 | US4883132 Drag bit for drilling in plastic formation with maximum chip clearance and hydraulic for direct chip impingement |
| 11/28/1989 | US4883129 Bit assembly utilizing carbide insert |
| 11/28/1989 | US4882859 Excavating bucket having scoops |
| 11/28/1989 | CA1263374A1 Enhanced circulation drill bit |
| 11/21/1989 | CA1263109A1 Integral blade hole opener |
| 11/21/1989 | CA1263108A1 Pocketed stud for polycrystalline diamond cutting blanks |
| 11/16/1989 | WO1989011005A1 Device for making wells in ground |
| 11/15/1989 | CN2047710U Slotted drilling tool for coal-mining electrical driller |
| 11/14/1989 | US4880278 Cutting tool for a mining machine |
| 11/14/1989 | US4880154 Brazing |