| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 01/15/1992 | EP0465946A1 Hard metal or ceramic bar, method and extrusion-die for its production |
| 01/15/1992 | EP0465685A1 Drilling head of a horizontal drilling machine |
| 01/14/1992 | USRE33793 Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein |
| 01/14/1992 | US5080183 Seal assembly for roller cutter drill bit having a pressure balanced lubrication system |
| 01/08/1992 | EP0464600A2 Ram-tape core-taking apparatus for earth formations |
| 01/08/1992 | CN2092595U Bits for rock hole-expending |
| 01/07/1992 | US5078219 Concave drag bit cutter device and method |
| 01/07/1992 | CA1293970C Earth boring bit with pin mounted compensator |
| 01/02/1992 | DE4020242A1 Electric wall socket aperture drilling device - has diamond cutting crown around central drill bit and selective hammer drill operating mode |
| 12/31/1991 | US5076374 Drilling device with an impact-rotation tool |
| 12/29/1991 | CA2020080A1 Ice auger cutter |
| 12/27/1991 | EP0462955A1 Improved tools for cutting rock drilling |
| 12/24/1991 | US5074367 Rock bit with improved shank protection |
| 12/24/1991 | US5074356 Milling tool and combined stabilizer |
| 12/24/1991 | US5074355 Section mill with multiple cutting blades |
| 12/18/1991 | EP0462091A1 Improved tools for percussive and rotary crushing rock drilling provided with a diamond layer |
| 12/18/1991 | EP0461951A1 Abrasive cutting element and process to manufacture such an element |
| 12/18/1991 | CN1057087A 金刚石钎头 Diamond drill bits |
| 12/18/1991 | CN1057086A Integral diamond drill rod |
| 12/17/1991 | US5072796 Boring bit |
| 12/17/1991 | US5072795 In a roller cutter drill bit |
| 12/17/1991 | CA1293246C Cemented carbide tool |
| 12/17/1991 | CA1293245C Butterfly-type shim having semi-opened bottom and double sandwich braze joint produced therewith |
| 12/17/1991 | CA1293207C Apparatus for correcting irregularities in or enlarging an underground duct |
| 12/12/1991 | WO1991019074A1 Drill head with nozzles |
| 12/12/1991 | CA2064010A1 Drill head with nozzles |
| 12/11/1991 | EP0460306A1 Fabricating fracture-resistant diamond and diamond composite articles |
| 12/10/1991 | US5070952 Downhole milling tool and cutter therefor |
| 12/10/1991 | US5070951 Drill for water wells |
| 12/04/1991 | EP0459610A2 Milling tool for well casings |
| 12/03/1991 | USRE33757 Diamond drill bit with varied cutting elements |
| 12/03/1991 | US5069584 Hollow drilling tool |
| 11/28/1991 | DE4016965A1 Drilling head for tunnel boring - has central channel with nozzles directed to front and rear |
| 11/27/1991 | EP0457791A1 Device for taking soil samples. |
| 11/27/1991 | EP0382774B1 Improvement to the method of compaction-reinforcement-injection or decompaction-draining of grounds by means of auxiliary tubes |
| 11/27/1991 | CN1056553A Method and apparatus for drilling and coring |
| 11/26/1991 | US5067826 Ball and roller bearings and bearing components |
| 11/26/1991 | US5067571 Auger planter |
| 11/26/1991 | CA1292464C Radially stabilized drill bit |
| 11/21/1991 | EP0456994A1 Drill shaft for boring the taphole of a blast furnace |
| 11/21/1991 | DE4027289A1 Blast furnace tap-hole drill rod |
| 11/19/1991 | US5065827 Hammer bit retention tool |
| 11/19/1991 | CA1292221C Volume and pressure balanced rigid face seal for rock bits |
| 11/19/1991 | CA1292220C Earth boring bit with two piece bearing and rigid face seal assembly |
| 11/14/1991 | WO1991017339A1 Method and apparatus for drilling and coring |
| 11/14/1991 | DE4018735A1 Soil specimen extraction arrangement - has hollow tube mounted on jib attached to rail linked to tractor hydraulic mechanism |
| 11/14/1991 | DE4014538A1 Nail used as spreader for plastic dowel - has cross=section with at least one edge and has head fitted into suitable hammer tool so that it can also be used to produce hole in wall |
| 11/13/1991 | EP0455994A2 Eccentric drive for radially oscillating rollers, rolling cutters and milling drilling tools |
| 11/13/1991 | CN2088592U Pneumatic drill bit with electronic counter |
