| Patents for E21B 10 - Drill bits (19,464) |
|---|
| 02/10/1981 | CA1095501A1 Flow control valve for rock bits |
| 02/03/1981 | US4248485 Earth boring bit with textured bearing surface |
| 02/03/1981 | US4248484 Pressure venting O-ring bearing seal for rock bits |
| 02/03/1981 | US4248314 Shaft drill bit with overlapping cutter arrangement |
| 02/03/1981 | US4248313 Earth boring auger |
| 02/03/1981 | US4248312 Method and apparatus for upwardly cutting full cutting face of a shaft without requesting workmen's hands |
| 02/03/1981 | CA1095024A1 Rolling cutter drill bit |
| 01/28/1981 | EP0023198A1 Process for the manufacture of a stone-working tool |
| 01/28/1981 | EP0022822A1 Roller cutter |
| 01/27/1981 | US4246977 Diamond studded insert drag bit with strategically located hydraulic passages for mud motors |
| 01/22/1981 | WO1981000131A1 A drag bit for rotary rock drilling |
| 01/20/1981 | US4245710 Centrifugal water-air separation in earth drilling bits |
| 01/20/1981 | US4245708 Blade stabilizer provided with at least one fluid passage having a venturi effect, in particular for use in combination with a drill bit |
| 01/20/1981 | CA1094049A1 Drill bit for rock drilling |
| 01/20/1981 | CA1094048A1 Suction jet drilling tool |
| 01/13/1981 | US4244521 Arrangement for discharging liquid medium under high pressure |
| 01/13/1981 | US4244432 Earth-boring drill bits |
| 01/13/1981 | US4244431 Drilling apparatus with dual drill pipe and cross-over |
| 01/13/1981 | US4244430 Earth boring bit packed lubrication system |
| 01/06/1981 | US4243113 Drilling head of a rotary impact drill |
| 01/06/1981 | US4243112 Vibrator-assisted well and mineral exploratory drilling, and drilling apparatus |
| 01/06/1981 | CA1093066A1 Percussion rock bit |
| 01/06/1981 | CA1093065A1 Earth boring drill bit with snap ring cutter retention |
| 01/06/1981 | CA1093064A1 Combined stabilizer and reamer for drilling well bores |
| 01/06/1981 | CA1093063A1 Reamer stabilizer for rock drills |
| 12/30/1980 | US4241800 Cutting tool for a pneumatic hammer |
| 12/30/1980 | US4241799 Protected cutter mounting for drill bits |
| 12/30/1980 | US4241798 Drilling bits for plastic formations |
| 12/30/1980 | CA1092595A1 Mining drill bit |
| 12/30/1980 | CA1092594A1 Drill bit insert |
| 12/30/1980 | CA1092593A1 Rotary drilling bit for deephole drilling and method of manufacturing the same |
| 12/24/1980 | WO1980002858A1 Deep hole rock drill bit |
| 12/23/1980 | US4240674 Positive lubricating and indexing bearing assembly |
| 12/23/1980 | US4240513 Drill bit with suction jet means |
| 12/23/1980 | CA1092092A1 Earth boring drill bit with snap ring cutter retention |
| 12/23/1980 | CA1092091A1 Device for boring |
| 12/16/1980 | US4239502 Semiconductor heat sinks, tools |
| 12/16/1980 | US4239087 Drill bit with suction jet means |
| 12/09/1980 | CA1091220A1 Bore tool with jet exhauster |
| 12/02/1980 | US4236764 Earth boring drill bit with snap ring cutter retention |
| 12/02/1980 | CA1090775A1 Rotary drill bit with rotary cutter |
| 11/25/1980 | US4235480 Seal ring for drill bit assemblies |
| 11/25/1980 | US4235295 Earth boring bit with renewable bearing surface |
| 11/25/1980 | CA1090328A1 Sealing system for an earth boring cutter |
| 11/25/1980 | CA1090327A1 Rock boring cutter with replaceable cutting element |
| 11/25/1980 | CA1090138A1 Grinding fixture |
| 11/18/1980 | US4234235 Rotary cutterhead for an earth boring machine |
| 11/18/1980 | US4234048 Drill bits embodying impregnated segments |
