| Patents for E21B 15 - Supports for the drilling machine, e.g. derricks or masts (4,619) |
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| 02/02/1993 | US5183122 Derrick assembly capable of conveying pipe sections between a drill string and a rack for said pipe sections |
| 01/21/1993 | WO1993001364A1 Pile driving machine |
| 01/19/1993 | CA1312855C Gooseneck assembly for rock drill and method for inserting friction rock stabilizer |
| 01/07/1993 | WO1993000286A1 Improvement for a hoisting boom assembly |
| 12/28/1992 | CA2045822A1 Hoisting boom assembly |
| 12/10/1992 | WO1992021853A1 Hole indexing device for rock drilling |
| 12/10/1992 | WO1992021852A1 Method and drilling apparatus for line drilling |
| 12/09/1992 | CN2124303U Lifting derrick with bolt ball joint frame structure |
| 11/11/1992 | CN1019038B Method of and arrangement for drilling hole in rock |
| 11/10/1992 | US5161639 Derrick counterweight assembly |
| 10/29/1992 | WO1992018741A1 Wire line splitting and reassembling method and apparatus |
| 10/27/1992 | US5158146 Mobile foxhole excavator |
| 10/15/1992 | DE4112116A1 Coring drill sand with compressed air feed - has transparent cylinder scaled on outside and seal allowing limited movement |
| 10/06/1992 | US5152638 Process and apparatus for excavating tunnels |
| 09/09/1992 | CN2115399U Land blocks self-lift type deep well drilling derrick base |
| 08/18/1992 | US5139097 Rock drilling apparatus |
| 08/14/1992 | CA2054809A1 Self-propelled drilling module |
| 08/12/1992 | CN2112680U Station moving device for drill machine platform |
| 08/04/1992 | CA1305867C Caisson tower platform and method of setting same |
| 07/14/1992 | US5129764 Device to feed reinforcement rods |
| 07/14/1992 | US5129464 System for controlling a rock drill |
| 07/01/1992 | EP0491964A1 Apparatus for injecting soil conditioning fluid |
| 06/24/1992 | CN2108167U Four-pole derrick |
| 06/11/1992 | WO1992009787A1 A method for aligning a feeding beam in a rock drilling equipment and a rock drilling equipment and a measuring device |
| 05/26/1992 | US5116164 Device to load reinforcement rods |
| 05/12/1992 | US5111801 Apparatus for forming slit in rock and concrete surface |
| 05/05/1992 | US5109934 Mobile drilling rig for closely spaced well centers |
| 04/28/1992 | US5107940 Top drive torque restraint system |
| 04/16/1992 | WO1992006279A1 Method and equipment for aligning the feeding beam of a rock drilling equipment |
| 04/16/1992 | WO1992006276A1 Method of drilling holes in rock |
| 04/15/1992 | CN1060332A Assembling-disassembling machine for quadrangular boring tower |
| 04/09/1992 | DE4031687A1 Small drill incorporated in vertical frame - is mounted on two-wheel chassis and has hollow auger operated by system of steel cables and windlasses |
| 04/08/1992 | CN2101100U Machine installation reversible four-angle drilling tower |
| 03/25/1992 | CN2099831U Oil cylinder for telescopic derrick |
| 03/24/1992 | US5098163 Controlled fracture method and apparatus for breaking hard compact rock and concrete materials |
| 03/03/1992 | CA1296619C Oil production facility of modular design for underwater station |
| 02/20/1992 | WO1992002709A1 Controlled fracture method and apparatus for breaking hard compact rock and concrete materials |
| 02/06/1992 | WO1992001840A1 Apparatus for injecting soil conditioning fluid |
| 12/29/1991 | WO1992000439A1 Vertical drilling boom |
| 12/29/1991 | CA2085471A1 Vertical drilling boom |
| 12/27/1991 | EP0462719A2 Conductor guide forming machine |
| 12/26/1991 | WO1991019885A1 Apparatus for feeding a drilling machine in extension rod drilling |
| 12/18/1991 | EP0461512A2 Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a well |
| 12/05/1991 | DE4016759A1 Hydraulic hammer-scoop combination - fits on excavator arm, and involves support connected to tool rotary axis |
| 11/21/1991 | EP0457563A2 Slant rig cementing apparatus |
| 11/16/1991 | CA2042557A1 Lift through plug container for slant rig |
| 10/29/1991 | US5060735 Device for positioning of a drill bit |
| 10/17/1991 | WO1991015655A1 Rock bed excavator |
