| Patents for G01V 13 - Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups (988) |
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| 12/26/1995 | US5477921 Method and system for logging a well while fishing for the logging tool |
| 11/14/1995 | US5467019 Method and apparatus for balancing the electrical output of the receiver coils of an induction logging tool by use of a slidable magnetic rod for eliminating direct coupling |
| 10/26/1995 | DE4414748A1 Proximity sensor for contactless inductive or capacitive switch |
| 09/27/1995 | EP0673479A1 Mechanical linear guide. |
| 09/12/1995 | US5450059 Detection system and method for the verification of the functioning of the detection system by instantaneous comparison of the state of a node on a receptor and a node on a detector |
| 06/14/1995 | EP0657032A1 Dual sensitivity stud sensor |
| 06/13/1995 | CA2033609C Long feature vertical or horizontal electrical conductor detection methodology using phase coherent electromagnetic instrumentation |
| 05/18/1995 | DE4338978A1 Detecting defective light grid sources and/or receivers |
| 04/19/1995 | EP0648342A1 Method and apparatus for calibrating an mwd electromagnetic logger |
| 02/01/1995 | EP0505372B1 Process and device for testing a hall sensor system |
| 01/24/1995 | US5384752 Method for correcting a seismic source pulse waveform |
| 10/04/1994 | US5352974 Stud sensor with digital averager and dual sensitivity |
| 09/21/1994 | CN1092526A Detection system with receptor and process for the implementation of a device to verify the functioning of this detection system |
| 09/14/1994 | CN2177248Y Seismograph monthly inspecting processor |
| 07/13/1994 | EP0372059B1 Apparatus and method for leveling a gravity measurement device |
| 06/23/1994 | WO1994013976A1 Mechanical linear guide |
| 05/11/1994 | WO1994010585A1 A method for determining the far-field signature of a marine seismic source array |
| 04/06/1994 | EP0590349A2 Magnetometer probe |
| 03/08/1994 | US5293128 Method and apparatus for calibrating the output measurement of a logging tool as a function of earth formation parameters |
| 03/03/1994 | WO1994004932A1 Dual sensitivity stud sensor |
| 01/20/1994 | WO1994001791A1 Method and apparatus for calibrating an mwd electromagnetic logger |
| 01/11/1994 | US5278549 Wireline cycle life counter |
| 12/29/1993 | EP0575912A1 Method and device for verifying functioning of a detection system with sensor |
| 11/09/1993 | US5260660 Method for calibrating a downhole receiver used in electromagnetic instrumentation for detecting an underground conductor |
| 10/07/1993 | DE4213121C1 Sonar appts. testing device used for under water surveillance - uses test generators and evaluation device connected in sequence to each transducer group and associated amplifier |
| 09/21/1993 | US5247486 Method for determining the far-field signature of a plurality of seismic sources |
| 09/14/1993 | US5245178 Apparatus for automatically testing safety light curtain and measuring machine stoppage time |
| 08/11/1993 | EP0555148A1 Process for determining the far-field signature of a plurality of seismic sources |
| 05/11/1993 | US5210718 Calibration of seismic streamers in a helmholz resonator |
| 04/14/1993 | CN2129935Y Test device for earth-quake wave detector |
| 03/31/1993 | EP0534648A1 Method of marine seismic exploration |
| 03/28/1993 | CA2079179A1 Method for correcting impulse response differences of hydrophones and geophones as well as geophone coupling to the water-bottom in dual-sensor, bottom-cable seismic operations |
| 02/17/1993 | CN2127177Y Geophone testing instrumnet with microcomputer |
| 02/09/1993 | US5185578 Method for detecting anomalous geological zones by transmitting electromagnetic energy between spaced drillholes using different frequency ranges |
| 02/03/1993 | EP0525155A1 Apparatus for testing a phased array of transducers |
| 11/10/1992 | US5163028 Method for correcting impulse response differences of hydrophones and geophones as well as geophone coupling to the water-bottom in dual-sensor, bottom-cable seismic operations |
| 11/03/1992 | US5160885 Metal detecting apparatus and apparatus including guide housing for guiding a metal test piece, for testing metal detecting apparatus |
| 09/03/1992 | WO1992015027A1 Apparatus for testing a phased array of transducers |
| 08/04/1992 | CA1306033C Walk-through metal detector |
| 06/09/1992 | US5121362 Geophone checker |
| 05/12/1992 | US5113375 Method and apparatus for testing geophones |
| 04/28/1992 | CA1299724C Device for borehole sismic data acquisition and transmission to a central monitoring and recording system |
| 03/10/1992 | US5095464 Hydrophone checker |
| 11/19/1991 | US5066917 Long feature vertical or horizontal electrical conductor detection methodology using phase coherent electromagnetic instrumentation |
| 08/27/1991 | US5043666 Self-calibrating electromagnetic field sensor for locating buried conduits |
| 07/31/1991 | CN2081883U Cable bridle for well survey |
| 07/24/1991 | CN1013312B Apparatus for collecting and transmitting seismic data while drilling |
