| Patents for E21B 15 - Supports for the drilling machine, e.g. derricks or masts (4,619) |
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| 01/28/1998 | EP0820421A2 Displaceable working apparatus with extensible boom |
| 01/27/1998 | US5711384 Anchoring apparatus for the boring wagon of a mobile earth boring mechanism |
| 01/21/1998 | EP0819820A1 Horizontal drilling machine |
| 01/20/1998 | US5709277 Directional boring machine |
| 01/20/1998 | US5709276 Multi-position directional drill |
| 01/13/1998 | US5706897 Drilling, production, test, and oil storage caisson |
| 01/07/1998 | EP0815352A1 An arrangement in a feed beam of a rock drill |
| 01/07/1998 | EP0815350A1 Drilling device |
| 01/07/1998 | CN2272045Y Folding ladder for derrick |
| 01/06/1998 | US5704716 In a rock drilling machine |
| 01/06/1998 | US5704427 Portable well service rig |
| 01/02/1998 | DE19625037A1 Earth moving machine |
| 12/31/1997 | CN2271608Y Base supporting structure of headframe |
| 12/30/1997 | US5702205 Steel catenary riser system for marine platform |
| 12/29/1997 | EP0813647A2 Universal pipe injection apparatus for wells and method |
| 12/16/1997 | US5697457 No load derrick for drilling rig |
| 11/26/1997 | CN1165924A Guided drilling system with shock absorber |
| 11/19/1997 | EP0807203A1 Continuous control system for a mining or tunnelling machine |
| 11/13/1997 | WO1997042393A1 Multi-activity offshore exploration and/or development drilling method and apparatus |
| 11/12/1997 | CN1164882A Device for drilling holes and/or slits |
| 11/05/1997 | EP0805257A2 Guided drilling system with shock absorber |
| 10/23/1997 | DE19641922C1 System for producing bore holes for setting anchors |
| 10/21/1997 | US5678801 Post hole digger stand |
| 09/24/1997 | EP0796386A1 Arrangement for mounting swing cylinders in boom for rock drilling unit |
| 09/16/1997 | US5667013 Method and apparatus for supporting casing string from mobile offshore platform |
| 07/15/1997 | US5647442 Drill rig with carrier/mast safety interlock |
| 07/03/1997 | WO1997023706A1 Apparatus and method for raising and lowering a piston in a piston-cylinder arrangement in a derrick |
| 07/03/1997 | WO1997023705A1 Arrangement in connection with a yoke in a hoisting system for a derrick |
| 07/03/1997 | CA2240659A1 Arrangement in connection with a yoke in a hoisting system for a derrick |
| 06/11/1997 | EP0777815A1 Arrangement in boom for rock drilling unit |
| 06/11/1997 | EP0777814A1 Arrangement for controlling boom for rock drilling unit |
| 06/11/1997 | EP0777812A1 Device for drilling holes and/or slits |
| 06/11/1997 | EP0777810A1 Portable top drive |
| 05/28/1997 | EP0643787A4 Method and apparatus for transporting and using a drilling apparatus or a crane apparatus from a single movable vessel. |
| 05/20/1997 | US5630477 Downcrowdable telescopic augering apparatus |
| 05/14/1997 | EP0772727A1 Drilling support unit to be mounted on an excavator boom |
| 04/30/1997 | DE19538557A1 Process to replace buried gas or water supply pipes in sections |
| 04/17/1997 | WO1997013953A1 Portable well service rig |
| 04/02/1997 | EP0765430A1 Soil sampler |
| 03/27/1997 | WO1997011243A1 Telescoping derrick |
| 03/19/1997 | CN2249821Y Tower-rocker-arm above-setting two action long range oil sucker |
| 03/19/1997 | CN2249819Y Hydraulic controlled locking mechanism for maintaining standing derrick |
| 03/06/1997 | WO1997008419A1 Multi-linked working boom for working machine |
| 03/06/1997 | DE19537591A1 Machine for introducing planting holes into ground |
| 03/05/1997 | EP0542876B1 Controlled fracture method and apparatus for breaking hard compact rock and concrete materials |
| 03/05/1997 | CN1144290A Fixed offshore platform structures using small diameter, tensioned, well casing tiebacks |
| 03/04/1997 | US5607259 Process for assembling long sections of booms of support legs of an oil platform |
| 02/20/1997 | WO1997006348A1 Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 02/20/1997 | WO1996033335A3 Displaceable working apparatus with extensible boom |