| 09/24/1991 | US5050673 Lift through plug container for slant rig |
| 09/04/1991 | CN2084101U Drilling derrick base of middle or deep well |
| 08/21/1991 | CN2083185U Surge tank device of heavy derrick |
| 08/13/1991 | US5038871 Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a well |
| 08/08/1991 | DE4002947A1 Derrick rig for installation, dismantling and other work at boreholes - reduces working time, is light and compact, and can be a fixture or mobile |
| 07/31/1991 | EP0439080A1 Earth-drilling device |
| 07/31/1991 | CA2008974A1 Rig for round trip operations at a well |
| 07/09/1991 | CA1285930C Drilling derrick device |
| 06/26/1991 | EP0434652A1 Rock drilling rig |
| 06/25/1991 | CA1285265C Drilling boom |
| 06/21/1991 | CA2031559A1 Rock drilling rig |
| 05/30/1991 | WO1991007616A1 A hose and cable conveyor |
| 05/21/1991 | US5016942 Anchor boring unit |
| 05/02/1991 | EP0424779A1 Self-propelled equipment to bore in tunnels |
| 05/02/1991 | EP0424768A1 Device to feed reinforcement rods |
| 05/02/1991 | EP0424733A1 Device to load reinforcement rods |
| 04/24/1991 | CN2075692U Inverted u type telescopic derrick |
| 04/17/1991 | CN2075255U Ordinary h shaped steel derrick |
| 04/16/1991 | US5007492 Safety stabilizer for auger |
| 03/13/1991 | EP0417055A1 Device for positioning of a drill bit |
| 02/20/1991 | CN1011720B Lifting apparatus for drilling |
| 01/15/1991 | US4984936 Stopper apparatus for rotary reaction force |
| 01/15/1991 | CA1278959C Bearing structure and a floating vessel comprising such structure |
| 12/25/1990 | US4979575 Method of drilling a hole-in a rock |
| 11/27/1990 | US4973198 Offshore drilling rig transfer |
| 11/22/1990 | EP0397858A1 Apparatus for forming slit in base rock and concrete surface |
| 10/11/1990 | DE4009979A1 Mast for mobile drilling rig - has support struts which can be extended laterally for stability when drilling |
| 10/09/1990 | US4961562 Apparatus for engaging beams |
| 10/09/1990 | US4961468 Multi-function control actuating mechanism |
| 09/07/1990 | WO1990010140A1 Device for manipulation control of a movable object |
| 07/26/1990 | DE3902127A1 Wagon drill with laser-orientated control |
| 07/25/1990 | EP0379187A1 Method of pulling outer tubings |
| 06/27/1990 | CN2058691U Device for supporting sideroom of floating drilling platform |
| 06/13/1990 | CN1008383B Method for producing a tubular node |
| 06/13/1990 | CN1008382B Pile driver, pile drawer and/or drilling machine |
| 06/12/1990 | US4932175 Telescopic drilling derrick apparatus |
| 06/08/1990 | CA2002983A1 Telescopic drilling derrick apparatus |
| 05/16/1990 | EP0367889A1 Tilt mechanism for truck-mounted drilling machines |
| 05/09/1990 | CN2056936U Safe operating platform of derrick for repairing well |
| 04/05/1990 | DE3926778A1 Flanschverbindung fuer traeger einer fachwerkkonstruktion Flange for traeger a truss construction |
| 02/21/1990 | CN1039870A Arrangement for operating hydraulic actuating means in rock boom and like boom construction |
| 02/20/1990 | US4901805 Unit for borehole running and pulling operations |
| 02/13/1990 | US4899832 Modular well drilling apparatus and methods |
| 02/07/1990 | CN1039465A Method of and arrangement for drilling hole in rock |
| 02/01/1990 | DE3924469A1 Anordnung zur betaetigung hydraulischer bedienungsgeraete eines gesteinsbohrarms oder einer aehnlichen bohrarmkonstruktion Arrangement for actuating hydraulic equipment at a user-gesteinsbohrarms or similar bohrarmkonstruktion |
| 01/30/1990 | CA1265124A1 Modular drilling machine and components thereof |
| 01/24/1990 | EP0351694A2 Stopper apparatus for rotary reaction force |
| 01/03/1990 | CN2050467U Sunk-proof metal basement for drilling rig in desert |
| 12/26/1989 | US4889191 Gooseneck assembly for rock drill and method for inserting friction rock stabilizer |
| 12/14/1989 | DE3917931A1 Verfahren und anordnung zum bohren eines lochs in einen felsen Method and arrangement for drilling a hole in a rock |
| 12/12/1989 | US4885893 Well mast structure |
| 11/22/1989 | CN2048107U Regulator for the derrick base |