| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 10/12/1988 | CN87205282U Ensemble telescopic tools for changing drill bits at the bottom of the well hole |
| 10/11/1988 | US4776599 In a rolling cone rock bit |
| 10/11/1988 | US4776413 Button insert for rock drill bits |
| 10/11/1988 | US4776412 Nozzle assembly for rotary drill bit and method of installation |
| 10/11/1988 | US4776411 Fluid flow control for drag bits |
| 10/11/1988 | US4776410 Stabilizing tool for well drilling |
| 10/06/1988 | DE3809768A1 Method and apparatus for extraction underground |
| 10/05/1988 | CN88211315U Combined driving drill bit |
| 09/28/1988 | EP0284579A1 Cemented carbide tool |
| 09/28/1988 | EP0284238A2 Drag drill bit with drilling fluid nozzles |
| 09/28/1988 | EP0283605A1 Cutter tool tip inserts |
| 09/27/1988 | US4773491 Drill head assembly |
| 09/27/1988 | CA1242463A1 Multi-insert cutter bit |
| 09/20/1988 | US4772294 Brazed composite compact implements |
| 09/20/1988 | US4771834 Percussion drill bit for rock perforators |
| 09/20/1988 | CA1242185A1 Bore hole enlarging arrangement and method |
| 09/15/1988 | DE3728269C1 Overburden drilling device |
| 09/14/1988 | EP0282431A2 Volume and pressure balanced rigid face seal for rock bits |
| 09/14/1988 | EP0281997A1 Rock drill |
| 09/14/1988 | CN87205294U Sampling driller with back sticky wall valve |
| 09/13/1988 | US4770259 Drill tool |
| 09/13/1988 | US4770068 Apparatus for assembling rock bits |
| 09/13/1988 | CA1241946A1 Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks |
| 09/13/1988 | CA1241945A1 Rotary drill bits |
| 09/07/1988 | EP0280835A1 Hollow drill tool |
| 08/30/1988 | US4767050 Support bonded to cemented carbide substrate by brazing filler |
| 08/23/1988 | US4766040 Temperature resistant abrasive polycrystalline diamond bodies |
| 08/23/1988 | US4765419 Rock drill with cutting inserts |
| 08/23/1988 | US4765417 Reaming apparatus for well drilling |
| 08/23/1988 | US4765205 For rotary earth drilling |
| 08/23/1988 | CA1240983A1 Downhole retrievable drill bit |
| 08/18/1988 | DE3803910A1 Drill bit |
| 08/16/1988 | US4764434 Diamond tools for rock drilling and machining |
| 08/16/1988 | US4764255 High melting, shrink-fitted cast iron or steel cup surrounds and protects bit |
| 08/16/1988 | US4763737 For use in well casings |
| 08/16/1988 | US4763736 Asymmetrical rotary cone bit |
| 08/10/1988 | CN87213614U Die set for soldering diamond bit |
| 08/09/1988 | US4762189 Seal and seal shield assembly for rotary drill bits |
| 08/09/1988 | US4762188 Drill bit |
| 08/09/1988 | US4762028 Rotary drill bits |
| 08/09/1988 | CA1240311A1 Mining drill bit |
| 08/09/1988 | CA1240216A1 Materials transformable from the nonamorphous to the amorphous state under frictional loadings |
| 08/04/1988 | DE3702144A1 Percussion drilling unit for rotary percussion drilling in minerals, rocks and ores |
| 08/03/1988 | CN87100397A Erosion resistant rock drill bit |
| 08/02/1988 | US4761191 Method of forming closely sized openings |
| 08/02/1988 | US4760890 Cutter assembly for rotary boring of earth |
| 08/02/1988 | US4760888 Drill bit for core boring |
| 07/28/1988 | WO1988005492A1 Rotary drill bit |
| 07/28/1988 | WO1988005491A1 Fusion-drilling process |
| 07/26/1988 | US4759415 Rock bit with improved extended nozzle |
| 07/20/1988 | EP0274711A1 Cutting tool for a mining machine |
| 07/20/1988 | EP0274645A1 Erosion resistant cutting bit with hardfacing |
