| 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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| 02/04/1987 | EP0210946A2 Roller table for a rolling mill of flat products |
| 02/03/1987 | US4641100 Multifrequency method for direct airborne electromagnetic prospecting of hydrocarbon deposits |
| 02/03/1987 | US4641099 Controlled source audio frequency magnetotelluric techniques |
| 01/29/1987 | DE3526492A1 Device for locating/detecting metal |
| 01/27/1987 | US4639675 Superconducting conductivity anomaly detection system |
| 01/27/1987 | US4639674 Apparatus and method employing extraneous field compensation for locating current-carrying objects |
| 01/27/1987 | CA1217255A1 Inductive loop detectings system and the process for the application thereof |
| 01/27/1987 | CA1217231A1 Device for transmitting to the surface the signal from a transmitter located at a great depth |
| 01/24/1987 | CN86102593A Detector for measuring depth of coal bed |
| 01/20/1987 | US4638294 Unauthorized entry detection system |
| 01/20/1987 | US4638262 Proximity switch with improved response time and antimagnetic field circuitry |
| 01/20/1987 | US4638254 Method of determining and displaying the orientation of subsurface formations |
| 01/20/1987 | CA1216892A1 Deep penetration well logging system and method |
| 01/20/1987 | CA1216891A1 Variable frequency induction well logging method and apparatus |
| 01/15/1987 | WO1987000025A1 Electromagnetic bone healing sensor |
| 01/14/1987 | EP0208214A2 A metal detector |
| 01/13/1987 | US4636731 Propagation anisotropic well logging system and method |
| 01/07/1987 | EP0207372A1 Oscillator/demodulator circuit arrangement for an inductive proximity switch |
| 01/07/1987 | CN86104310A 金属检测器 Metal Detector |
| 01/06/1987 | US4634975 Method and apparatus for producing electromagnetic surveillance fields |
| 01/06/1987 | US4634974 Device including moveable shaft and magnet for sensing magnetic metal |
| 12/31/1986 | WO1986007637A1 Magnetic field-dependent, inductive proximity switch |
| 12/30/1986 | US4633182 Electrical geophysical system |
| 12/30/1986 | EP0206706A2 Measurement of electrical resistivity in borehole |
| 12/30/1986 | EP0052128B1 Apparatus and method for image reproduction of materials using their magnetic and electric properties |
| 12/30/1986 | CA1216025A1 Method and apparatus for reducing groeningen effect errors in resistivity measurements of an earth formation |
| 12/23/1986 | CA1215743A1 Method and apparatus for indicating the presence of conductive material in a medium |
| 12/17/1986 | CN85104704A Apparatus for the detection and analysis of anomalies within geological formations |
| 12/16/1986 | US4630243 Apparatus and method for logging wells while drilling |
| 12/16/1986 | US4629990 Method and apparatus for correcting the relative motion of a transmitter and a receiver in airborne electromagnetic prospecting |
| 12/16/1986 | US4629986 Nuclear magnetic loggins |
| 12/09/1986 | US4628266 Apparatus for direct airborne electromagnetic prospecting of hydrocarbon deposits. |
| 12/09/1986 | US4628265 Metal detector and classifier with automatic compensation for soil magnetic minerals and sensor misalignment |
| 12/09/1986 | CA1215116A1 Deep penetration well logging system and means |
| 12/02/1986 | US4626785 Focused very high frequency induction logging |
| 12/02/1986 | CA1214826A1 Detector |
| 11/26/1986 | EP0202320A1 A method for radar mapping an area and a radar equipment to carry out the method. |
| 11/26/1986 | CN85104108A Apparatus for microinductive investigation of earth formations |
| 11/25/1986 | US4625173 System for monitoring formation spontaneous potential and polarization constant while drilling |
| 11/25/1986 | US4625172 Apparatus for supplying AC current to an underwater cable |
| 11/25/1986 | CA1214519A1 Method and system for direct prospecting of hydrocarbon deposits |
| 11/20/1986 | EP0201621A2 Electromagnetic instruments and survey procedures for imaging structure in coal seams |
| 11/11/1986 | US4622518 Deep penetration well logging system and method using secondary electromagnetic fields |
| 11/06/1986 | WO1986006501A1 Method and device for detecting underground cables |
| 11/06/1986 | WO1986006364A1 Method and apparatus for detecting metals |
| 10/29/1986 | EP0198985A1 Induction logging sonde with metallic support |
| 10/29/1986 | EP0198910A1 Process and device for detecting slag. |
| 10/29/1986 | CN85103932A Induction logging sonde with metallic support |
| 10/29/1986 | CN85102863A Object-detecting method and system |
| 10/28/1986 | US4620152 Lift-off compensation of eddy current probes by translating without rotation the X-Y coordinate plot of the complex locus of the probe output |
| 10/22/1986 | EP0198638A2 Oil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well bores |
| 10/21/1986 | US4618835 Proximity sensor oscillator utilizing controlled charge |
