| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 03/30/1995 | WO1995008694A1 Method and apparatus for fluid and soil sampling |
| 03/15/1995 | EP0642625A1 Hydraulic jack hammer, for example for marine sampling |
| 03/09/1995 | WO1995006798A1 Coring assembly and method |
| 02/16/1995 | WO1995004870A1 Soil sampler for analysis for fertilizer determination |
| 02/16/1995 | WO1995004450A1 Method of fertilizer application |
| 01/18/1995 | CN2187675Y Hydraulic impact well bottom two-direction circulation core-taking drill |
| 12/22/1994 | WO1994029567A1 System for in situ replacement of cutting means for a ground drill |
| 12/17/1994 | CA2124265A1 Method and system for the early detection of the jamming of a core sampling device in an earth borehole, and for taking remedial action responsive thereto |
| 12/08/1994 | WO1994028281A1 A device for core drill |
| 12/08/1994 | WO1994027687A1 A hole-making device |
| 12/08/1994 | DE4318736A1 Method and apparatus for taking gas and/or oil and/or water and/or solid samples during drilling operation |
| 12/08/1994 | CA2164112A1 A hole-making device |
| 12/08/1994 | CA2163787A1 A device for core drill |
| 11/01/1994 | US5360074 Method and composition for preserving core sample integrity using an encapsulating material |
| 10/26/1994 | EP0621396A2 Method and composition for preserving core sample integrity using an encapsulating material |
| 10/13/1994 | WO1994023181A1 Hydraulic jack hammer, for example for marine sampling |
| 10/04/1994 | US5351765 Coring assembly and method |
| 09/21/1994 | CN2177797Y Engineering drilling core extractor |
| 09/06/1994 | US5343771 Tool for sampling soil containing volatile organic compound |
| 08/23/1994 | US5339915 Drilling apparatus, particularly wire line core drilling apparatus |
| 08/23/1994 | US5339679 Self-contained apparatus and method for determining the static and dynamic loading characteristics of a soil bed |
| 08/16/1994 | US5337831 Power-driven golf cup cutter |
| 08/04/1994 | WO1994017386A1 Material sampling method and device |
| 07/20/1994 | EP0531336B1 Double-tube core drill for inclined drilling |
| 07/12/1994 | US5328221 Core puller for pulling test cores |
| 07/05/1994 | US5325930 Overcenter toggle latch apparatus |
| 06/21/1994 | US5322135 Open hole coring method |
| 06/21/1994 | US5322133 Apparatus for obtaining a soil core sample |
| 05/18/1994 | EP0466702B1 Coupling for drilling machine with dust extractor |
| 05/11/1994 | CN2164460Y Rock core holder |
| 05/10/1994 | US5310013 Core marking system for a sidewall coring tool |
| 05/04/1994 | CN2163865Y Locking and sealing device for closed core-extractor |
| 04/26/1994 | CA1328793C Core surface washer |
| 04/13/1994 | CN2161718Y Regulating device for inner barrel of core-drilling tool |
| 04/12/1994 | US5301759 Method and apparatus for core-sampling subsurface rock formations |
| 03/24/1994 | DE4231025A1 Deep drilling tool drive assembly of tubular form - in which a residual core can grow within a core pipe which extends through the pipe |
| 03/23/1994 | EP0588373A1 Double-tube core taking apparatus for inclined drilling |
| 02/15/1994 | CA1327035C Core drilling tool |
| 02/09/1994 | EP0581838A1 Engine for performing subsea operations and devices driven by such an engine |
| 01/20/1994 | WO1994001653A1 Method and device for taking a core sample |
| 01/06/1994 | WO1994000670A1 Survey process for cable core borings and device for implementing it |
| 01/04/1994 | US5275245 Device to facilitate creating foxholes with explosives and method of making the same |
| 12/29/1993 | CN2151247Y Hanging shaft of core taking tools |
| 12/25/1993 | CA2072203A1 Core orientation device |
| 12/16/1993 | DE4217695A1 Mobile drilling system for hollow worm drilling - has slide on drill mast which is attached to vehicle, and accommodates rotating drive and has hole through which cable core device may run |
| 12/15/1993 | EP0573718A1 Moving apparatus for the automatic collection of ground samples |
| 12/09/1993 | WO1993024708A1 Apparatus for drilling and maintenance of holes in a golf course |
| 12/07/1993 | US5267620 Drilling latch apparatus |
| 11/03/1993 | CN2145260Y Safety automatic standard |
| 10/27/1993 | CN2144707Y Rope fishing type tool for continuous obtaining core |
