| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 03/27/1990 | US4911001 Core surface washer |
| 03/13/1990 | US4907659 Powered soil-sampler |
| 03/07/1990 | EP0356657A2 Apparatus for taking core samples |
| 02/21/1990 | CN2053237U Core extractor |
| 02/14/1990 | CN2052811U Sampler for concrete core sample |
| 02/01/1990 | DE3902870A1 Method of sinking bores in subterranean rock formations |
| 01/31/1990 | EP0352979A2 Variable amplitude drill |
| 01/31/1990 | EP0352427A2 Drilling device |
| 01/25/1990 | WO1990000666A1 Device for steering the direction of drilling |
| 01/09/1990 | CA1264316A1 Wire line core barrel |
| 12/28/1989 | DE3820924A1 Soil sample removal probe |
| 12/19/1989 | US4887676 Device for closing a core barrel installed in a drilling rig |
| 12/14/1989 | WO1989012220A1 Sampler |
| 12/14/1989 | DE3918132A1 Device for securing a tool inside a pipe sunk in the ground |
| 12/05/1989 | US4884638 Soil coring device with a core ejector mechanism |
| 11/28/1989 | US4883131 Core orientation system |
| 11/15/1989 | CN2047712U Completely-sealed corer |
| 11/07/1989 | US4878549 Wire line core barrel |
| 10/26/1989 | DE3812917A1 Slotted tubular drill for earth, etc. |
| 10/25/1989 | EP0338367A2 Core-drilling tool |
| 10/24/1989 | US4875531 Core drilling tool with direct drive |
| 09/26/1989 | CA1261053A1 Core monitoring device |
| 09/26/1989 | CA1259982A1 Combination soil auger and soil core sampler with sample retaining capacity |
| 08/16/1989 | EP0327667A2 Method and device for taking soil samples |
| 08/16/1989 | EP0327598A1 Fusion-drilling process. |
| 08/08/1989 | US4854396 Pivoting cutter for ice coring auger |
| 08/08/1989 | US4854163 Beltless core conveyor system for wellsite analysis |
| 07/18/1989 | US4848487 Method for minimizing mud solids invasion of core samples obtained during subsurface coring |
| 07/18/1989 | US4848484 Soil sample extraction tool |
| 06/29/1989 | DE3743416A1 Method and device for taking soil samples |
| 06/07/1989 | CN2038949U Deposited residual magnetism type core director |
| 06/06/1989 | US4836299 Sonic method and apparatus for installing monitor wells for the surveillance and control of earth contamination |
| 05/30/1989 | US4834198 Positive latch wire line core barrel apparatus |
| 05/24/1989 | EP0174972B1 Hammer for use in a bore hole and apparatus for use therewith |
| 05/23/1989 | US4832138 Device to control the locking of a boring corer |
| 05/18/1989 | DE3736458A1 Method and device for making an earth bore |
| 05/02/1989 | US4825963 High-pressure waterjet/abrasive particle-jet coring method and apparatus |
| 04/26/1989 | CN1032590A Beltless core conveyor system for wellsite analysis |
| 04/25/1989 | CA1253137A1 Hydraulic lift inner barrel in a drill string coring tool |
| 04/20/1989 | DE3729138A1 Method and drilling rig for producing underground transverse bores, in particular horizontal core bores for obtaining soil samples, from the surface |
| 04/19/1989 | CN2036204U Valveless void core taking multipurpose hole hammer |
| 04/05/1989 | EP0310303A1 Beltless core conveyor system for wellsite analysis |
| 04/05/1989 | CN1003792B Special non-solid-state washings for drill sampling in friable and broken stratum |
| 03/22/1989 | EP0308083A2 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/07/1989 | US4809790 Device for sampling soils and retaining volatiles therein and method of using same |
| 03/01/1989 | EP0305178A1 Improvements in or relating to soil sampling |
| 03/01/1989 | CN2033440U Rotation and plug-in type soil picker |
| 02/22/1989 | CN2033050U Multipoint orienting system for orienting core-catching device |
| 01/31/1989 | US4800969 Fast descent core barrel apparatus |
| 01/24/1989 | CA1249261A1 Corebarrel |
| 12/15/1988 | WO1988009863A1 A device for geotechnical or geological sampling |
