| Patents for G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation (25,929) |
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| 03/14/1989 | US4811665 Magnetic sensor arrangement |
| 03/07/1989 | US4811220 Method for visual display and analysis of subsurface rock properties and structure utilizing colored magnetotelluric transfer functions |
| 03/07/1989 | US4811030 Marker for subterranean marking and a novel application for such a marker |
| 03/07/1989 | US4810970 Oil-based flushed zone electromagnetic well logging system and method |
| 03/07/1989 | US4810966 Inductive sensor arrangement and measuring arrangement for use thereof |
| 03/07/1989 | US4810957 Device for sensing the number of items stored in a compartment |
| 03/07/1989 | CA1303128B Method for constructing vertical images of anomalies in geological formations |
| 03/07/1989 | CA1250893A1 Method for constructing vertical images of anomolies in geological formations |
| 03/02/1989 | DE3817024A1 Method for monitoring wire stapling in book binding machines |
| 03/01/1989 | EP0305013A2 Inductive proximity sensor |
| 03/01/1989 | EP0181392B1 Interferometric radiometer |
| 02/28/1989 | US4808929 Shielded induction sensor for well logging |
| 02/28/1989 | US4808925 Three magnet casing collar locator |
| 02/28/1989 | CA1250635A1 Apparatus for detecting metal debris particles |
| 02/22/1989 | EP0304272A2 Inductive proximity sensor |
| 02/22/1989 | EP0303653A1 Method and apparatus for locating opposite points on the two sides of a planar element such as a structural barrier |
| 02/21/1989 | US4806882 Oscillator/demodulator circuit for an inductive proximity switch |
| 02/21/1989 | US4806869 An above-ground arrangement for and method of locating a discrete in ground boring device |
| 02/21/1989 | US4806865 Device for measuring the earth's magnetic field disturbed by anomalies |
| 02/21/1989 | US4805266 Apparatus for detecting foreign bodies in a mass of textile fibers |
| 02/15/1989 | CN2032727U Magneto-sensor |
| 02/14/1989 | US4804918 For detection/measurement of a petroleum reservoir |
| 02/08/1989 | EP0302408A2 Plastic pipe assembly |
| 02/08/1989 | CN1030982A Electric measuring method of depth under well |
| 02/08/1989 | CN1030959A Extended range, pulsed induction logging tool and method of use |
| 02/02/1989 | DE3824043A1 Arrangement for the generation of signals |
| 02/01/1989 | EP0301671A2 Method of magnetizing well tubulars |
| 01/26/1989 | WO1989000705A1 Multi-array borehole resistivity and induced polarization system |
| 01/26/1989 | WO1989000702A1 Magnetic sensor |
| 01/25/1989 | EP0300974A1 Inductive sensor device |
| 01/24/1989 | CA1249332A1 Non-polarizable electrode |
| 01/24/1989 | CA1249331A1 Method for analyzing thinly bedded sand/shale formations |
| 01/12/1989 | WO1989000295A1 Systems and methods for sensing position and movement |
| 01/10/1989 | US4797618 Caddy for metal detector |
| 01/03/1989 | US4796186 Conductivity determination in a formation having a cased well |
| 01/03/1989 | US4796013 Personnel detector |
| 01/03/1989 | US4795995 Method and apparatus for producing electromagnetic surveillance fields |
| 12/27/1988 | US4794322 Method, system, and tool for investigating borehole casings |
| 12/22/1988 | DE3718378A1 Method for identifying pipes, irons or cables laid under plaster when carrying out drilling operations on walls, ceilings or floors, and device for carrying out the method |
| 12/20/1988 | US4792804 Apparatus for detecting a body in motion on the ground of a protected area |
| 12/20/1988 | US4792761 Geophysical prospecting with collimated magnetotelluric fields |
| 12/20/1988 | US4792757 Oil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well bores |
| 12/20/1988 | CA1247195A1 Method and system for primary field compensation in a towed receiver for airborne electromagnetic survey systems |
| 12/15/1988 | WO1988009940A1 Extended range, pulsed induction logging tool and method of use |
| 12/14/1988 | EP0295134A2 Nuclear magnetic resonance sensing apparatus and methods |
| 12/14/1988 | EP0294414A1 Synthetically focused resistivity method and apparatus for detecting subsurface cavities |
| 12/13/1988 | US4791373 Subterranean target location by measurement of time-varying magnetic field vector in borehole |
| 12/13/1988 | CA1246673A1 Electromagnetic array profiling survey method |
| 12/07/1988 | EP0294225A2 Apparatus for measuring the formation resistivity in earth strata |
| 12/07/1988 | EP0294159A1 Branched sensor system |
| 12/01/1988 | WO1988009515A1 Locating process for localizing unknown receiver or transmitter positions |
| 12/01/1988 | WO1988009498A1 Pipeline coating survey equipment |
