| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 06/07/2000 | CN2381771Y Coring device for gas exploration in coal bed |
| 06/07/2000 | CN2381770Y Device for washing oil from cores |
| 05/10/2000 | EP0999340A2 Soil sampling device |
| 04/26/2000 | EP0995010A1 Core barrel |
| 04/20/2000 | WO2000004238A8 Soil sampler |
| 04/11/2000 | US6047783 Systems, arrangements and associated methods for tracking and/or guiding an underground boring tool |
| 04/11/2000 | US6047782 Assembly and method for extracting discrete soil samples |
| 04/05/2000 | EP0990765A1 Percussive core barrel |
| 03/22/2000 | EP0902858B1 Column closure cap and method of preparing and carrying out column investigations |
| 03/14/2000 | US6035951 System for tracking and/or guiding an underground boring tool |
| 03/14/2000 | US6035950 Method and apparatus for fluid and soil sampling |
| 02/29/2000 | US6029758 Retractable core barrel valving apparatus |
| 02/23/2000 | EP0702746B1 System for in situ replacement of cutting means for a ground drill |
| 02/23/2000 | CN1049719C Method for testing water-covering oil layer saturation degree by using normal boring sample-test reference |
| 02/10/2000 | WO2000006866A1 Method and apparatus for recovering core samples under pressure |
| 02/09/2000 | CN2363047Y Clamp for core extractor |
| 02/01/2000 | US6019181 Core drilling latch assembly |
| 01/27/2000 | WO2000004238A1 Soil sampler |
| 01/26/2000 | CN2360587Y Long core gravity pison sampler |
| 01/26/2000 | CN2360586Y Reverely latching-proof core taking up tool |
| 01/19/2000 | CN2359450Y Rope-type safety coring tool |
| 01/04/2000 | US6009960 Coring tool |
| 01/04/2000 | US6009958 Soil sampling apparatus and a geological observation method using the same |
| 12/28/1999 | US6006844 Method and apparatus for simultaneous coring and formation evaluation |
| 12/21/1999 | US6005532 Orthogonal antenna arrangement and method |
| 12/21/1999 | US6003619 Back driving automatic hammer |
| 12/14/1999 | US6000481 Method and apparatus for environmental sampling |
| 12/08/1999 | CN2352670Y Screw pushing rod type apparatus for taking-in or pushing-out core sample |
| 11/30/1999 | US5992543 Core drilling latch assembly |
| 11/24/1999 | CN1046783C System for insitu replacement of cutting means for a ground drill |
| 11/09/1999 | US5980628 Curable gypsum-containing composition and method for stabilization of unconsolidated core samples |
| 11/09/1999 | US5979569 Method and apparatus for environmental sampling |
| 11/09/1999 | CA2014895C Coring tool |
| 09/28/1999 | US5957221 Downhole core sampling and testing apparatus |
| 09/21/1999 | US5954146 System for in situ replacement of cutting means for a ground drill |
| 09/14/1999 | US5950740 Soil sampling apparatus |
| 09/09/1999 | DE19807898A1 Bore drilling machine for drilling bores in concrete component e.g. drainage pipe |
| 08/17/1999 | US5937953 Soil sampling tool with unique vent-and-seal features and related method |
| 08/10/1999 | US5934393 Core barrel apparatus |
| 08/03/1999 | US5931237 Soil testing assemblies |
| 07/28/1999 | CN1224109A Numerically controlled perforating coring apparatus |
| 07/21/1999 | CN2329760Y Concrete drilling core extractor |
| 07/13/1999 | US5921328 Soil sampler |
| 06/10/1999 | DE19753353A1 Cutting machine used in mining to excavate coal, rock or mineral ore |
| 05/11/1999 | US5901799 Connection for first and second members |
| 04/29/1999 | WO1999020870A1 Core drill |
| 04/01/1999 | DE19744211A1 Ice drill for extracting sea ice cores |
| 03/31/1999 | EP0904481A1 Core machine |
| 03/24/1999 | EP0902858A1 Column closure cap and method of preparing and carrying out column investigations |
| 03/23/1999 | US5884714 Method and apparatus for fluid and soil sampling |
| 03/16/1999 | US5881825 Method for preserving core sample integrity |
| 03/04/1999 | WO1999010620A1 Core sampler |
| 02/25/1999 | WO1999009294A1 Methods for seabed piston coring |
| 02/02/1999 | USH1780 Soil sample core system |