| 12/14/1988 | CN87202520U Claw type single-side corer |
| 12/13/1988 | US4790392 Soil sample core extraction tool |
| 11/30/1988 | EP0293355A1 Device to control the bolting of a core drilling machine |
| 11/29/1988 | US4787983 Extraction with cycloalkanes, ethers, or freons" |
| 11/22/1988 | US4785661 Method for analyzing solvent extracted sponge core |
| 10/19/1988 | EP0287548A1 Apparatus for shutting off a core-barrel mounted on a drill string |
| 09/29/1988 | DE3707589A1 Manually actuable drill rod for the extraction of soil samples |
| 09/27/1988 | US4773489 Core drilling tool for boreholes in rock |
| 09/21/1988 | EP0232268B1 Device for controlling the locking of a sampling tube |
| 09/20/1988 | US4771634 Solvent disperser for removing oil from sponge core |
| 09/14/1988 | CN87205294U Sampling driller with back sticky wall valve |
| 09/13/1988 | US4770030 Soil penetration and sampling system |
| 08/23/1988 | US4765414 Corebarrel |
| 08/23/1988 | CA1240981A1 Adjustable bearing section core barrel |
| 08/23/1988 | CA1240980A1 Self-activating, positively driven concealed core catcher |
| 08/17/1988 | CN87213653U Multi-function core extractor |
| 08/16/1988 | US4763735 Mobile machine for making holes in putting greens |
| 08/03/1988 | EP0276724A2 Core drilling tool with a direct drive |
| 07/28/1988 | WO1988005491A1 Fusion-drilling process |
| 07/26/1988 | US4759214 Method for determining fracture toughness of rock by core boring |
| 07/14/1988 | DE3644723A1 Method and apparatus for recovering the inner pipe of a core-drilling appliance |
| 06/23/1988 | DE3737024A1 Drilling device, in particular for core holes |
| 06/14/1988 | US4750570 Formation sampling bullet and cables therefor |
| 06/14/1988 | CA1238035A1 Hammer for use in a bore hole and apparatus for use therewith |
| 06/07/1988 | CA1237653A1 Method and apparatus for preventing contamination of a coring sponge |
| 05/18/1988 | CN86106661A Functional mechanisms of a drilling tool for core-taking with rope |
| 04/06/1988 | EP0262133A1 Arrangement for a soil sampler |
| 04/06/1988 | CN86102084B Force-moment-enhanced pneumatic grabbing bucket |
| 04/05/1988 | US4735269 Core monitoring device with pressurized inner barrel |
| 03/16/1988 | CN86209975U Multi-point directional core sampling device for broken terrain |
| 03/09/1988 | CN86102973A Reversely-fitted circlip type self-controlling on and off long cylinder engineering geological soft soil-grit sampler |
| 03/08/1988 | US4729437 Sediment sampler |
| 03/02/1988 | CN87204269U Pulling unit of sand drilling bed rock |
| 02/16/1988 | CA1232777A1 Perforated end plug plate for testing core samples |
| 02/02/1988 | CA1232264A1 Continuous, undisturbed sampling of hard bottom till by means of a rotating core drill |
| 01/27/1988 | EP0254216A2 Method and apparatus for coring with a core barrel sponge |
| 01/27/1988 | CN87201312U Drilling-out machine for concrete core |
| 01/20/1988 | EP0253473A2 Core barrel for obtaining oriented cores |
| 01/13/1988 | CN87201797U Multifunction core-fetcher |
| 01/06/1988 | CN86104172A Reverse cycle continuous centrodrilling impactor and capper |
| 01/05/1988 | US4716974 Method and apparatus for coring with an in situ core barrel sponge |
| 12/23/1987 | EP0250059A2 Method for determining fracture toughness of rock by core boring |
| 12/09/1987 | EP0248615A2 Improvements in drilling apparatus |
| 12/09/1987 | CN86201884U Pressure ballancing device for sealed core extracting of drilling well |
| 12/01/1987 | US4709584 Device for taking samples of bottom sediments from water basins |
| 11/10/1987 | US4705118 Hammer for use in a bore hole and apparatus for use therewith |
| 10/28/1987 | EP0242728A2 Coring tool for rock drilling |
| 10/21/1987 | EP0241750A2 Combination soil auger and soil core sampler with sample retaining capacity |
| 10/08/1987 | DE3611014A1 Core drill |