| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 09/30/1987 | EP0239065A1 Device for sampling marine sediments |
| 08/19/1987 | EP0232268A1 Device for controlling the locking of a sampling tube. |
| 07/14/1987 | US4679636 Method and apparatus for coring rock |
| 07/07/1987 | CA1223862A1 Hydraulic lift inner barrel in a drill string coring tool |
| 07/01/1987 | EP0227192A2 Method for determining the amount of oil in a sponge core |
| 06/24/1987 | CN86200075U Hydraulic three-cylinder type core extractor |
| 06/23/1987 | CA1223246A1 Coring device with an improved core sleeve and anti- gripping collar |
| 06/23/1987 | CA1223245A1 Coring device with an improved weighted core sleeve and anti-gripping collar |
| 06/09/1987 | US4671367 Pole hole digger with percussive core drilling |
| 05/27/1987 | CN86206218U Geologic sampling tube |
| 05/26/1987 | US4667754 Flexible plug for obtaining soil samples during drilling operations |
| 05/26/1987 | US4667753 Core retainer for sidewall core tools |
| 05/20/1987 | CN86202123U Core state apparatus |
| 05/19/1987 | US4665791 Method for accelerating an object and propelling arrangement for implementing the method for such object, particularly an object to be driven into ground below water |
| 05/12/1987 | US4664205 Hydraulic inner barrel in a drill string coring tool |
| 05/12/1987 | US4664204 Fixing mechanism for a wireline core barrel of core drilling equipment |
| 05/12/1987 | CA1221680A1 Coring device with an improved core sleeve and anti- gripping collar with a collective core catcher |
| 04/15/1987 | CN86103099A Special non-solid-state washings for drill sampling in friable and broken stratum |
| 04/14/1987 | US4657445 Core drill and method of removing a core therefrom |
| 03/31/1987 | US4653336 Combination soil auger and soil core sampler with sample retaining capacity |
| 03/24/1987 | US4651835 Core catcher for use with an hydraulically displaced inner tube in a coring tool |
| 03/03/1987 | US4646843 For use in lifting a liquid from within a well |
| 02/17/1987 | US4643265 Core barrel apparatus for disposing a core within a thin, flexible film casing |
| 02/11/1987 | CN86102084A Force-moment-enhanced pneumatic grabbing bucket |
| 01/27/1987 | US4638872 Core monitoring device |
| 01/14/1987 | EP0208532A2 Core sampling device |
| 12/30/1986 | EP0205430A1 Method for inner cleaning of a core bit with reversed fluid flushing and a core bit herefor |
| 12/23/1986 | US4631677 Method for determining the placement of perforations in a well casing |
| 12/18/1986 | WO1986007398A1 Arrangement for a soil sampler |
| 12/02/1986 | US4625813 Method and apparatus for coring in subaqueous structures |
| 10/22/1986 | EP0198406A1 An improved hydraulic inner barrel in a drill string coring tool |
| 10/15/1986 | EP0197696A2 Core monitoring device |
| 08/26/1986 | US4607710 Cammed and shrouded core catcher |
| 08/19/1986 | US4606416 Self activating, positively driven concealed core catcher |
| 08/12/1986 | US4605075 Shrouded core catcher |
| 08/05/1986 | US4603749 Apparatus for downward displacement of an inner tube within a coring barrel |
| 07/22/1986 | US4601354 Means and method for facilitating measurements while coring |
| 07/22/1986 | CA1208198A1 Precussion actuated core sampler |
| 07/08/1986 | US4598777 Well core drilling apparatus for recovery of subterranean fluid |
| 06/17/1986 | US4594885 Projectile-propelling apparatus |
| 06/03/1986 | CA1205456A1 Rotating double barrel core sampler |
| 05/28/1986 | EP0182498A1 Method and apparatus for preventing contamination of a coring sponge |
| 05/13/1986 | US4588036 Continuous, undisturbed sampling by rotational boring in non-plastic granular tills |
| 04/10/1986 | WO1986002124A1 Device for controlling the locking of a sampling tube |
| 04/08/1986 | US4580643 Adjustable bearing section core barrel |
| 03/26/1986 | EP0175536A2 Retrieval device |
| 03/26/1986 | EP0174972A1 Hammer for use in a bore hole and apparatus for use therewith. |
| 03/19/1986 | EP0174615A2 Adjustable bearing section core barrel |
| 03/05/1986 | EP0173299A2 Self activating, positively driven concealed core catcher |