| 02/20/1997 | CA2235676A1 Method for controlled fragmentation of hard rock and concrete by the combination use of impact hammers and small charge blasting |
| 02/11/1997 | US5601148 Arrangement for measuring the position of a feed beam in a rock drilling apparatus and/or measuring the position of a rock drill |
| 02/05/1997 | EP0757155A1 Earth drilling device |
| 02/05/1997 | CA2182729A1 Ground drilling apparatus |
| 01/23/1997 | WO1997002402A1 Device for drilling holes and/or slits |
| 01/16/1997 | WO1996028633A3 Universal pipe injection apparatus for wells and method |
| 01/14/1997 | US5592993 Directional auger attachment |
| 01/09/1997 | WO1997001019A1 Arrangement for a telescope feeder of a rock-drilling machine |
| 01/02/1997 | EP0551299B1 Method of drilling holes in rock |
| 12/27/1996 | WO1996041922A1 Method for improving the feasibility of a drilling rig of jack-up type and a drilling rig of jack-up type |
| 12/24/1996 | US5586743 Auger stand |
| 12/17/1996 | US5584351 Drilling machine and method of horizontal boring |
| 12/11/1996 | EP0746668A1 Arrangement and method for controlling boom actuating cylinders in rock drilling equipment |
| 12/10/1996 | US5582467 Displaceable working apparatus with extensible boom |
| 12/04/1996 | EP0745528A2 Universal construction apparatus |
| 11/28/1996 | DE19518820A1 Drill for wide-bore holing in waterbearing ground |
| 11/26/1996 | US5578769 Methods and apparatus for undisturbed subsurface soil chemistry sampling |
| 11/12/1996 | US5573076 Automated drill |
| 11/06/1996 | CN2239498Y Drilling rig headgear regulating arrangement |
| 10/30/1996 | EP0558567B1 A method for aligning a feeding beam in a rock drilling equipment and a rock drilling equipment and a measuring device |
| 10/24/1996 | WO1996033337A1 A hydraulic arrangement for turning the actuator of a rock drilling machine |
| 10/24/1996 | WO1996033335A2 Displaceable working apparatus with extensible boom |
| 10/24/1996 | CA2217578A1 Displaceable working apparatus with extensible boom |
| 10/10/1996 | DE19512109A1 Drilling rig mounted on tractor unit with compact drive head arrangement |
| 10/03/1996 | WO1996030627A1 Drilling device |
| 10/02/1996 | DE19524389C1 Self-propelled vertical and horizontal drilling equipment |
| 10/02/1996 | DE19512070A1 Mobile drilling rig with interconnecting drive heads |
| 09/26/1996 | WO1996029503A1 An arrangement in a feed beam of a rock drill |
| 09/25/1996 | CN2236014Y V-shape rack for petroleum well drill frame |
| 09/19/1996 | WO1996028633A2 Universal pipe injection apparatus for wells and method |
| 09/17/1996 | US5555947 Mole launcher and a method of operating a mole launcher |
| 09/11/1996 | EP0731251A2 A stowing and handling system for rods used in drilling rigs |
| 09/03/1996 | CA2101668C Self positioning dust seal holder |
| 08/15/1996 | WO1996024753A1 Continuous control system for a mining or tunnelling machine |
| 08/14/1996 | EP0725865A1 Drilling apparatus |
| 08/14/1996 | EP0592547B1 Pile driving machine |
| 06/12/1996 | EP0715679A1 Arrangement for mounting slides |
| 06/12/1996 | EP0551351B1 Method and equipment for aligning the feeding beam of a rock drilling equipment |
| 06/11/1996 | US5524716 Bi-directionally extensible tool driving apparatus |
| 04/18/1996 | WO1996011322A1 No load derrick for drilling rig |
| 04/16/1996 | US5507107 Hoisting boom assembly |
| 04/10/1996 | CN2224273Y Derrick-lift tower crane revolving to attatch to standard rotary table |
| 04/04/1996 | DE19509135C1 Method of stope drilling for quarry blasting |
| 03/26/1996 | US5501286 Method and apparatus for displacing a top drive torque track |
| 03/21/1996 | WO1996008631A1 Portable top drive |
| 03/14/1996 | DE19506337C1 Anchoring device for drilling carriage of mobile earth drilling equipment |
| 03/07/1996 | WO1996007014A1 Arrangement for mounting swing cylinders in boom for rock drilling unit |
| 03/07/1996 | WO1996007013A1 Arrangement in boom for rock drilling unit |
| 03/07/1996 | WO1996007012A1 Arrangement for controlling boom for rock drilling unit |
| 03/07/1996 | WO1996006714A1 Stand for a stone-working machine, especially a core boring machine |
| 02/20/1996 | CA1338064C Ground anchor installing apparatus |