| 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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| 02/09/1988 | US4724385 Acoustic paramagnetic logging tool |
| 02/03/1988 | EP0122932B1 Well logging sleeve and method for making same |
| 01/27/1988 | EP0254325A2 Process for three-dimensional mathematical modeling of underground geologic volumes |
| 01/19/1988 | US4720681 Digital induction logging tool |
| 01/14/1988 | WO1988000083A1 Magnetic trap |
| 01/14/1988 | DE3623588A1 Device for locating embedded electrical wires |
| 01/14/1988 | DE3623045A1 Process and cable finding device for locating an electric wire, especially one laid in masonry |
| 01/13/1988 | EP0252773A1 Method and device for monitoring the movement of objects, particularly of motor vehicles |
| 01/12/1988 | US4719426 Method for magnetically detecting a localized disturbance of the ground |
| 01/12/1988 | US4719423 NMR imaging of materials for transport properties |
| 01/12/1988 | US4719421 Metal detector for detecting product impurities |
| 01/12/1988 | CA1231377A1 Apparatus for focusing electrode induced polarization logging |
| 01/12/1988 | CA1231376A1 Well logging coil receiving means and method |
| 01/07/1988 | EP0250986A2 Method for constructing vertical images of anomalies in geological formations |
| 01/07/1988 | DE3729628A1 Borehole hysteresis meter for in-situ investigations of rock magnetism in prospecting and geological exploratory drillings |
| 01/05/1988 | US4717878 Nuclear magnetic resonance sensing apparatus and techniques |
| 01/05/1988 | US4717877 Nuclear magnetic resonance sensing apparatus and techniques |
| 01/05/1988 | US4717876 NMR magnet system for well logging |
| 01/05/1988 | US4717006 Coin discriminating apparatus using coil pulses of different lengths |
| 01/05/1988 | US4716973 Method for evaluation of formation invasion and formation permeability |
| 01/05/1988 | CA1231152A1 Method and system for detecting an indicating device |
| 01/05/1988 | CA1231135A1 Induction logging sonde with metallic support |
| 12/23/1987 | EP0250379A2 A device for sensing the number of items stored in a compartment |
| 12/22/1987 | US4714889 Method of interpreting impedance distribution of an earth formation using precursor logging data provided by a multi-electrode logging array stationary within a borehole |
| 12/22/1987 | US4714888 Apparatus for observing the passage of a pig in a pipeline |
| 12/22/1987 | US4714881 Nuclear magnetic resonance borehole logging tool |
| 12/16/1987 | EP0249110A2 Sensor for a metal detector |
| 12/15/1987 | USRE32564 Apparatus for determining the resistivity of a subsurface earth formation at different lateral distances from a bore hole wall |
| 12/15/1987 | USRE32563 Continuous wave medium frequency signal transmission survey procedure for imaging structure in coal seams |
| 12/10/1987 | DE3619138A1 Apparatus and method for tracing local anomalies in the terrestrial magnetic field |
| 12/10/1987 | DE3616604A1 Residual heat (afterheat) sensor which can be embedded in plaster |
| 12/09/1987 | CN87104302A Vertical image method for mapping anomalous phenomena in the stratum |
| 12/08/1987 | US4712070 Apparatus for microinductive investigation of earth formations |
| 12/08/1987 | US4712064 Magnetoresistive sensor for detecting position or speed of a ferromagnetic body |
| 12/05/1987 | CN86209010U Magnetic detector for detecting underground magnetic substances |
| 12/03/1987 | WO1987007390A1 Device for measuring the parameters of an underground mineral deposit |
| 12/02/1987 | EP0247672A2 Method for determining the distance between adjacent wells |
| 12/02/1987 | EP0247669A2 Method for analyzing thinly bedded sand/shale formations |
| 12/02/1987 | EP0247095A1 Metal detector sensing head with reduced eddy current coils |
| 12/01/1987 | US4710713 Nuclear magnetic resonance sensing apparatus and techniques |
| 12/01/1987 | US4710708 Method and apparatus employing received independent magnetic field components of a transmitted alternating magnetic field for determining location |
| 12/01/1987 | CA1229877A1 Electromagnetic instruments and survey procedures for imaging structure in coal seams |
| 11/25/1987 | EP0246886A1 Method of and apparatus for locating a discrete inground boring device |
| 11/24/1987 | US4709213 Metal detector having digital signal processing |
| 11/24/1987 | US4707887 Apparatus for detecting foreign bodies, such as pieces of metal or the like, in textile fiber bales |
| 11/24/1987 | CA1229673A1 Object detector |
| 11/24/1987 | CA1229660A1 Magnetic exploration apparatus for boreholes |
| 11/19/1987 | EP0245555A1 Method of and system and apparatus for locating and/or tracking stolen or missing vehicles and the like |
| 11/12/1987 | DE3615652A1 Inductive detector (locator) |
| 11/10/1987 | US4706031 Method and system for detecting an object with a radio wave |