| 01/21/1999 | WO1999002816A1 Core barrel |
| 01/06/1999 | CN2303080Y Core sampler of wellbore core barrel |
| 12/29/1998 | US5854432 Dual tube sampling system |
| 12/17/1998 | WO1998056552A1 Apparatus for preventing cut core from falling for core drills |
| 12/16/1998 | EP0883731A1 Core sampler |
| 12/15/1998 | US5850620 Method of fertilizer application |
| 12/10/1998 | WO1998055730A1 Retrieval head for a drill bit composed of a plurality of bit segments |
| 12/10/1998 | CA2293594A1 Retrieval head for a drill bit composed of a plurality of bit segments |
| 12/08/1998 | CA2151272C System for in situ replacement of cutting means for a ground drill |
| 11/04/1998 | EP0874947A1 Core sampling method and core sampler therefor |
| 11/04/1998 | EP0581838B1 Engine for performing subsea operations and use of it in a core sampler |
| 11/03/1998 | US5831185 Method and apparatus for collecting samples of earth materials |
| 11/03/1998 | CA2189855C Method and related cartridge for obtaining a soil sample |
| 10/21/1998 | EP0765430A4 Soil sampler |
| 10/20/1998 | US5823276 Diamond-tipped core barrel and method of using same |
| 10/14/1998 | EP0720686A4 Method and apparatus for fluid and soil sampling |
| 10/07/1998 | CN2293640Y Digital control side-wall core extractor |
| 09/30/1998 | EP0701466B1 A hole-making device |
| 09/29/1998 | US5813481 System for in situ replacement of cutting means for a ground drill |
| 09/01/1998 | US5800096 Subsurface barrier wall and method of installation |
| 09/01/1998 | US5799742 Core drilling latch assembly |
| 07/28/1998 | US5785134 System for in-situ replacement of cutting means for a ground drill |
| 07/14/1998 | US5778993 Locking a sample tube in a downhole hammer |
| 06/30/1998 | US5771985 Earth penetrating apparatus for obtaining sediment samples, driving instrument probes, pilings, or sheet pilings |
| 06/16/1998 | US5765437 Compost aerator and monitor |
| 05/27/1998 | EP0844331A1 Power transmission device for a drill for obtaining soil samples |
| 05/13/1998 | CN1038354C High effective sealing liquid |
| 04/28/1998 | US5743343 Method and apparatus for fluid and soil sampling |
| 04/23/1998 | DE19745947A1 Vorrichtung und Verfahren zum Bohren von Erdformationen Apparatus and method for drilling earth formations |
| 04/21/1998 | US5741983 Soil sampler for analysis for fertilizer determination |
| 04/15/1998 | CN2278764Y Coring tool |
| 04/01/1998 | EP0832049A1 Curable gypsum-containing composition and method for stabilization of unconsolidated core |
| 03/24/1998 | US5730235 Method and apparatus for removing material from a hole in a strata for use in forcing a member into material comprising or underlying this strata |
| 02/19/1998 | DE19729059A1 Sealing arrangement for boreholes in rock formations with pressure burden |
| 02/18/1998 | CN2274688Y Core catcher for rope coring tool |
| 01/29/1998 | WO1998003768A1 Soil sampling tool with unique vent-and-seal feature |
| 01/13/1998 | US5706904 Soil sampling tool with volume-indicating feature |
| 01/07/1998 | EP0815351A1 Method and apparatus for fluid and soil sampling |
| 12/24/1997 | WO1997048878A1 Core barrel drill tube, method of manufacture and use of the said inner tube |
| 12/11/1997 | WO1997046790A1 Core machine |
| 12/11/1997 | WO1997046789A1 Column closure cap and method of preparing and carrying out column investigations |
| 12/11/1997 | DE19623886A1 Coring tube system used in core drilling to assay near-surface contaminated ground |
| 12/11/1997 | DE19623780A1 Säulenverschlußkappe und Verfahren zur Vorbereitung und Durchführung von Säulenuntersuchungen The column closure cap and method for the preparation and implementation of column tests |
| 11/06/1997 | WO1997032110A3 Downhole core sampling and testing apparatus |
| 10/07/1997 | US5673762 Expendable protective sleeve and method of use for soil and groundwater sampling |
| 09/23/1997 | US5670717 Method and device for detecting and/or measuring at least one geophysical parameter from a core sample |