| 03/04/1986 | US4573539 Apparatus for use in a coring tool in a drill string |
| 02/11/1986 | US4569710 Process for manufacturing the inner tube element for a double tube coring apparatus |
| 01/28/1986 | US4566545 Coring device with an improved core sleeve and anti-gripping collar with a collective core catcher |
| 01/07/1986 | CA1198983A1 Pressure core barrel for the sidewall coring tool |
| 12/31/1985 | US4561289 Perforated end plug plate for testing core samples |
| 12/17/1985 | US4558749 Anti-jamming core barrels |
| 12/03/1985 | US4556114 Soil sampler device |
| 11/19/1985 | US4553613 Hydraulic lift inner barrel in a drill string coring tool |
| 11/12/1985 | US4552229 Externally powered core catcher |
| 10/29/1985 | US4549612 Soil sampler |
| 10/22/1985 | CA1195491A1 Core orientation instrument |
| 10/02/1985 | EP0156609A1 Hammer for use in a bore hole and apparatus for use therewith |
| 09/26/1985 | WO1985004212A1 Hammer for use in a bore hole and apparatus for use therewith |
| 08/15/1985 | WO1985003545A1 Method for inner cleaning of a core bit with reversed fluid flushing and a core bit herefor |
| 08/13/1985 | US4534231 Method and device for taking soil samples |
| 06/19/1985 | EP0145241A2 Improvements in or relating to apparatus and methods for driving projectiles |
| 06/04/1985 | CA1188063A1 Method of coating core samples |
| 05/28/1985 | US4519592 Device for holding formation cores for boring |
| 05/21/1985 | US4518051 Percussion actuated core sampler |
| 05/21/1985 | US4518050 Rotating double barrel core sampler |
| 05/15/1985 | EP0141617A2 Geotechnical device |
| 05/02/1985 | EP0139263A2 Hydraulically pulsed indexing system for sleeve-type core barrels |
| 04/23/1985 | US4512423 Coring device with an improved weighted core sleeve and anti-gripping collar |
| 04/23/1985 | US4512419 Coring device with an improved core sleeve and anti-gripping collar |
| 04/03/1985 | EP0135926A1 A coring device with an improved core sleeve and anti-gripping collar with a collective core catcher |
| 04/03/1985 | EP0135859A1 A coring device with an improved weighted core sleeve and anti-gripping collar |
| 03/20/1985 | EP0134586A1 Hydraulic lift inner barrel in a drill string coring tool |
| 03/20/1985 | EP0134581A1 A coring device with an improved core sleeve and anti-gripping collar |
| 03/05/1985 | US4502553 Sponge coring apparatus with reinforced sponge |
| 02/19/1985 | US4499956 Locking means for facilitating measurements while coring |
| 02/19/1985 | US4499955 Battery powered means and method for facilitating measurements while coring |
| 02/12/1985 | US4498547 Earth soil sampler |
| 02/12/1985 | CA1182441A1 Releasing device in core barrel grapplers |
| 02/05/1985 | US4497382 Retractable core drill bit |
| 01/23/1985 | EP0132020A1 Method and apparatus for reducing field filter cake on sponge cores |
| 01/15/1985 | CA1180991A1 Synthetic resin inner tube element for dual tube core drill |
| 01/08/1985 | US4492275 For monitoring detrimental conditions |
| 12/11/1984 | US4487271 For sampling dense mineral specimens |
| 10/30/1984 | US4479557 Method and apparatus for reducing field filter cake on sponge cores |
| 08/21/1984 | US4466497 Wireline core barrel |
| 08/21/1984 | US4466495 Pressure core barrel for the sidewall coring tool |
| 08/07/1984 | US4463602 Rock core test unit vibrator |
| 06/26/1984 | US4456079 Apparatus and method for taking soil samples |
| 06/19/1984 | CA1169414A1 Device in core barrels |
| 06/05/1984 | US4452322 Drilling device for drilling a core in deep drill holes |
| 06/05/1984 | US4452321 Device in core barrels |
| 06/05/1984 | CA1168471A1 Method and apparatus for obtaining saturation data from subterranean formations |
| 05/22/1984 | US4449594 Method for obtaining pressurized core samples from underpressurized reservoirs |
| 05/16/1984 | EP0108696A1 Method and apparatus for advancing quickly through non valuable soil when drilling an exploration well |
| 05/16/1984 | EP0108157A1 Sampling device for taking undisturbed soil samples |
| 04/17/1984 | US4442721 Moisture and consistency soil sampler |