| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 10/12/2004 | CA2375754C Drilling system suitable for coring and other purposes |
| 09/21/2004 | US6792735 Advanced processes for coring and grouting masonry |
| 09/15/2004 | CN1529034A Deep-sea coring device with prefeed and prepositioning unit |
| 09/15/2004 | CN1529033A Dual-guide dual-hydroaulic cylinder deep-sea core drilling machine |
| 09/08/2004 | EP1454033A1 Orientation device for a core sample |
| 09/07/2004 | US6788066 Method and apparatus for measuring resistivity and dielectric in a well core in a measurement while drilling tool |
| 08/26/2004 | US20040164740 Bore location system |
| 08/25/2004 | EP1198657B1 Core orientation |
| 08/11/2004 | CN2632297Y Sidewall coring sleeve |
| 07/28/2004 | CN2628712Y Oil well side-wall core barrel |
| 07/07/2004 | CN2623868Y Undersea cobalt encrustation corer |
| 07/07/2004 | CN2623867Y Single tube core bit |
| 06/23/2004 | EP1005603B1 Methods for seabed piston coring |
| 06/16/2004 | CN2620758Y Concrete hole drilling core taking machine |
| 06/02/2004 | CN1500965A Monitor system for coring operation |
| 05/26/2004 | CN2617915Y Preserved sampling drill |
| 05/25/2004 | CA2242922C Core sampling method and core sampler therefor |
| 05/18/2004 | US6736225 Guide for attachment to a roof bolter to allow for core drilling |
| 05/18/2004 | US6736224 Drilling system and method suitable for coring and other purposes |
| 05/12/2004 | EP1021636B1 Core sampler |
| 05/11/2004 | US6732818 Oriented core barrel system |
| 05/11/2004 | CA2082439C Overcenter toggle latch apparatus |
| 05/06/2004 | US20040084216 Apparatus and methods for sponge coring |
| 05/06/2004 | EP1163423B1 Core barrel |
| 05/04/2004 | US6729416 Method and apparatus for retaining a core sample within a coring tool |
| 04/29/2004 | US20040079555 Sampling isolator |
| 04/29/2004 | US20040079550 Locking split barrel sampler and soil sampling system |
| 04/28/2004 | CN2613584Y Multi-function core extractor |
| 04/21/2004 | EP1411207A2 Sampling isolator |
| 04/21/2004 | EP1411206A2 Soil sampling system |
| 04/16/2004 | CA2444852A1 Locking split barrel sampler and soil sampling system |
| 04/13/2004 | US6719070 Apparatus and methods for sponge coring |
| 04/08/2004 | WO2004029406A1 Soil sampling and extraction unit |
| 04/08/2004 | WO2004029401A1 One-step directional coring or drilling system |
| 04/08/2004 | US20040065478 Oriented core barrel system |
| 04/06/2004 | US6717410 Bore location system |
| 03/30/2004 | US6712158 Apparatus and method for coring and/or drilling |
| 03/23/2004 | US6708784 Core barrel valve assembly |
| 03/17/2004 | EP0995010B1 Core barrel |
| 03/16/2004 | US6705411 Downhole coring device |
| 03/11/2004 | US20040045739 Mapping tool for tracking and/or guiding an underground boring tool |
| 02/26/2004 | US20040035607 Soil sample containment device and method |
| 02/24/2004 | US6695076 Method of coring crustal core sample, and antimicrobial polymeric gel and gel material used in the method |
| 02/24/2004 | US6695075 Soil sampler |
| 02/12/2004 | US20040026127 Method of coring crustal core sample, and antimicrobial polymeric gel and gel material used in the method |
| 01/28/2004 | CN1470737A Natural gas hydrate deep-water shallow-hole pressure-retaining and heat-insulatnig core drilling outfits |
| 01/27/2004 | US6681873 Core stabilization apparatus and method therefor |
| 01/27/2004 | US6681872 In situ reactor |
| 12/18/2003 | WO2003104612A1 In situ reactor |
| 12/11/2003 | US20030226690 In situ reactor |
| 12/09/2003 | US6659204 Method and apparatus for recovering core samples under pressure |
