| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 04/17/1984 | CA1165756A1 Arrangement for full hole drilling |
| 03/20/1984 | CA1163985A1 Vibratory drill apparatus |
| 03/13/1984 | CA1163624A1 Downhole core barrel flushing system |
| 02/14/1984 | US4431225 Releasing device in core barrel grapplers |
| 01/31/1984 | US4428602 Inner tube element for a double tube coring apparatus and process for the manufacture of this tube element |
| 12/06/1983 | US4419314 Bore holes, epoxy resin coating |
| 12/06/1983 | US4418770 Process for retrieving a coring barrel comprising two tubes and retrieving device for such a process |
| 12/06/1983 | CA1158227A1 Method and apparatus for recovering unstable cores |
| 09/13/1983 | CA1153759A1 Drilling device for drilling a core in deep drill holes |
| 06/28/1983 | US4389792 Drill core inclinometer |
| 05/17/1983 | US4383583 Soil sampling tool |
| 03/15/1983 | US4376392 Viscous sludge sample collector |
| 02/01/1983 | US4371045 Method and apparatus for recovering unstable cores |
| 01/11/1983 | CA1139297A1 Turbo-coring device equipped with a following pipe |
| 12/21/1982 | CA1137970A1 Process and means for assessing the position and angularity of a core drill |
| 11/02/1982 | US4356872 Downhole core barrel flushing system |
| 10/27/1982 | EP0063188A1 Apparatus and method for obtaining a core at in situ pressure |
| 10/26/1982 | CA1134343A1 Earth boring auger |
| 08/24/1982 | US4345461 Apparatus for taking bedrock samples from bottom of deep-water basins |
| 08/10/1982 | US4343370 Turbo-coring device equipped with a following pipe |
| 08/04/1982 | EP0056930A1 Synthetic resin inner tube element for a double tube core barrel, and method of making said tube |
| 07/27/1982 | CA1128493A1 Knuckel joint spearhead core drilling apparatus |
| 07/06/1982 | CA1126982A1 Bumper mounted soil sampling device |
| 06/29/1982 | US4336849 Earth drilling device for extracting earth samples |
| 06/15/1982 | US4334429 Method and apparatus for locating the position of a drill core sample |
| 06/08/1982 | US4333541 Bumper mounted soil sampling device |
| 06/02/1982 | EP0052672A1 Method for recovering a retrievable core receiver in upward drilling and a recovery head for this purpose |
| 05/11/1982 | CA1123420A1 Carottier double |
| 04/21/1982 | EP0050104A2 A device in core barrels |
| 04/14/1982 | EP0049698A2 Releasing device in core barrel grapplers |
| 03/16/1982 | CA1120027A1 Pressure core barrel flushing system |
| 03/09/1982 | CA1119510A1 Pressure core barrel |
| 03/02/1982 | US4317490 Apparatus and method for obtaining a core at in situ pressure |
| 01/26/1982 | US4312414 Method and apparatus for obtaining saturation data from subterranean formations |
| 01/19/1982 | US4311201 Core sample orientation tool |
| 01/12/1982 | CA1115982A1 Tubular drive in mineral sampler |
| 11/17/1981 | US4300643 Double core barrel |
| 11/17/1981 | CA1112557A1 Sampler and measurement apparatus |
| 10/27/1981 | US4296822 Multipurpose fluid flow assisted downhole tool |
| 08/18/1981 | US4284150 Soil sampling device |
| 08/04/1981 | US4281725 Knuckle joint spearhead core drilling apparatus |
| 07/21/1981 | US4279315 Apparatus for extracting cores |
| 07/07/1981 | US4276778 Anaerobic sampling method |
| 06/16/1981 | US4272987 Pressure core barrel flushing system |
| 04/07/1981 | US4260020 Method and tool for controlling fluid flow from a tubing string into a low pressure earth formation |
| 03/31/1981 | US4258803 Core barrel for obtaining and retrieving subterranean formation samples |
| 03/24/1981 | CA1098109A1 Method of and apparatus for recovery of cores from soft and unconsolidated earth materials |
| 03/17/1981 | US4256192 Pressure core barrel |