| 11/10/1987 | US4706030 Waveform generator for nuclear magnetic resonance apparatus |
| 11/04/1987 | CN86103551A Electromagnetic array profiling survey method |
| 11/03/1987 | US4704602 Method and system for detecting an indicating device |
| 11/03/1987 | US4704581 Electromagnetic logging apparatus using vertical magnetic dipole slot antennas |
| 11/03/1987 | US4704579 Method of distinguishing material characteristics in a well bore for controlling photograph taking in the well bore |
| 10/28/1987 | EP0243258A2 Method and apparatus for investigating a borehole using an array of elements |
| 10/28/1987 | EP0242424A2 Electromagnetic array profiling survey method |
| 10/27/1987 | US4703279 Method of interpreting impedance distribution of an earth formation penetrated by a borehole using precursor data provided by a moving logging array having a single continuously emitting current electrode and a multiplicity of potential electrodes |
| 10/27/1987 | US4703278 Well logging disc coil receiving means and method |
| 10/27/1987 | US4703277 Method and apparatus for obtaining properties of subsurface formations from textural models derived from formation parameters |
| 10/27/1987 | CA1228646A1 Prospecting method and apparatus |
| 10/27/1987 | CA1228639A1 Method for the magnetization of well casing |
| 10/22/1987 | WO1987006354A1 Inductive proximity sensor |
| 10/20/1987 | US4701712 Thermoregulated magnetic susceptibility sensor assembly |
| 10/20/1987 | US4701711 Nuclear magnetic resonance apparatus with switched attenuator |
| 10/20/1987 | CA1228397A1 Secondary field dielectric constant well logging system and method |
| 10/15/1987 | DE3611862A1 Induktiver naeherungssensor Inductive naeherungssensor |
| 10/13/1987 | US4700142 Method for determining the location of a deep-well casing by magnetic field sensing |
| 10/13/1987 | US4700141 Deep penetration well logging sonde |
| 10/13/1987 | US4700140 Determination of water or residual oil saturation in earth formations independent of lithology |
| 10/13/1987 | US4700139 Metal detector circuit having selectable exclusion range for unwanted objects |
| 10/08/1987 | WO1987006010A1 Capacitive sensor and metal detector for detecting concealed objects |
| 10/06/1987 | US4698634 Subsurface inspection radar |
| 09/29/1987 | US4697190 Borehole located directional antennae means for electromagnetic sensing systems |
| 09/29/1987 | US4697150 Two electrode well logging system for measuring resistivity of subsurface formations |
| 09/29/1987 | CA1227538A2 Electrode structure to measure borehole resistivity |
| 09/29/1987 | CA1227537A1 Microwave electromagnetic borehole dipmeter |
| 09/16/1987 | EP0237323A2 nuclear magnetic resonance sensing apparatus and techniques |
| 09/16/1987 | EP0237171A2 Inductance divider sensor |
| 09/09/1987 | EP0235478A2 Borehole casing diagnostic apparatus |
| 09/09/1987 | EP0235207A1 Metal detector using amplitude cross-correlation |
| 09/08/1987 | US4692905 Method for geophysical prospecting of complex orebodies |
| 09/08/1987 | US4692707 Method and apparatus for measuring the earth formation resistivity of a plurality of radial regions around a borehole |
| 09/08/1987 | US4692706 Well logging means and method for determining water saturation of a petroleum reservoir having two transmitters and two receivers |
| 09/02/1987 | EP0234458A2 Proximity sensor |
| 09/01/1987 | US4691204 Radar apparatus |
| 09/01/1987 | US4691166 Electromagnetic instruments for imaging structure in geologic formations |
| 09/01/1987 | US4691165 Method and apparatus including spaced antennas for determining the trace and depth of underground metallic conductors |
| 09/01/1987 | CA1226342A1 Dielectric well logging system with electrostatically shielded coils |
| 09/01/1987 | CA1226329A1 Microwave electromagnetic borehole dipmeter |
| 08/25/1987 | US4689572 For investigating formations surrounding a borehole |
| 08/25/1987 | US4689569 For detecting anomalies in geologic formations |
| 08/25/1987 | US4688580 Non-invasive electromagnetic technique for monitoring bone healing and bone fracture localization |
| 08/19/1987 | CN86201631U Microcomputer-based autofrequency-selecting physical prospecting admeasuring apparatus |
| 08/18/1987 | US4687995 Secondary field dielectric constant and/or resistivity well logging system and method |
| 08/13/1987 | WO1987004851A1 Proximity sensing device |
| 08/13/1987 | WO1987004801A1 Metal detection in conducting media using a two frequency signal |
| 08/12/1987 | EP0231292A1 Detector device |
| 08/11/1987 | US4686477 Multiple frequency electric excitation method and identifying complex lithologies of subsurface formations |
| 08/11/1987 | US4686476 Plotting of magnetotelluric impedance to determine structure and resistivity variation of anomalies |