| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 05/20/1992 | CN2104923U Reversely cycling continuous core bit withthrough submersible hole hammer |
| 05/13/1992 | CN2104285U Dual-moving water-stop single bit rope coring drill apparatus |
| 04/28/1992 | US5107942 Inner tube stabilizer for a corebarrel |
| 04/28/1992 | US5107936 Rock melting excavation process |
| 04/21/1992 | US5105894 Method and apparatus for orientating core sample and plug removed from sidewall of a borehole relative to a well and formations penetrated by the borehole |
| 04/07/1992 | US5101917 In-place soil sampler |
| 04/01/1992 | CN2100479U Closed coring tool |
| 03/19/1992 | WO1992002707A3 A core sampling device with indicator for jammed core |
| 03/11/1992 | CN1015809B Core plugging notifying mechanism of rope core drilling tool |
| 02/25/1992 | CA1296319C Directly driven coring tool |
| 02/20/1992 | WO1992002707A2 A core sampling device with indicator for jammed core |
| 02/19/1992 | EP0471659A1 Laser alignment system for well equipment |
| 02/19/1992 | CN2096629U Sealed diamond bit for taking core |
| 02/14/1992 | CA2048967A1 Laser alignment system for well equipment |
| 02/04/1992 | US5084980 Laser alignment system for well equipment |
| 01/28/1992 | US5083755 Face shock absorber for extracting core-collecting pipes |
| 01/22/1992 | EP0466702A1 Coupling for drilling machine with dust extractor. |
| 01/15/1992 | CN1057881A Sampling, making and information extracting of oil-bearing rock slice |
| 01/09/1992 | WO1991019075A3 Double-tube core drill for inclined drilling |
| 01/08/1992 | EP0464600A2 Ram-tape core-taking apparatus for earth formations |
| 12/31/1991 | US5076392 Method and apparatus for forcing a member through material such as soil and obtaining samples therefrom |
| 12/27/1991 | EP0462618A2 Method and apparatus for horizontal drilling |
| 12/24/1991 | US5074366 Method and apparatus for horizontal drilling |
| 12/22/1991 | CA2045059A1 Method and apparatus for horizontal drilling |
| 12/01/1991 | WO1991019075A2 Double-tube core drill for inclined drilling |
| 12/01/1991 | CA2083827A1 Double-tube core drill for inclined drilling |
| 11/27/1991 | EP0457791A1 Device for taking soil samples. |
| 11/14/1991 | DE4018735A1 Soil specimen extraction arrangement - has hollow tube mounted on jib attached to rail linked to tractor hydraulic mechanism |
| 10/30/1991 | CN1055792A Through type in the hole drill reversing circulation core bit |
| 10/21/1991 | CA2040217A1 Cockable corebreaker apparatus |
| 10/16/1991 | CN1014335B Drilling tool for core-taking with rope |
| 10/02/1991 | EP0448812A1 Apparatus and method for cutting a soil sample into slices |
| 10/01/1991 | US5052502 Apparatus for directional coring |
| 09/17/1991 | US5048619 Down-hole bearing assemblies |
| 09/11/1991 | CN2084510U Air back circulation continuously core taking drill |
| 09/11/1991 | CN2084509U Multifunctional valve lever drill sampler |
| 08/22/1991 | CA2036666A1 Soil recoring device |
| 08/21/1991 | CN2083189U Sampler of underwater undisturbed silt |
| 08/13/1991 | US5038873 Drilling tool with retractable pilot drilling unit |
| 08/13/1991 | US5038624 Soil recoring device |
| 07/16/1991 | US5031708 Cockable corebreaker apparatus |
| 07/10/1991 | EP0436046A1 Shock absorbing means for a core drillstring at the drilling site |
| 07/09/1991 | US5029653 Sinking drill holes in underground rock |
| 07/02/1991 | CA1285550C Core drilling tool for boreholes in rock |
| 06/25/1991 | US5025872 Core barrel adjusting system |
| 06/05/1991 | CN1012756B Beltless core conveyer system for wellsite analysis |
| 05/23/1991 | DE4000677A1 Geraet zur entnahme von bodenproben Geraet to earth sample |
| 04/30/1991 | US5010765 Method of monitoring core sampling during borehole drilling |
| 04/09/1991 | US5005433 Asbestos sample removal tool |