| 03/10/1981 | US4254832 Sampler and measurement apparatus |
| 03/10/1981 | CA1097328A1 Method and core barrel apparatus for obtaining and retrieving subterranean formation samples |
| 02/03/1981 | US4248313 Earth boring auger |
| 11/18/1980 | US4234046 Pressure differential seafloor corer-carrier |
| 10/28/1980 | US4230192 Core sampling apparatus and method |
| 07/10/1980 | WO1980001413A1 Device for taking samples of bed-rocks from bottom of deep-water reservoirs |
| 04/15/1980 | CA1075491A1 Device for taking bottom soil samples from deep water basins |
| 03/04/1980 | US4191263 Peat sampling probe |
| 02/12/1980 | US4187919 Cable-type core barrel |
| 10/16/1979 | CA1064467A1 Method and apparatus for thin-walled tube sampling of soils |
| 09/25/1979 | CA1063093A1 Drill crown coupling |
| 05/29/1979 | US4156471 Rubble and core removal apparatus |
| 05/29/1979 | US4156469 Method of and apparatus for recovery of cores from soft and unconsolidated earth materials |
| 03/27/1979 | CA1051416A1 Core and cuttings automatic recovery system |
| 03/13/1979 | US4143720 Method and apparatus for taking core samples |
| 03/06/1979 | US4142594 Method and core barrel apparatus for obtaining and retrieving subterranean formation samples |
| 12/19/1978 | US4130170 Probe for use in geological surveys |
| 12/05/1978 | US4128134 Method and apparatus for determining the orientation of a core cut in a bore hole |
| 11/07/1978 | CA1041989A1 Apparatus for providing a packaged core |
| 10/03/1978 | US4117896 Soil sampler |
| 09/26/1978 | US4116069 Device for taking bottom soil samples from deep water basins |
| 09/05/1978 | CA1037797A1 Sampling airhammer apparatus |
| 08/15/1978 | US4106576 Sampling tube cleaning device |
| 07/25/1978 | US4102417 Core cut off cable |
| 07/04/1978 | US4098698 Compressed air, decompression |
| 07/04/1978 | US4098361 Drilling head connection for use in a reverse circulation system |
| 07/04/1978 | US4098360 Soil sample core extraction tool |
| 03/28/1978 | US4081040 Method and apparatus for thin-walled tube sampling of soils |
| 01/31/1978 | US4071099 Method and apparatus for stabilizing borehole cores |
| 01/03/1978 | US4066138 Earth boring apparatus employing high powered laser |
| 11/22/1977 | US4059155 Junk basket and method of removing foreign material from a well |
| 08/02/1977 | US4038875 Cryogenic sediment sampler |
| 03/29/1977 | US4014393 Core receiver and method of use thereof |
| 01/11/1977 | US4002213 Down-the-hole motor for rotary drill rod and process for drilling using the same |
| 12/21/1976 | US3998281 Earth boring method employing high powered laser and alternate fluid pulses |
| 11/16/1976 | US3991834 Sampling airhammer apparatus |
| 11/09/1976 | US3990524 Down-the-hole motor for rotary drill rod and process for drilling using the same |
| 10/19/1976 | US3986555 Apparatus for providing a packaged core |
| 10/19/1976 | US3986536 Grout injecting apparatus |
| 09/07/1976 | US3978932 Apparatus and method for obtaining undisturbed soil core samples |
| 09/07/1976 | US3978733 Sampler for extracting core samples |
| 08/31/1976 | US3977482 Wire line core barrel assembly |
| 07/20/1976 | US3970335 Dual concentric pipes |
| 07/20/1976 | US3970156 Water weighted corer |
| 06/22/1976 | US3964555 Apparatus for obtaining earth cores |
| 04/27/1976 | US3952817 Basket type core retainer |
| 04/20/1976 | US3951219 Drill tool comprising a core barrel and a removable central portion |
| 04/13/1976 | US3949819 Soil sampling device |
| 04/06/1976 | US3948588 Swivel for core drilling |
| 04/06/1976 | US3948058 Device for soil sampling under water |
| 03/02/1976 | US3941196 Percussive air hammer and core bit apparatus |
| 01/27/1976 | US3934662 Core bit |