| 11/24/1988 | DE3716846A1 Method of monitoring areas, in particular garbage (rubbish) dumps (landfills), dams, dykes or the like |
| 11/22/1988 | US4786874 Resistivity sensor for generating asymmetrical current field and method of using the same |
| 11/22/1988 | US4786873 Method for evaluating water saturation in petroleum reservoirs from dielectric permittivity |
| 11/22/1988 | EP0195070A4 Method and apparatus for producing electromagnetic surveillance fields. |
| 11/22/1988 | CA1245286A1 Dielectric well logging system for invaded formations |
| 11/17/1988 | WO1988008991A1 Magnetic locating and tracing system and method using dual-antenna transmitter |
| 11/17/1988 | EP0290811A2 Device for measuring the magnitude and direction of a magnetic field, especially of the earth-magnetic field |
| 11/17/1988 | EP0113736B1 A method and apparatus for determining the trace and depth of underground metallic conductors |
| 11/15/1988 | US4785247 Drill stem logging with electromagnetic waves and electrostatically-shielded and inductively-coupled transmitter and receiver elements |
| 11/15/1988 | US4784762 Hall effect sensor mounted to non-ferrous sheet to detect debris |
| 11/15/1988 | CA1244919A1 Microwave reflection survey equipment and technique |
| 11/15/1988 | CA1244885A1 Flux gate sensor |
| 11/15/1988 | CA1244881A2 Electrode and assembly for induced-polarization prospecting |
| 11/15/1988 | CA1244880A1 In-situ method for determining pore size distribution, capillary pressure and permeability |
| 11/10/1988 | DE3813479A1 Einrichtung zur genauen lokalisierung von ferromagnetischem material in biologischem gewebe Means for accurate localization of ferromagnetic materials in biological tissue |
| 11/10/1988 | DE3714009A1 Metalldetektor Metal Detector |
| 11/10/1988 | DE3713363A1 Detecting device for detecting metal parts |
| 11/09/1988 | CN88202425U Automatic controller for taking photograph on well bottom |
| 11/08/1988 | US4783630 In an induction balance transmit/receive type |
| 11/02/1988 | EP0289418A2 Induction logging method and apparatus |
| 11/02/1988 | EP0288578A1 Method of detecting object and apparatus therefor |
| 11/01/1988 | CA1244083A1 Instrument for sensing ferromagnetic bodies |
| 10/25/1988 | US4780679 Method for determining low frequency conductivity of subsurface formations |
| 10/25/1988 | US4780678 Apparatus for microinductive investigation of earth formations |
| 10/25/1988 | US4779702 Arrangement for the switching of devices in motor vehicles |
| 10/19/1988 | EP0287320A2 Method of and apparatus for measuring inhomogeneities on the wall of boreholes in formations pierced by a borehole |
| 10/19/1988 | CN87107286A Method and apparatus for detecting counterfeit articles |
| 10/18/1988 | US4779048 Metal detector for detecting metal objects |
| 10/12/1988 | EP0286518A1 Method and system for acquisition and segregation of the effects of simultaneously arising sources of electromagnetic field and their application to prediction of earthquakes |
| 10/12/1988 | EP0286146A2 End sensor |
| 10/11/1988 | CA1243076A1 Apparatus for microinductive investigation of earth formations |
| 10/11/1988 | CA1243075A1 Apparatus for microinductive investigation of earth formations |
| 10/06/1988 | WO1988007732A1 Microwave proximity sensor |
| 10/06/1988 | DE3708968A1 Device for determining the routing of cables |
| 10/05/1988 | EP0285473A1 Flapper pad arrangement for logging sonde |
| 10/04/1988 | US4775832 Conductor tracer transmitter with non-reversing magnetic field tracing signal |
| 09/27/1988 | US4774471 Complex dielectric constant well logging means and method for determining the water saturation and the water resistivity of an earth formation |
| 09/27/1988 | US4774470 Shield tunneling system capable of electromagnetically detecting and displaying conditions of ground therearound |
| 09/27/1988 | US4774469 Method of determining the mineral composition of ore bodies in rock mass |
| 09/27/1988 | CA1242535A1 Method for evaluation of formation invasion and formation permeability |
| 09/22/1988 | WO1988007212A1 Well logging system employing focused current in measuring resistivity while drilling |
| 09/21/1988 | EP0283291A2 Differential magnetic proximity detector |
| 09/21/1988 | EP0282967A2 Sensor for detecting variation in magnetic field |
| 09/15/1988 | DE3707100A1 Measured value indicator for measuring devices |
| 09/14/1988 | CN87103456A Measuring method and device through obstacle |
| 09/13/1988 | US4771246 Method for determining the location of a leak in a pond liner formed of electrically insulating material |
| 09/07/1988 | EP0281469A2 Device particularly suited for the use of a small-diameter borehole probe in large-diameter boreholes |
| 09/07/1988 | EP0281014A2 Inductive metal detector |