| 10/19/1993 | US5253961 Coupling for drilling machine with dust extractor |
| 10/19/1993 | US5253720 Method and apparatus for taking an undisturbed core sample |
| 10/13/1993 | CN1022431C Through type in the hole drill reversing circulation core bit |
| 10/06/1993 | EP0457791B1 Device for taking soil samples |
| 09/29/1993 | CN2142881Y Drilling tool of double tube and motion cord with advanced inner tube |
| 09/21/1993 | US5245878 Vegetation maintenance system |
| 09/08/1993 | EP0559127A1 Self-contained closure mechanism for a core barrel inner tube assembly |
| 09/07/1993 | CA2090845A1 Self-contained closure mechanism for a core barrel inner tube assembly |
| 08/05/1993 | DE4216472C1 Investigation of heavy metal contaminated soils - includes sealing walls of borehole using mixts. of polymeric pyrrolidinium salts with alkali silicate(s) or with bentonite-modified montan wax emulsions an limiting boring speed |
| 08/03/1993 | CA1320944C Method and apparatus for continuous pilot hole coring |
| 07/27/1993 | US5230390 Self-contained closure mechanism for a core barrel inner tube assembly |
| 07/07/1993 | CN2137710Y Core receiver for soft cataclasite layer |
| 06/16/1993 | CN2136323Y Pdc sealed coring bit |
| 05/18/1993 | US5211715 Coring with tubing run tools from a producing well |
| 05/18/1993 | US5211249 Apparatus and method for obtaining subterranean samples |
| 05/11/1993 | US5209310 Corebarrel |
| 04/27/1993 | US5206505 Apparatus and method for retrieving and evaluating a slim hole drilled core sample of a subsurface formation |
| 04/14/1993 | CN2129816Y Inner coated layer rock core tube capable of increasing core length taking |
| 03/18/1993 | WO1993005271A1 Process and device for measuring cable drilled bores |
| 03/17/1993 | EP0531336A1 Double-tube core drill for inclined drilling. |
| 02/23/1993 | US5188190 Method for obtaining cores from a producing well |
| 02/16/1993 | US5186263 Soil sample probe |
| 02/02/1993 | US5182954 Inner tube element for use in a device for taking soil samples, and method for manufacturing such an inner tube element |
| 01/12/1993 | US5178221 Core-gathering apparatus and a main conveyor belt drive roller structure for the apparatus |
| 12/22/1992 | CA1311743C Method and apparatus for taking core samples |
| 12/08/1992 | US5168940 Profile melting-drill process and device |
| 10/27/1992 | WO1992019836A1 Engine for performing subsea operations and devices driven by such an engine |
| 10/27/1992 | CA2109107A1 Machine for subsea operations |
| 10/15/1992 | DE4112116A1 Coring drill sand with compressed air feed - has transparent cylinder scaled on outside and seal allowing limited movement |
| 10/14/1992 | EP0508329A2 Inner tube stabilizer for a corebarrel |
| 10/07/1992 | CN2118151U Automatic lifting coring pipe |
| 10/07/1992 | CN2118150U Hydraulic penetrating type impactor |
| 10/07/1992 | CN2118149U Hydraulic impacting hole buttom bidirectional circulating core drilling |
| 10/05/1992 | CA2065143A1 Shoe assembly with catcher for coring |
| 10/05/1992 | CA2065142A1 Inner tube stabilizer for a corebarrel |
| 09/29/1992 | CA1308153C Anti-blockage bearing |
| 09/23/1992 | CN2116773U Split core tube |
| 09/22/1992 | US5148875 Method and apparatus for horizontal drilling |
| 09/16/1992 | CN2116081U Jet-type back recycle wire-line coring drilling tool |
| 09/15/1992 | US5146999 Shoe assembly with catcher for coring |
| 09/10/1992 | DE4107537A1 Earth sample extractor using probe with cylindrical pipe sleeve - having handling section at top and exchangeable tip at base |
| 09/09/1992 | CN2115400U Horizontal well coring tool |
| 08/18/1992 | CA1306457C Core orientation system |
| 07/29/1992 | CN1063137A Diamond drilling tool used for complex stratum |
| 07/22/1992 | CN2110705U Device for centralising and vibration-obsorption of drill rod |
| 07/07/1992 | US5127261 Self-contained apparatus and method for determining the static and dynamic loading characteristics of a soil bed |
| 06/30/1992 | US5125266 Self-contained apparatus and method for determining the static and dynamic loading characteristics of a soil bed |
| 06/24/1992 | CN2108171U Coring tool for horizontal well section |
| 06/24/1992 | CN2108166U Dual pipe drilling tools with single acting local reverse recycle |
| 05/26/1992 | US5116147 Anti-blockage bearing |