| 03/07/1991 | DE3928619A1 Directional drilling rig has drill rod inside drill pipe - with drill bit at angle to drill pipe axis and driven independently or simultaneously with drill pipe |
| 03/05/1991 | US4996887 Device for taking samples of bottom sediments and bottom water from water basins |
| 02/27/1991 | CN1049542A Rope core drilling tool |
| 02/27/1991 | CN1049541A Rope core drilling tool |
| 02/13/1991 | CN1049212A Pneumatic recycle back full-scale drilling debris sampler |
| 02/05/1991 | US4989678 Soil sampling kit and a method of sampling therewith |
| 02/05/1991 | CA1279864C Method for determining the amount of oil in a sponge core |
| 01/30/1991 | CN2070352U Converter capable of wantonly setting/taking sampling tool for well |
| 01/01/1991 | US4981183 Apparatus for taking core samples |
| 12/27/1990 | EP0403699A1 Method and apparatus for measurement of in-situ horizontal stress of non-coherent soil |
| 12/19/1990 | CN2067749U Drilling core extractor |
| 12/13/1990 | DE3918799A1 Core drilling in rock and ice - uses hydraulic breaker flat jacks as side cutters to enlarge boreholes and to remove debris |
| 12/05/1990 | CN2066889U Coring drill using oil or electricity |
| 12/05/1990 | CN2066887U Geology drill bit |
| 12/04/1990 | US4974691 Down-hole bearing assemblies |
| 12/04/1990 | US4974682 For use on golf course greens |
| 11/22/1990 | DE3915768A1 Extracting soil specimen from covering of deposit - ramming hollow core tube through all layers of covering whilst reducing mineral refilling |
| 11/15/1990 | DE3915538A1 Rotary hard-rock drill - has eccentrically-mounted hammer in housing with milling teeth on bottom edge |
| 11/14/1990 | EP0396534A1 A device for geotechnical or geological sampling |
| 11/13/1990 | US4969528 Method and apparatus for continuous pilot hole coring |
| 10/31/1990 | EP0395620A2 Coring tool |
| 10/18/1990 | WO1990012193A1 Coupling for drilling machine with dust extractor |
| 10/17/1990 | EP0392544A2 Drilling tool |
| 10/17/1990 | EP0391899A1 Device for steering the direction of drilling |
| 10/13/1990 | CA2014570A1 Drilling tool with retractable pilot drilling unit |
| 10/10/1990 | CN2063575U Rope core drill |
| 10/10/1990 | CN1046013A Engineering geology drilling device without pump |
| 09/11/1990 | US4955438 Core drilling tool |
| 09/11/1990 | US4955237 Method and apparatus for measurement of in-situ horizontal stress by freezing of the ground in-situ |
| 09/04/1990 | US4953637 Apparatus for recovering ground soil samples |
| 08/29/1990 | CN2061201U Controllable split-flow type core drilling device |
| 08/23/1990 | WO1990009508A1 Device for taking soil samples |
| 08/21/1990 | US4950844 Method and apparatus for obtaining a core sample at ambient pressure |
| 08/16/1990 | DE3904105A1 Method and device for taking soil samples |
| 08/14/1990 | US4947938 Hole cutter for golf course greens |
| 08/08/1990 | EP0380909A2 Method and coring apparatus for subterranean rock drilling |
| 08/07/1990 | US4946000 Undisturbed soil sampler |
| 08/01/1990 | CA2008975A1 Method and apparatus for directional coring |
| 07/26/1990 | WO1990008243A1 Manhole cutter |
| 07/25/1990 | EP0378747A2 Method and soil-sampling device for preparing soil samples for examination |
| 07/18/1990 | CN2059453U Bivalve combined core barrel |
| 07/11/1990 | CN2059179U Multiple rock core direction-finder |
| 07/04/1990 | EP0376044A2 Core-drilling tool |
| 06/20/1990 | CN1008462B Reversely-fitted circlip type self-controlling on and off long cyclinder engineering geological soft soil-grit sampler |
| 06/05/1990 | US4930587 Coring tool |
| 05/30/1990 | CN2057694U Core claw |
| 05/17/1990 | WO1990005237A1 Coring apparatus |
| 05/15/1990 | US4924951 Manhole cutter |
| 04/26/1990 | DE3933329A1 Drill core extraction grab - has claws on arms with parallel links to central actuating rod |
| 04/17/1990 | US4916945 Apparatus and method for transferring whole core samples |
| 04/03/1990 | CA1267377A1 Beltless core conveyor system for wellsite analysis |