| 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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| 08/29/1989 | US4862316 Static charge dissipating housing for metal detector search loop assembly |
| 08/29/1989 | US4862090 Measuring pad arrangement for a logging sonde |
| 08/29/1989 | US4862089 Method of magnetotelluric exploration using a zigzag array |
| 08/29/1989 | US4862064 End sensor |
| 08/29/1989 | US4860756 Electromagnetic bone healing sensor using a multi-coil sensor array |
| 08/24/1989 | WO1989007775A1 Metal detector |
| 08/24/1989 | WO1989007769A1 Systems and markers using magnetic or spin resonance phenomena |
| 08/23/1989 | EP0329402A1 Systems and markers using magnetic or spin resonance phenomena |
| 08/22/1989 | US4859941 Proximity selectro with integral magnet, pole-piece plate and pair of magnetic transducers |
| 08/22/1989 | US4859931 Electronic detector with capacitor sensor and magnetic field sensor for locating an object behind a wall surface |
| 08/15/1989 | US4857891 Random-filament, multi-directionally responsive marker for use in electronic article surveillance systems |
| 08/15/1989 | US4857852 Induction well logging apparatus with transformer coupled phase sensitive detector |
| 08/15/1989 | US4857851 Fixing a geographical reference of a vehicle traveling through a pipeline |
| 08/15/1989 | US4857831 Borehole casing diagnostic apparatus and method |
| 08/15/1989 | CA1258488A1 Method for evaluating water saturation in petroleum reservoirs from dielectric permittivity |
| 08/09/1989 | EP0327422A1 Interpretation of electrical well loggings |
| 08/09/1989 | EP0326992A1 A device for measuring the impedance of a medium along a measurement line |
| 08/09/1989 | EP0326638A1 Non-superconducting apparatus for detecting magnetic and electromagnetic fields |
| 08/09/1989 | CN2042601U Dc digital electricity measuring instrument for electric prospecting |
| 08/08/1989 | US4855912 Method and apparatus for measurement of the thermal behavior of porous media |
| 08/08/1989 | US4854113 Digital noise cancellation in a metal detector |
| 08/01/1989 | US4853855 Dipmeter processing technique |
| 08/01/1989 | US4853617 Apparatus having capacitive sensor and metal detector for detecting objects concealed behind surfaces |
| 07/27/1989 | WO1989006590A1 Surface treating apparatus |
| 07/26/1989 | CN1034276A Frequency spectrum stimulated electricity surveying system with double-frequency channels and multiparameters |
| 07/25/1989 | US4851781 Method and apparatus for investigating a borehole using an array of elements |
| 07/25/1989 | US4851772 Magnet assembly for measurement of displacement |
| 07/19/1989 | EP0324309A2 Magnetic metal detector system |
| 07/19/1989 | CN1034069A Tracking helium (he4) optical pump magnetic instrument |
| 07/18/1989 | US4849699 Extended range, pulsed induction logging tool and method of use |
| 07/18/1989 | US4849696 Apparatus for determinig the strength and direction of a magnetic field, particularly the geomagnetic field |
| 07/12/1989 | EP0323713A2 Walk-through metal detector |
| 07/12/1989 | EP0181935B1 Microwave radiometer using fanbeam inversion |
| 07/11/1989 | US4847570 Electronic, contactless switchgear |
| 07/11/1989 | US4847557 Hermetically sealed magnetic sensor |
| 07/11/1989 | US4847552 Detection of electrically conductive materials beneath surface coatings employing eddy currents |
| 07/11/1989 | CA1257361A2 Method and apparatus for producing electromagnetic surveillance fields |
| 07/05/1989 | EP0323106A2 Noise cancellation in a metal detector |
| 07/05/1989 | CN1033673A Well logging apparatus and method |
| 07/04/1989 | US4845476 Proximity detector between a metallic mass and an element to which is applied an electric voltage |
| 07/04/1989 | US4845434 Magnetometer circuitry for use in bore hole detection of AC magnetic fields |
| 07/04/1989 | US4845433 Apparatus for microinductive investigation of earth formations |
| 07/04/1989 | US4845429 Inductance divider sensor |
| 06/27/1989 | US4843327 Branched sensor system |
| 06/27/1989 | US4843324 Apparatus for determining the location and distance to a concealed conductive structure |
| 06/27/1989 | US4843259 Process for the non-contacting detection of eddy current-induced bodies, particularly metal objects, as well as to sensors based on the process |
| 06/22/1989 | DE3742272A1 Rapid action coupling for a portable measuring device |
| 06/21/1989 | EP0320623A1 Device for determining the position of a catheter or a probe inside a living organ |
| 06/20/1989 | US4841250 Passive geophysical survey apparatus based upon the detection of the DC component of the vertical electrical potential of natural earth currents |
| 06/15/1989 | DE3740700A1 Measuring method for locating drilling obstacles and foreign bodies in the ground |
| 06/14/1989 | EP0320442A2 Use of a dielectric microwave resonator, and sensor circuits |
