| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 05/11/1988 | DE3637456A1 Hollow drill bit |
| 05/11/1988 | CN87206853U Extended nozzle of roller bits |
| 05/10/1988 | US4743515 Cemented carbide body used preferably for rock drilling and mineral cutting |
| 05/10/1988 | US4743137 Tool having a hard metal part with a solder and lining type connection |
| 05/04/1988 | EP0265718A2 An improved bit design for a rotating bit incorporating synthetic polycrystalline cutters |
| 05/04/1988 | CN87104794A Gang drill construction |
| 05/03/1988 | US4741471 Method for manufacturing a rotary rock bit |
| 05/03/1988 | US4741406 Drill bit having offset roller cutters and improved nozzles |
| 05/03/1988 | CA1236084A1 Hardback bushing having a thin wall powder metal component |
| 05/03/1988 | CA1236083A1 Hammer drill bit and sub-assembly |
| 04/27/1988 | EP0265344A1 Method for producting a pile in the ground, drilling machine and device for carrying out such a method |
| 04/27/1988 | EP0264969A2 Replaceable tool sections for a downhole tool |
| 04/27/1988 | EP0264674A2 Low pressure bonding of PCD bodies and method |
| 04/27/1988 | EP0264657A1 Boring tool with an exchangeable delivery helix |
| 04/26/1988 | US4739845 Nozzle for rotary bit |
| 04/26/1988 | US4739844 Hammer drill bit and sub-assembly |
| 04/20/1988 | CN87212151U Underwater bottom pier expanding drill |
| 04/19/1988 | US4738323 Thrust bearing and cone locking assembly for rock drill bit |
| 04/19/1988 | US4738322 Polycrystalline diamond bearing system for a roller cone rock bit |
| 04/19/1988 | US4738320 Method and improvement to drilling tools allowing great efficiency in cleaning the cutting face |
| 04/14/1988 | DE3634440A1 Carbide-tipped percussion drill bit, in particular for down-the-hole hammer drills |
| 04/13/1988 | EP0263660A2 Cutting component |
| 04/12/1988 | US4736987 Rock cutting assembly |
| 04/12/1988 | US4736808 Percussive tool with high pressure fluid jet |
| 04/12/1988 | US4736805 Hydraulic breaker with high pressure water attachment |
| 04/12/1988 | CA1235113A1 Rotary drill bit |
| 04/12/1988 | CA1235112A1 Drill bit |
| 04/06/1988 | EP0263088A2 Rotary drilling tool with an expansible reamer |
| 03/29/1988 | US4733735 Rotary drill bits |
| 03/29/1988 | US4733734 Method and improvement to drilling tools comprising water passages providing great efficiency in cleaning the cutting face |
| 03/29/1988 | CA1234562A1 Replaceable bit nozzle |
| 03/29/1988 | CA1234561A1 Profiled body roller-reamer stabilizer |
| 03/23/1988 | CN87205082U Three teeth drill |
| 03/23/1988 | CN87201542U Head of hammer drill |
| 03/22/1988 | US4732222 Ram boring machine with impact blade piston |
| 03/16/1988 | EP0259872A2 Large compact rotary drill bit utilizing directed hydraulics for each cutter |
| 03/15/1988 | US4730682 Erosion resistant rock drill bit |
| 03/15/1988 | US4730681 Preventing wear-induced dislodgement |
| 03/15/1988 | CA1234096A1 Spherical bit |
| 03/15/1988 | CA1234094A1 Rotary drill bit |
| 03/08/1988 | US4729603 Round cutting tool for cutters |
| 03/08/1988 | US4729441 Rock drill |
| 03/08/1988 | US4729440 Transistion layer polycrystalline diamond bearing |
| 03/08/1988 | US4729439 For rock boring and the like |
| 03/02/1988 | EP0257944A2 Milling tool |
| 03/02/1988 | EP0257943A2 Apparatus having a radially movable member |
| 03/02/1988 | EP0257869A2 Cutting element with wear resistant crown |
| 03/02/1988 | CN87208194U Die for making bort bit |
