| Patents for E21B 4 - Drives for drilling, used in the borehole (6,032) |
|---|
| 10/19/1982 | US4354561 Reciprocating drill bit |
| 10/19/1982 | US4354558 Apparatus and method for drilling into the sidewall of a drill hole |
| 10/19/1982 | CA1133954A1 Method for drilling hard material |
| 09/21/1982 | US4350348 Sealing of telescopically related elements |
| 09/21/1982 | US4350204 Reamer |
| 09/07/1982 | CA1131210A1 Fluid operated rock drill hammer |
| 09/02/1982 | WO1982002922A1 Drilling method and apparatus |
| 08/31/1982 | CA1130779A1 Turbodrill |
| 08/24/1982 | US4345798 Reduction in wear of contacting surfaces |
| 08/10/1982 | US4343370 Turbo-coring device equipped with a following pipe |
| 08/03/1982 | CA1128926A1 Fluid operated rock drill hammer |
| 07/20/1982 | US4340334 Turbodrill with rubber rotor bearings |
| 07/13/1982 | US4339007 Progressing cavity motor governing system |
| 07/06/1982 | CA1127073A1 Apparatus for drilling into the sidewall of a drill hole |
| 07/06/1982 | CA1127027A1 Sealing of telescopically related elements |
| 06/08/1982 | US4333539 Method for extended straight line drilling from a curved borehole |
| 06/08/1982 | US4333537 Impact drilling tool having improved valving |
| 06/08/1982 | CA1125093A1 Bottom-hole multistart screw motor |
| 05/18/1982 | US4330155 Bore hole mining |
| 05/13/1982 | WO1982001569A1 Well jar |
| 05/11/1982 | US4329127 Sealed bearing means for in hole motors |
| 05/05/1982 | EP0050954A1 Boring tools |
| 04/27/1982 | US4326449 Double acting hydraulic jack with an end of stroke device |
| 04/20/1982 | CA1122200A2 Down hole well drilling tool |
| 04/13/1982 | US4324299 Downhole drilling motor with pressure balanced bearing seals |
| 04/06/1982 | US4323285 Dual thrust bearing for a shaft |
| 04/06/1982 | CA1121212A1 Stator for a downhole fluid operated motor and method of assembling the same |
| 04/01/1982 | WO1982001029A1 Improved bearing system for a downhle motor |
| 03/30/1982 | US4321974 Annular drilling hammer |
| 03/24/1982 | EP0048142A1 Fluid operated hammer |
| 03/24/1982 | EP0047944A1 Percussion tool |
| 03/23/1982 | US4320929 Sealed bearing system for hydraulically operated devices |
| 03/16/1982 | US4319784 Apparatus for water jet and impact drilling and mining |
| 03/09/1982 | CA1119582A1 Marine bearing for a downhole drilling apparatus |
| 03/09/1982 | CA1119581A1 Downhole drilling system |
| 03/02/1982 | US4317595 Chisel for a crust breaking facility |
| 03/02/1982 | US4317492 Method and apparatus for drilling horizontal holes in geological structures from a vertical bore |
| 02/09/1982 | US4314615 Self-propelled drilling head |
| 02/04/1982 | WO1982000315A1 Valve device |
| 02/02/1982 | US4313318 Adjustable kelly bushing for downhole drilling system |
| 01/26/1982 | US4312412 Fluid operated rock drill hammer |
| 01/19/1982 | US4311443 Motor/pump transmission construction for a Moineau type apparatus |
| 01/06/1982 | EP0043291A1 Improved fluid operated hammer |
| 01/05/1982 | US4308927 Well drilling tool |
| 12/29/1981 | US4307889 Apparatus utilizing rotary motion of a member as the motive force for a pump |
| 12/29/1981 | US4307786 Borehole angle control by gage corner removal effects from hydraulic fluid jet |
| 12/15/1981 | US4305474 Thrust actuated drill guidance device |
| 12/08/1981 | US4304309 Surface drilling apparatus |
| 12/08/1981 | CA1113919A1 Down-hole mud motor |
| 11/18/1981 | EP0040026A1 Free piston machines |
| 11/10/1981 | US4299398 Pressure compensating shaft seal |