| 06/14/1989 | EP0320112A2 Magnetic sensing proximity detector |
| 06/14/1989 | EP0315642A4 Conductivity determination in a formation having a cased well. |
| 06/13/1989 | US4839654 System for detecting underground objects |
| 06/13/1989 | US4839602 Means for detecting metal in a stream of particulate matter |
| 06/06/1989 | US4837539 Magnetic sensing proximity detector |
| 06/06/1989 | US4837518 Method and apparatus for measuring the electrical resistivity of geologic formations through metal drill pipe or casing |
| 06/06/1989 | US4837517 Spatial frequency method and apparatus for investigating earth conductivity with high vertical resolution by induction techniques |
| 06/06/1989 | US4837514 Method of reducing noise in electromagnetic geophysical exploration data |
| 06/06/1989 | US4837511 Method and apparatus for identifying the metal included in a metallic item |
| 06/06/1989 | US4837509 Method and apparatus for measuring diameter of a steel reinforcement rod embedded in concrete and the thickness of the concrete overlayer |
| 06/06/1989 | US4837489 Magnetometer-based locator and identifier for ferrous objects having unknown shapes |
| 05/30/1989 | US4835474 Method and apparatus for detecting subsurface anomalies |
| 05/30/1989 | US4835473 Method using a d.c. source for determining resistivity distribution of the earth as a function of depth |
| 05/30/1989 | US4833773 Method for making search coil assembly for metal detectors |
| 05/17/1989 | EP0315642A1 Conductivity determination in a formation having a cased well. |
| 05/16/1989 | US4831383 System for detecting underground objects |
| 05/16/1989 | US4831331 Method and apparatus for interface location determination |
| 05/16/1989 | CA1254265A1 Lift-off compensation of eddy current probes |
| 05/03/1989 | EP0314573A2 Well logging apparatus and method |
| 05/02/1989 | CA1253567A1 Time-domain induced polarization logging method and apparatus |
| 04/25/1989 | USRE32913 Shields for antennas of borehole logging devices |
| 04/25/1989 | US4825165 Method and apparatus for detecting a transient phenomenon by monitoring variations of an alternating component of a vertical current emanating from the earth's surface |
| 04/20/1989 | DE3733529A1 Inductive unit for detecting metal parts |
| 04/19/1989 | EP0312168A1 A method and an apparatus for electronically identifying articles moving along a surface |
| 04/13/1989 | DE3731972A1 Locating device for non-metallic pipelines |
| 04/12/1989 | EP0310633A1 Well logging system employing focused current in measuring resistivity while drilling |
| 04/12/1989 | CN1032379A Well logging apparatus using natural current and circular natural potential |
| 04/11/1989 | US4821164 Process for three-dimensional mathematical modeling of underground geologic volumes |
| 04/11/1989 | US4821023 Walk-through metal detector |
| 04/11/1989 | US4820989 Methods and apparatus for measurement of the resistivity of geological formations from within cased boreholes |
| 04/11/1989 | US4819321 Method for making the search coil assembly for metal detectors |
| 04/06/1989 | WO1989003053A1 Downhole pulse radar |
| 04/06/1989 | WO1989003052A1 Capacitive material presence detecting apparatus |
| 04/06/1989 | DE3832289A1 Artikel mit integriertem marker Articles with integrated marker |
| 04/04/1989 | US4818998 Method of and system and apparatus for locating and/or tracking stolen or missing vehicles and the like |
| 04/04/1989 | US4818946 Method and apparatus for enhancing the resolution of an induction logging tool in measuring a characteristic of a borehole formation |
| 04/04/1989 | US4818944 Magnetic locating and tracing system and method using dual-antenna transmitter to distinguish between concealed adjacent objects |
| 03/29/1989 | EP0309085A2 A detector device |
| 03/29/1989 | EP0308718A2 Apparatus for marking particular spots of a submarine construction |
| 03/28/1989 | US4816758 Method and apparatus for the detection of slag co-flowing within a stream of molten metal |
| 03/28/1989 | US4816747 Method and apparatus for electrical surveys of subsurface structures utilizing cell-to-cell techniques with correction to direct potential measurements |
| 03/22/1989 | EP0308073A2 System for detecting stray metal in articles |
| 03/21/1989 | US4814768 For detecting/locating fractures in a geological formation |
| 03/21/1989 | US4814734 Search coil assembly for metal detectors |
| 03/21/1989 | US4814711 Survey system and method for real time collection and processing of geophysicals data using signals from a global positioning satellite network |
| 03/21/1989 | CA1251513A1 Multi frequency method for identifying complex lithologies of subsurface formations |
| 03/15/1989 | CN1003613B Object-detecting method and system |
| 03/14/1989 | US4812812 Apparatus and method for determining the position and orientation of a remote object |
| 03/14/1989 | US4812766 Telluric noise cancellation in induced polarization prospecting |