| 07/20/1988 | CN87216969U Welded scraper-drill with wings |
| 07/14/1988 | WO1988005117A1 Ring cutter for tunnel and shaft drilling in rock |
| 07/14/1988 | WO1988005107A1 Inclined jet drilling tool |
| 07/13/1988 | EP0274265A2 Roller reamer assembly |
| 07/12/1988 | US4756631 Diamond bearing for high-speed drag bits |
| 07/12/1988 | US4756373 Rock drilling bit and a method of producing the same |
| 07/12/1988 | CA1239142A1 Rotary drill bit |
| 07/06/1988 | CN87211660U Broaching bit in shallow hole |
| 07/05/1988 | US4754818 Method of measuring drill bit fluid flow |
| 07/05/1988 | US4754526 System including a multi-stepped nozzle assembly for back-boring an inground passageway |
| 07/05/1988 | CA1238897A1 Drill bits with cone retention means |
| 07/05/1988 | CA1238896A1 Hydrodynamic lubricant seal for drill bits |
| 07/05/1988 | CA1238895A1 Earth boring bit with bearing sleeve |
| 06/29/1988 | EP0272913A2 Tool insert |
| 06/29/1988 | EP0272905A2 Nozzle assembly for enlarging an inground passageway |
| 06/29/1988 | CN87214938U Explosive-falling drill tool without drawing bit |
| 06/28/1988 | US4753305 Cutter mounting for drag bits |
| 06/28/1988 | US4753304 Volume and pressure balanced rigid face seal for rock bits |
| 06/28/1988 | US4753303 Earth boring bit with two piece bearing and rigid face seal assembly |
| 06/28/1988 | CA1238630A1 Conical cutters for drill bits, and processes to produce same |
| 06/21/1988 | US4751972 Revolving cutters for rock bits |
| 06/21/1988 | CA1238309A1 Copper-based spinodal alloy bearings |
| 06/21/1988 | CA1238308A1 Self sharpening drag bit for sub-surface formation drilling |
| 06/14/1988 | US4750573 Drill bit having a flush-out port |
| 06/14/1988 | CA1238036A1 Rotary drill bits |
| 06/14/1988 | CA1237952A1 Method and apparatus for detecting wear of a rotatable bit |
| 06/08/1988 | EP0269653A1 Apparatus for correcting irregularities in or enlarging an underground duct. |
| 06/08/1988 | EP0269638A1 A method and a device for deep hole drilling. |
| 06/07/1988 | US4749053 Drill bit having a thrust bearing heat sink |
| 06/07/1988 | US4749052 Cutting element adapted to be pushed into a recess of a drill bit body |
| 06/07/1988 | US4749051 Drill steel |
| 06/07/1988 | US4749050 Through the ground |
| 06/01/1988 | EP0269400A2 Improvements in or relating to rotary drill bits |
| 06/01/1988 | CN87105588A Drilling apparatus and cutter |
| 05/31/1988 | US4747604 Rotary shaft seal for drill bit cutters |
| 05/31/1988 | CA1237424A1 Rotary drill bit |
| 05/31/1988 | CA1237273A1 Tool with soldered tip |
| 05/25/1988 | EP0268306A2 Downhole tool body |
| 05/25/1988 | EP0268188A1 Shielded tunnel excavator |
| 05/25/1988 | EP0267920A1 Bearing and manufacture thereof |
| 05/24/1988 | CA1237122A1 Rock bits having metallurgically bonded cutter inserts |
| 05/24/1988 | CA1237121A1 Rotary drill bits and cutting elements for such bits |
| 05/19/1988 | DE3639107A1 Operating process for producing lateral branches on concrete pipes, in particular sewer pipes, and diamond drilling tool for this purpose |
| 05/18/1988 | CN86104915A Drilling technique of a special section hole using a pneumatic chisel |
| 05/17/1988 | US4744427 Bit design for a rotating bit incorporating synthetic polycrystalline cutters |
| 05/17/1988 | US4744270 Method for thermally fitting hard teeth in rock bits |
| 05/11/1988 | EP0267140A2 Compensator for earth boring bits |
| 05/11/1988 | EP0266864A2 Cutting tool for cutting well casing |