| Patents for E21B 12 - Accessories for drilling tools (993) |
|---|
| 03/27/1990 | US4911252 Rock bit loose cone indicator |
| 02/20/1990 | US4903245 Downhole vibration monitoring of a drillstring |
| 12/12/1989 | US4886129 Test procedure |
| 11/28/1989 | US4884071 Wellbore tool with hall effect coupling |
| 11/22/1989 | CN2048106U Supporter for turbine drilling tool |
| 10/31/1989 | US4876886 Method for detecting drilling events from measurement while drilling sensors |
| 10/11/1989 | EP0336491A1 Method for detecting drilling events from measurement while drilling sensors |
| 10/11/1989 | EP0336477A1 Method of determining drill bit wear |
| 09/06/1989 | EP0330829A1 Method and device for taking soil samples |
| 08/16/1989 | EP0327667A2 Method and device for taking soil samples |
| 04/25/1989 | CA1253231A1 Method of analyzing vibrations from a drilling bit in a borehole |
| 04/12/1989 | CN1032377A Suspended well-drilling technology and its apparatus |
| 03/29/1989 | EP0203978B1 Process and system for monitoring wheel-type boring machines |
| 03/23/1989 | DE3830972A1 Rotary drilling tool |
| 03/22/1989 | EP0308327A1 Method for determining the wear of a tool cutter while drilling rock formations |
| 03/07/1989 | CA1250826A1 Assessment of drilling conditions |
| 02/22/1989 | CN2033046U Sand blower with water and gas dual-purpose |
| 02/15/1989 | CN1003288B Noise eliminating device for drill |
| 12/21/1988 | CN87214023U Pneumatic mud scraper for drilling tool |
| 11/22/1988 | US4785895 Drill bit with wear indicating feature |
| 11/22/1988 | US4785894 Apparatus for detecting drill bit wear |
| 09/27/1988 | US4773263 Method of analyzing vibrations from a drilling bit in a borehole |
| 08/31/1988 | CN87213742U Sealing scraper |
| 07/13/1988 | EP0274342A1 Device for detecting disc cutter wear at roller bit drilling tools |
| 06/14/1988 | CA1237952A1 Method and apparatus for detecting wear of a rotatable bit |
| 03/29/1988 | US4733789 Shipping container |
| 03/15/1988 | US4730681 Preventing wear-induced dislodgement |
| 02/03/1988 | CN87208513U Drill set aligner |
| 01/12/1988 | CA1231448A1 Drilling monitor |
| 11/10/1987 | US4704895 Method and device for monitoring roller drilling tools |
| 09/23/1987 | EP0237867A2 Changeover bit for extended life, varied formations and steady wear |
| 09/22/1987 | US4695957 Drilling monitor with downhole torque and axial load transducers |
| 09/01/1987 | US4690228 Changeover bit for extended life, varied formations and steady wear |
| 08/25/1987 | US4688647 Drill bit having a failure indicator |
| 08/11/1987 | US4685329 Assessment of drilling conditions |
| 04/15/1987 | EP0218328A2 Methods of analyzing vibrations from a drilling bit in a borehole |
| 04/07/1987 | US4655300 Method and apparatus for detecting wear of a rotatable bit |
| 03/17/1987 | US4650012 Apparatus for cleaning drills |
| 01/20/1987 | US4637659 Tool member for a rotary drilling tool |
| 01/14/1987 | CN86202125U Spiral mud-scraping appliance with a starfish appearance |
| 12/10/1986 | EP0203978A1 Process and system for monitoring wheel-type boring machines. |
| 12/09/1986 | US4627276 Method for measuring bit wear during drilling |
| 10/08/1986 | CN85100480A Noise eliminating device for drill |
| 09/09/1986 | US4610313 Drill bit having a failure indicator |
| 08/12/1986 | CA1209570A1 Air groove scraper |
| 07/22/1986 | US4601354 Means and method for facilitating measurements while coring |
| 06/19/1986 | WO1986003543A1 Process and system for monitoring wheel-type boring machines |
| 01/22/1986 | EP0168996A1 Drilling monitor |
| 12/04/1985 | EP0163426A1 Assessment of drilling conditions |
| 10/22/1985 | US4548280 Drill bit having a failure indicator |
| 05/08/1985 | EP0140253A1 Tool body for a rotary drilling tool |
| 05/07/1985 | US4515228 Earth boring bit |
| 04/23/1985 | CA1185963A1 Well tool |
| 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 |
| 09/25/1984 | US4473125 Insert for drill bits and drill stabilizers |
| 09/18/1984 | CA1174665A1 Abradable cutter protection |
| 04/17/1984 | US4443206 Well tool |
| 03/13/1984 | US4436164 Lubrication failure detection system |
| 02/07/1984 | US4429754 Method and apparatus for clearing earth drill cuttings from around drill holes |
| 12/13/1983 | US4420253 Method and apparatus for detecting wear or breakage of tools and other objects |
| 11/01/1983 | US4412462 Drill adjusting tool |
| 08/17/1983 | EP0086101A2 Well tool |
| 08/09/1983 | US4397361 Abradable cutter protection |
| 12/21/1982 | US4364441 Hole cleaning device for augers |
| 12/08/1982 | EP0066435A1 Drill bit having abradable cutter protection |
| 08/31/1982 | US4346591 Sensing impending sealed bearing and gage failure |
| 08/03/1982 | CA1128769A1 Stress measuring device on the coupling of a working drill string |
| 03/02/1982 | US4317585 Torqued drill pipe identification |
| 10/13/1981 | US4294318 Device for measuring the stresses applied in use to the downhole assembly of a drill pipe |
| 09/22/1981 | US4290498 Ablatible drill |
| 04/07/1981 | US4260030 Well tool |
| 03/03/1981 | US4253533 Variable wear pad for crossflow drag bit |
| 01/13/1981 | US4244469 Protective carrying case for drill bits |
| 08/05/1980 | CA1083132A1 Method and system for determining formation porosity |
| 05/20/1980 | CA1077921A1 Device for exposing worn carbide tips in drill bits |
| 02/19/1980 | US4189012 Earth boring tool |
| 10/02/1979 | US4169483 Hydraulic jet drill stem and bit unplugging device |
| 09/11/1979 | CA1062240A1 Spring adjustment system for drill string tool |
| 12/19/1978 | US4130170 Probe for use in geological surveys |
| 11/14/1978 | US4125167 Big hole bit |
| 10/03/1978 | US4117896 Soil sampler |
| 09/19/1978 | US4114704 Down hole well drilling tool with reversible thrust bearings |
| 08/15/1978 | US4106576 Sampling tube cleaning device |
| 08/08/1978 | US4105083 Large diameter drill bit |
| 07/04/1978 | US4098360 Soil sample core extraction tool |
| 03/28/1978 | US4080708 Method of repairing a dredge cutterhead |
| 12/27/1977 | US4064749 Method and system for determining formation porosity |
| 11/08/1977 | US4057117 Auger spoil disposal box |
| 06/21/1977 | US4030558 Wear determination of drilling bits |
| 05/10/1977 | US4022286 Auger |
| 07/13/1976 | US3968846 Auger wiper |
| 01/27/1976 | US3934659 Apparatus for drilling holes in earth surface |