| 06/27/1991 | WO1991009320A1 Process and device for testing a hall sensor system |
| 06/20/1991 | DE3941473A1 Verfahren und vorrichtung zur ueberpruefung eines hall-sensorsystems Method and apparatus for inspecting a hall-sensor systems |
| 03/20/1991 | EP0418069A2 Metal detecting apparatus and apparatus for testing metal detecting apparatus |
| 03/19/1991 | US5001675 Phase and amplitude calibration system for electromagnetic propagation based earth formation evaluation instruments |
| 12/05/1990 | EP0400769A2 Real-time simulation of the far-field signature of a seismic sound source array |
| 11/13/1990 | US4970695 In situ calibration of a sensor |
| 09/19/1990 | EP0388315A1 Process and device for logging using a sensor making a circumferential sweep of the wall of the borehole, in particular to calibrate this sensor |
| 09/18/1990 | CA1274294A1 Metal detector testing process and apparatus |
| 06/26/1990 | CA1270937A1 Method and device for determining the long range emission signature of a set of seismic emissions |
| 06/19/1990 | US4935883 Apparatus and method for leveling a gravity measurement device |
| 05/15/1990 | US4926127 Apparatus for the detection of metal objects located within a poor electrically conductive environment |
| 04/18/1990 | CN1007660B Instrument for calibrating gravimeter |
| 03/13/1990 | US4908801 Real-time simulation of the far-field signature of a seismic sound source array |
| 03/13/1990 | US4908800 Multi-channel acoustic simulator |
| 11/30/1989 | WO1989011666A1 Apparatus and method for leveling a gravity measurement device |
| 10/24/1989 | US4876511 Method and apparatus for testing and calibrating an electromagnetic logging tool |
| 09/19/1989 | US4868794 Method of accumulation data for use in determining the signatures of arrays of marine seismic sources |
| 09/05/1989 | US4864546 Vibrator seismic data correlation system |
| 08/29/1989 | US4862425 Device for acquiring seismic data in a borehole and transmission thereof to a central control and recording system |
| 07/12/1989 | EP0323713A2 Walk-through metal detector |
| 06/06/1989 | US4836682 Method and apparatus for calibrating optical sensors |
| 05/16/1989 | US4831362 Failure detection system for a metallic debris detection system |
| 05/02/1989 | US4827456 Method and device for determining the remote emission signature of a seismic emission assembly |
| 04/11/1989 | US4821023 Walk-through metal detector |
| 01/25/1989 | EP0300974A1 Inductive sensor device |
| 01/24/1989 | US4800496 Method for determining induction sonde error |
| 10/19/1988 | CN88101902A Apparatus for collecting seismic data and transmitting it to centre system of control and record while drilling |
| 10/05/1988 | EP0285519A1 Apparatus for borehole seismic data acquisition and their transmission to a central control and recording system |
| 08/24/1988 | EP0279190A2 Inductive detection apparatus |
| 07/19/1988 | US4757706 Geophone testing |
| 06/30/1988 | DE3643736A1 Stationary measuring device for measuring flow noise at acoustic underwater trailing (drag) antennas |
| 06/28/1988 | US4754438 Geophone testing apparatus |
| 03/30/1988 | EP0093767B1 Method for determining source and receiver statics in marine seismic exploration |
| 02/23/1988 | US4726434 Metal detector testing process and apparatus in a combination weighing system |
| 02/10/1988 | EP0255777A2 Metal detector testing process and apparatus |
| 12/15/1987 | CA1230403A1 Method for determining the far field signature of a marine seismic source from near field measurements |
| 12/12/1987 | CN86210206U Quick disassemble mechanism for strong radioactive source of well testing instrument |
| 09/15/1987 | US4693336 Underwater seismic testing |
| 09/08/1987 | CA1226621A1 Remote calibration for acoustic transducer array |
| 06/16/1987 | US4672837 Test system for walk-through metal detector |
| 04/14/1987 | US4658384 Method for determining the far-field signature of an air gun array |
| 04/07/1987 | US4656615 Hydrophone array polarity test circuit |
| 03/03/1987 | US4648080 Method for determining the far field signature of a marine seismic source from near-field measurements |
| 03/03/1987 | US4648079 Method of troubleshooting an underwater acoustic transducer array |
| 03/03/1987 | US4648078 Remote calibration of acoustic transducer array |
| 02/03/1987 | US4641091 Device for testing and calibrating treasure hunting metal detectors |
| 01/27/1987 | US4639901 Method for testing cableless seismic digital field recorders |
| 01/27/1987 | US4639666 Metal detector sensitivity adjustment and test assembly |
| 12/30/1986 | CA1216055A1 Seismic signal generator |
| 12/10/1986 | EP0204599A1 Process and device for determining from a great distance the signature of a group of seismic emitters |
| 12/03/1986 | EP0203227A1 Method and apparatus for analysing geophones |
| 09/23/1986 | US4613821 Method and apparatus for obtaining high accuracy simultaneous calibration of signal measuring systems |
| 07/15/1986 | US4600882 Sensitivity recalibration system for body search metal detectors |