| 03/02/1988 | CN87204269U Pulling unit of sand drilling bed rock |
| 03/01/1988 | US4727946 Rotary drill bits |
| 03/01/1988 | US4727945 Cutting element having diamond cutting blank reinforced by a shoulder |
| 03/01/1988 | US4727943 Rotary drill bit |
| 03/01/1988 | US4727942 Compensator for earth boring bits |
| 02/25/1988 | DE3726813A1 Bohrvorrichtung und schneidwerkzeug dafuer Drilling device and cutting tool for |
| 02/23/1988 | US4726718 Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disks |
| 02/23/1988 | US4726432 Method of manufacturing an earth boring drill bit |
| 02/23/1988 | CA1233168A1 Hybrid rock bit |
| 02/16/1988 | US4725512 Materials transformable from the nonamorphous to the amorphous state under frictional loadings |
| 02/16/1988 | US4725098 Erosion resistant cutting bit with hardfacing |
| 02/16/1988 | US4724913 Drill bit and improved cutting element |
| 02/11/1988 | WO1988001007A1 Enhanced circulation drill bit |
| 02/09/1988 | US4723612 Bit, nozzle, cutter combination |
| 02/03/1988 | EP0255499A2 Cutting element for a rotary drill bit and methods for making same |
| 02/03/1988 | CN87102597A Reaming shell and its cutting tool |
| 02/02/1988 | US4722615 Drilling apparatus and cutter therefor |
| 02/02/1988 | US4722405 Wear compensating rock bit insert |
| 02/02/1988 | US4722404 Drill bit bearing seal |
| 02/02/1988 | US4722402 Electromagnetic drilling apparatus and method |
| 02/02/1988 | CA1232266A1 Rolling cutters for drill bits, and processes to produce same |
| 01/27/1988 | CN85100562B Pulsed jet regulation device for high pressure spray nozzle |
| 01/26/1988 | CA1231938A1 Rock bit cutter cones having metallurgically bonded cutter inserts |
| 01/20/1988 | CN87202363U Drill crown of three wheels inserted teeth scraper |
| 01/19/1988 | US4720371 Rotary drill bits |
| 01/19/1988 | US4719979 Expendable diamond drag bit |
| 01/19/1988 | CA1231706A1 Drilling apparatus |
| 01/19/1988 | CA1231705A1 Diamond drill bit with varied cutting elements |
| 01/13/1988 | CN87201797U Multifunction core-fetcher |
| 01/12/1988 | US4718730 Cross-axis cutting assembly of a selective cutting machine |
| 01/12/1988 | US4718505 Rotary drill bits |
| 01/07/1988 | EP0251220A1 Drilling tool |
| 01/05/1988 | US4717290 Milling tool |
| 01/05/1988 | US4716977 Specially shaped cutting element for earth boring apparatus |
| 01/05/1988 | US4716976 Rotary percussion drill bit |
| 01/05/1988 | US4716975 Cutting element having a stud and cutting disk bonded thereto |
| 01/05/1988 | CA1231091A1 Chip relief for rock bits |
| 01/05/1988 | CA1230979A1 Rotary cutter for cable following apparatus |
| 12/30/1987 | CN87207985U Pneumatic down-hole impact drilling tool |
| 12/29/1987 | US4715455 Drill shoe |
| 12/29/1987 | CA1230762A1 Drill bit and cutter therefor |
| 12/22/1987 | US4714120 Diamond drill bit with co-joined cutters |
| 12/15/1987 | US4712626 Retainer device for drill bit |
| 12/15/1987 | CA1230325A1 Drill arrangement |
| 12/10/1987 | DE3619334A1 Hollow drill bit crown |
| 12/09/1987 | EP0248615A2 Improvements in drilling apparatus |
| 12/09/1987 | CN86210285U Staircase-shaped triangle polymorph drill with soft strut |
| 12/08/1987 | US4711609 Drill tool |
| 12/08/1987 | US4711312 Drill bit |
| 12/08/1987 | US4711311 Vibration and erosion resistant nozzle |
| 12/08/1987 | US4711309 Drilling apparatus |
| 12/08/1987 | US4711144 Drill bit and method of manufacture |