| 11/10/1981 | US4299296 In-hole motor drill with bit clutch |
| 11/10/1981 | US4299295 Process for degasification of subterranean mineral deposits |
| 11/03/1981 | US4298077 Circulation valve for in-hole motors |
| 10/20/1981 | US4295535 In-hole motor drill with locking bit clutch |
| 10/20/1981 | US4295533 Pneumatically operated ram borer |
| 10/06/1981 | CA1110225A1 Rotating drill tool with impact device |
| 09/29/1981 | US4291773 Strictive material deflectable collar for use in borehole angle control |
| 09/29/1981 | US4291723 Fluid pressure actuated by-pass and relief valve |
| 09/15/1981 | US4289210 Impact drill bit actuator |
| 09/15/1981 | CA1109055A1 Sinker drill |
| 08/18/1981 | US4284149 Well drilling tool |
| 08/18/1981 | US4284147 Control device for the forward movement and rearward movement of pneumatic ram boring devices |
| 08/18/1981 | US4283991 Percussion mechanism |
| 08/04/1981 | US4281726 Drill string splined resilient tubular telescopic joint for balanced load drilling of deep holes |
| 08/04/1981 | US4281723 Control system for a drilling apparatus |
| 07/28/1981 | US4280570 Drill hammer |
| 07/28/1981 | US4280524 Apparatus and method for closing a failed open fluid pressure actuated relief valve |
| 07/21/1981 | US4279315 Apparatus for extracting cores |
| 07/14/1981 | US4278137 Apparatus for extracting minerals through a borehole |
| 07/14/1981 | US4278136 Sinkerdrill |
| 07/14/1981 | US4278135 Variable volume pneumatic drill |
| 07/07/1981 | US4276944 In-hole motor with bit clutch |
| 07/01/1981 | EP0030975A1 Hydraulic motor for a drill hole coring tool and method |
| 06/30/1981 | US4275795 Fluid pressure actuated by-pass and relief valve |
| 06/30/1981 | US4275794 Tool equipped with a percussive device |
| 06/23/1981 | US4274675 Shaft-sinking apparatus with milling head and central worm conveyor |
| 06/23/1981 | US4274497 Skirted hammer sub for dual tube drilling |
| 06/23/1981 | CA1103655A1 No translation available |
| 06/16/1981 | US4273201 Well drilling collars |
| 06/16/1981 | US4273193 Process for use in degasification of subterranean mineral deposits |
| 06/09/1981 | US4271915 Elastically vibratory longitudinal jacketed drill |
| 05/19/1981 | US4267893 Dual-rotating eccentric drilling apparatus and method |
| 05/15/1981 | EP0030975A4 Hydraulic motor for a drill hole coring tool and method. |
| 05/12/1981 | US4266619 Down hole cycloidal drill drive |
| 05/12/1981 | US4266465 Percussion mechanism |
| 05/05/1981 | US4265323 Direct bit drive for deep drilling tools |
| 04/28/1981 | US4264285 Downhole cleaner assembly for cleansing lubricant of downhole turbo-machines within wells |
| 04/28/1981 | US4263788 Universal joint apparatus having sliding plate construction for separating thrust and torque forces |
| 04/21/1981 | US4262758 Borehole angle control by gage corner removal from mechanical devices associated with drill bit and drill string |
| 04/14/1981 | US4261425 Mechanically nutating drill driven by orbiting mass oscillator |
| 04/07/1981 | US4260202 Bearing assembly |
| 04/07/1981 | US4260167 Well drilling tool |
| 04/07/1981 | US4260031 Solids diverter for a downhole drilling motor |
| 04/07/1981 | US4260030 Well tool |
| 03/31/1981 | US4258802 Downhole drilling system |
| 03/31/1981 | US4258801 Dump valve for use with downhole motor |
| 03/24/1981 | CA1098110A1 Reduction unit of drilling motor |
| 03/19/1981 | WO1981000736A1 Borehole drive for rock crushing instrument |
| 03/18/1981 | EP0025418A1 Chisel for a crust-breaking device and method of operating it |