| 10/21/1986 | US4618828 Insulating segment for a drill string electrode structure |
| 10/14/1986 | US4617518 Method and apparatus for offshore electromagnetic sounding utilizing wavelength effects to determine optimum source and detector positions |
| 10/14/1986 | US4617517 Determination of water saturation in earth formations independent of lithology |
| 10/14/1986 | CA1212782A1 Method for identifying complex lithologies in a subsurface formation |
| 10/14/1986 | CA1212721A1 Method and means for interferometric high frequency induction logging |
| 10/07/1986 | US4616184 CSAMT method for determining depth and shape of a sub-surface conductive object |
| 09/30/1986 | US4614250 Logging method and apparatus using a sonde equipped with measuring pads |
| 09/24/1986 | EP0195070A1 Method and apparatus for producing electromagnetic surveillance fields |
| 09/24/1986 | EP0165256A4 Object detector. |
| 09/23/1986 | US4613830 Proximity switch having variable gain oscillator |
| 09/23/1986 | US4613821 Method and apparatus for obtaining high accuracy simultaneous calibration of signal measuring systems |
| 09/23/1986 | US4613815 Electromagnetic detector for metallic materials having an improved phase detection circuit |
| 09/23/1986 | US4613812 Microwave detection system |
| 09/16/1986 | CA1211493A1 Copy machine with document dependent control |
| 09/12/1986 | WO1986005278A1 Dielectric methods and apparatus for in-situ soil classification |
| 09/09/1986 | US4611173 Induction logging system featuring variable frequency corrections for propagated geometrical factors |
| 09/09/1986 | US4611169 Sensor for measuring relative movement between a vehicle and a track by sensing magnetic field distortions |
| 09/09/1986 | CA1211156A1 Borehole measuring apparatus |
| 09/02/1986 | US4609882 Oscillator/demodulator circuit arrangement for an inductive proximity switch |
| 09/02/1986 | US4609873 Dielectric well logging system with at least three transmitter coils and at least two receiver coils for determining resistivity and dielectric constant of a subsurface formation adjacent a fluid invaded zone of the formation |
| 08/27/1986 | EP0191996A1 Resistivity surveying apparatus |
| 08/19/1986 | CA1210063A1 Method and apparatus for extended lateral range electrical conductivity logging |
| 08/19/1986 | CA1210062A1 Apparatus and method for logging wells while drilling |
| 08/13/1986 | EP0190481A1 Nuclear magnetic resonance method and apparatus for remote detection and volumetric measurement of petroleum reserves |
| 08/12/1986 | US4605898 Pulse field metal detector with spaced, dual coil transmitter and receiver systems |
| 08/05/1986 | US4604581 Method and apparatus for deconvolving apparent conductivity measurements in induction well logging |
| 08/05/1986 | CA1209208A1 Method and apparatus for producing an image log of a borehole wall penetrating an earth formation |
| 07/30/1986 | CN85100124A Annular laser magnetometer |
| 07/29/1986 | US4603297 Logging device loaded with dielectric material to minimize spurious transverse magnetic mode components |
| 07/29/1986 | US4603295 Two-headed DC magnetic target proximity sensor |
| 07/29/1986 | US4602768 Apparatus for determining the presence of a metallic melt in a passage channel of a metallurgical furnace or of a casting ladle |
| 07/29/1986 | CA1208738A1 Protected sensor for granular materials |
| 07/23/1986 | EP0187810A1 Methods and apparatus employing spontaneous resonance |
| 07/22/1986 | US4602215 Electromagnetic field method of detecting contemporary geodynamic movements in massif |
| 07/22/1986 | US4601100 For measuring a downhole characteristics in a well |
| 07/17/1986 | WO1986004154A1 Method of geophysical surveying polymictic ore bodies |
| 07/16/1986 | EP0187583A2 Electromagnetic logging apparatus with button antennas |
| 07/16/1986 | EP0187419A2 Device for detecting air gaps in liquid product pieces |
| 07/15/1986 | US4600887 Microwave electromagnetic borehole dipmeter |
| 07/15/1986 | US4600886 Apparatus for orienting a magnetometer |
| 07/15/1986 | US4600883 Apparatus and method for determining the range and bearing in a plane of an object characterized by an electric or magnetic dipole |
| 07/15/1986 | US4600356 Underground pipeline and cable detector and process |
| 07/15/1986 | CA1207835A1 Baggage inspection apparatus and method for determining the presence of explosives |
| 07/09/1986 | CN85108416A Electro magnetic logging apparatus with slot antennas |
| 07/08/1986 | US4599566 High transmitting power deep penetration well logging sonde |
| 07/02/1986 | EP0186570A2 Electromagnetic logging apparatus with slot antennas |
| 07/02/1986 | CA1207025A Magnetometer method of borehole fracture detection |
| 07/02/1986 | CA1207024A Method and apparatus for determining the trace and depth of underground metallic conductors |