| 11/12/1980 | EP0018394A1 Rotary rock drill bit. |
| 11/11/1980 | US4232912 Earth boring bit with gridded ferrous bearing surface |
| 11/11/1980 | CA1089439A1 Skewed inserts for an earth boring cutter |
| 11/04/1980 | US4231438 Straight hole insert drill bit |
| 11/04/1980 | US4231437 Combined stabilizer and reamer for drilling well bores |
| 10/28/1980 | US4230194 Rotary drill bit |
| 10/28/1980 | US4230193 Rotary drill bit |
| 10/28/1980 | US4230191 Machine for making underground excavations |
| 10/21/1980 | US4229638 Unitized rotary rock bit |
| 10/21/1980 | US4228862 Apparatus for drilling holes in the ground |
| 10/15/1980 | EP0017518A1 Rotary drilling machine and drilling method using this machine |
| 10/14/1980 | US4227586 Roller reamer apparatus |
| 10/14/1980 | CA1087640A1 Surface drilling apparatus |
| 10/14/1980 | CA1087604A1 Rock drill bit |
| 10/07/1980 | US4226291 Reamer stabilizer for rock drills |
| 10/07/1980 | CA1087165A1 Means for drilling |
| 10/07/1980 | CA1087163A1 Rotary roller bit with improved seal means |
| 10/07/1980 | CA1086994A1 Combination drilling and wrenching tool |
| 10/02/1980 | WO1980002037A1 Rotary drill bit |
| 09/30/1980 | US4225322 Composite compact components fabricated with high temperature brazing filler metal and method for making same |
| 09/23/1980 | US4224380 Temperature resistant abrasive compact and method for making same |
| 09/23/1980 | US4223749 Rotary earth boring drill bit with centrifugal foreign particle barrier device |
| 09/23/1980 | CA1086299A1 Rotary drilling bit |
| 09/16/1980 | US4222447 Drill bit with suction jets |
| 09/09/1980 | US4221270 Drag bit |
| 09/09/1980 | CA1085381A1 Rolling cutter drill bit with improved journal configuration |
| 09/09/1980 | CA1085380A1 Rock bit with diamond reamer to maintain gage |
| 09/09/1980 | CA1085379A1 Nozzle placement in large diameter earth boring bits |
| 09/09/1980 | CA1085376A1 Fluid operated undercutter |
| 09/04/1980 | WO1980001832A1 Pressure shaft seal and method |
| 09/02/1980 | US4220377 Earth boring bit with eccentrically machined bearing pin |
| 08/26/1980 | US4219087 Enlarged bore hole drilling method |
| 08/19/1980 | US4217966 Junk basket, bit and reamer stabilizer |
| 08/07/1980 | WO1980001587A1 Rotary cutterhead for an earth boring machine |
| 08/07/1980 | WO1980001530A1 Impact tip for impact rock breaker |
| 08/05/1980 | CA1083135A1 Two stage large diameter drill bit |
| 08/05/1980 | CA1083134A1 Means and method of forming and enlarging holes in soil |
| 07/29/1980 | US4214764 Axial-type sealing device arranged to provide the seal between a stationary and a rotatable element |
| 07/29/1980 | CA1082685A1 Drilling bit with a single cutting head |
| 07/22/1980 | US4213656 Drilling bit |
| 07/22/1980 | CA1082169A1 Rock bit with specially shaped inserts |
| 07/15/1980 | CA1081686A1 Drill bit air clearing system |
| 07/15/1980 | CA1081685A1 Nutating drill bit |
| 07/10/1980 | WO1980001394A1 Roller cutter |
| 07/08/1980 | US4211508 Earth boring tool with improved inserts |
| 07/08/1980 | US4211453 Rock drill bit lubrication system |
| 07/08/1980 | US4211294 Nickel, manganese alloy |
| 07/08/1980 | CA1081206A1 Bearing means for rotary drill bits |
| 07/01/1980 | US4210270 Electronic monitoring of rock bit parameters |
| 07/01/1980 | US4210215 Rock drill with helical dust conveying groove |
| 07/01/1980 | US4209890 Method of making a rotary rock bit with seal recess washer |
| 07/01/1980 | CA1080690A1 Raise drill |