| 11/12/1991 | US5064007 Drilling a well bore |
| 11/05/1991 | US5062865 Chemically bonded superabrasive grit |
| 10/31/1991 | WO1991016521A1 Percussive drilling arrangement |
| 10/30/1991 | EP0453839A2 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 10/30/1991 | CN1055792A Through type in the hole drill reversing circulation core bit |
| 10/30/1991 | CN1055771A Low melting point copper-manganese-zine alloy for infiltration binder in matrix body rock drill bits |
| 10/29/1991 | US5061293 Cutting intermediate structure into two pieces for more efficient use thereof |
| 10/29/1991 | US5060739 Cutter assemblies for rotary drill bits, and method of manufacturing same |
| 10/29/1991 | US5060738 Three-blade underreamer |
| 10/29/1991 | US5060736 Steerable tool underreaming system |
| 10/27/1991 | CA2039660A1 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 10/24/1991 | DE4012772A1 Hammer drill bit - has cruciform cutters with notches in two opposite ones |
| 10/24/1991 | DE3941609C1 Boring head for mining - has head and shaft provided with fluid flushing channels and tapering surface on head |
| 10/23/1991 | EP0453428A1 Method of making cemented carbide body for tools and wear parts |
| 10/23/1991 | EP0453426A1 Diamond rock tools for percussive and rotary crushing rock drilling |
| 10/23/1991 | EP0452999A2 A rotating bit with junk slots in its gage |
| 10/23/1991 | EP0452584A1 Nozzle means for rotary drill bits |
| 10/22/1991 | US5058690 Rock working tool |
| 10/22/1991 | US5058689 Wear protective means for a drilling tool |
| 10/22/1991 | US5058666 Cutting tool for removing materials from well bore |
| 10/20/1991 | CA2040589A1 Diamond rock tools for percussive and rotary crushing rock drilling |
| 10/17/1991 | DE4012222A1 Deep boring drill assembly - has quick tool-changing mechanism to substitute roller chisels and fixed chisels |
| 10/16/1991 | EP0452255A2 Stone drill bit |
| 10/16/1991 | EP0452058A2 Insert attack angle for roller cone rock bits |
| 10/16/1991 | CN1014306B Low pressure bonding of pcd bodies and method |
| 10/15/1991 | US5056610 Shale diverting means for a sealed bearing drill bit |
| 10/15/1991 | US5056382 Matrix diamond drag bit with PCD cylindrical cutters |
| 10/15/1991 | US5056242 Underground wall construction method and apparatus |
| 10/08/1991 | US5054246 Abrasive compacts |
| 10/07/1991 | WO1991015653A1 Ring clamp for a cutter ring in a tunnel drilling machine |
| 10/02/1991 | EP0449547A2 Abrasive product |
| 10/02/1991 | EP0449416A2 Rotary drill bit with outwardly directed nozzles |
| 10/02/1991 | EP0449415A2 Outwardly mounted nozzles for rotary drill bits |
| 10/02/1991 | CN2085850U Hard-metals sliding-bearing roller-bit |
| 10/01/1991 | US5052503 Eccentric drilling tool |
| 09/27/1991 | CA2038661A1 Abrasive product |
| 09/25/1991 | EP0447679A2 Anti-balling earth boring bit |
| 09/24/1991 | US5051112 Rods made by mixing particles of tungsten carbide, particles of a metal binders, pressing by extrusion to form rods, heat treatment |
| 09/24/1991 | CA1289553C Drag drill bit having improved flow of drilling fluid |
| 09/22/1991 | CA2033548A1 Anti-balling cutting structure |
| 09/18/1991 | EP0447016A1 Means for mounting a roller cutter on a drill bit |
| 09/18/1991 | EP0446765A1 Drill bit cutting array having discontinuities therein |
| 09/18/1991 | CN2084976U Cut dill for opening window on drivepipe |
| 09/11/1991 | EP0445389A1 Cobalt bonded diamond tools, process for preparing the same and their use |
| 09/10/1991 | US5047401 Use of dipeptide alkyl esters to treat GVHD |
| 09/10/1991 | CA1288763C Compensator for earth boring bits |
| 09/07/1991 | CA2037480A1 Drill bit cutting array having discontinuities therein |
| 09/04/1991 | EP0444682A1 Excavation tool |
| 09/03/1991 | US5045092 Hardness, wear resistance |
| 09/03/1991 | CA1288416C Cutting element with wear resistant crown |
| 08/29/1991 | WO1991013225A1 Apparatus and method for building a foundation for uprights or for making passages therethrough |