| 12/09/2003 | US6659196 Core orientation |
| 12/09/2003 | US6659195 Externally vented drive head with solid center |
| 11/12/2003 | CN2585968Y Core taking up tool |
| 11/11/2003 | US6644424 Core barrel |
| 11/11/2003 | US6644423 Wireline system for multiple direct push tool usage |
| 11/06/2003 | US20030205411 Guide for attachment to a roof bolter to allow for core drilling |
| 11/06/2003 | US20030205408 Soil sample liner assembly having permanently attached core catcher for use in dual tube sampling system |
| 11/05/2003 | CN2584807Y Pressure retaining thermal insulation core extracting pipe for natrual gas hydrate at deep water shallow hole station |
| 11/04/2003 | US6640907 Mapping tool for tracking and/or guiding an underground boring tool |
| 10/29/2003 | CN2583350Y Double-stage single motion diamond drilling tool |
| 10/23/2003 | US20030197509 Bore location system |
| 10/21/2003 | US6634440 Tool for the removal of a drill core |
| 10/02/2003 | WO2003080987A1 Method and device for coring and/or directional drilling |
| 09/11/2003 | US20030167728 Advanced processes for coring and grouting masonry |
| 09/10/2003 | EP1341989A2 Apparatus and methods for sponge coring |
| 08/20/2003 | EP0874947B1 Core sampling method and core sampler therefor |
| 08/13/2003 | EP1334260A1 Downhole coring device |
| 07/02/2003 | EP1198657A4 Core orientation |
| 07/02/2003 | CN2558757Y Pressure compensator of pressure maintaining seal coring tool |
| 06/26/2003 | US20030116355 Ultrasonic/sonic mechanism of deep drilling (USMOD) |
| 06/26/2003 | US20030116322 Method and device for driving into the marine subsurface at great depths, a tubular tool for soil sampling or for measuring soil characteristics |
| 06/12/2003 | WO2003048505A1 Coring system and method |
| 06/12/2003 | WO2003048504A1 Oil-well drill |
| 06/12/2003 | US20030106717 Coring system and method |
| 06/12/2003 | US20030106716 Externally vented drive head with solid center |
| 05/28/2003 | CN2553099Y Trough type core gripper with slip-collar |
| 05/28/2003 | CN2553098Y Core extracting tool |
| 05/20/2003 | US6564885 Up-hole overshot and safety drilling apparatus |
| 05/15/2003 | US20030089526 Grondmonsternemer |
| 05/08/2003 | WO2003038232A1 Orientation device for a core sample |
| 05/08/2003 | CA2734723A1 Orientation device for a core sample |
| 04/22/2003 | US6550549 Core break-off mechanism |
| 04/10/2003 | US20030066688 Downhole coring device |
| 03/20/2003 | US20030051913 Mapping tool for tracking and/or guiding an underground boring tool |
| 03/04/2003 | US6526818 Seabed analysis |
| 02/26/2003 | EP1285250A1 Device for taking samples from a material of granular or powdery composition |
| 02/13/2003 | US20030029643 Segment for a core drill bit and method of manufacture |
| 02/06/2003 | WO2002040824A3 Apparatus and methods for sponge coring |
| 01/14/2003 | US6505693 Soil sampler |
| 01/01/2003 | CN2528923Y Core claming and protection device of core extractor |
| 12/11/2002 | EP1117875B1 Soil sampler |
| 11/28/2002 | WO2002095183A1 Inner core barrel head assembly for core tube within a drill string |
| 11/27/2002 | EP1259792A1 Method and device for driving into the marine subsurface at great depths, a tubular tool for soil sampling or for measuring soil characteristics |
| 11/20/2002 | EP1023522B1 Core drill |
| 11/19/2002 | CA2257377C Core machine |
| 11/07/2002 | US20020162688 Core stabilization apparatus and method therefor |
| 10/31/2002 | US20020157872 Up-hole overshot and safety drilling apparatus |
| 10/31/2002 | US20020157867 Apparatus and method for coring and/or drilling |
| 10/24/2002 | US20020153168 Tool for the removal of a drill core |