| 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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| 09/06/1988 | US4769631 Method, system and apparatus for magnetic surveillance of articles |
| 09/06/1988 | US4769606 Induced polarization method and apparatus for distinguishing dispersed and laminated clay in earth formations |
| 09/06/1988 | US4769602 Determining multiphase saturations by NMR imaging of multiple nuclides |
| 09/06/1988 | US4769601 Method of and apparatus for determining cement strength and extent of setting with a pulsed nuclear magnetic resonance spectrometer |
| 08/30/1988 | US4768026 Yarn break detector for spinning and weaving machines |
| 08/30/1988 | US4767973 Systems and methods for sensing position and movement |
| 08/25/1988 | WO1988006298A1 Method and apparatus for locating opposite points on the two sides of a planar element such as a structural barrier |
| 08/24/1988 | EP0279731A1 Method for tesing metallic objects in a non-metallic material, in particular the armouring iron in reinforced concrete |
| 08/24/1988 | EP0279190A2 Inductive detection apparatus |
| 08/24/1988 | EP0090021B1 A marker for subterrenean marking and a novel application for such a marker |
| 08/23/1988 | US4766442 Antenna structure for use with a transmitter located at a great depth |
| 08/23/1988 | US4766385 Underwater buried mine classifier |
| 08/23/1988 | US4766384 For investigating formations surrounding a borehole |
| 08/18/1988 | DE3731329A1 Metal detector |
| 08/18/1988 | DE3703311A1 Process for identification of pipes, iron or cables laid under plaster during performance of drilling work in walls, ceilings or floors and device for carrying out the process |
| 08/16/1988 | US4763500 Roller track monitoring in rolling mills |
| 08/16/1988 | CA1240756A1 Method and apparatus for producing electromagnetic surveillance fields |
| 08/11/1988 | DE3702428A1 Method and device for detecting, in terms of metrology, a projectile or parts thereof |
| 08/10/1988 | EP0277149A1 Magnetic trap |
| 08/09/1988 | CA1240366A1 Dielectric methods and apparatus for in situ prediction of porosity and specific surface area (i.e. soil type) and for detection of hydrocarbons, hazardous waste materials, andthe degree of melting of ice and to predict in situ stress strain behavior |
| 08/02/1988 | US4761649 Cable detector |
| 08/02/1988 | CA1239989A1 Apparatus for detecting power lines |
| 07/27/1988 | EP0275756A1 Proximity detector between a metallic mass and an element under electric tension |
| 07/26/1988 | US4760340 Measuring and evaluating surface potentials for determining the boundaries of underground reservoirs |
| 07/26/1988 | CA1239685A1 Microwave detection system |
| 07/26/1988 | CA1239679A1 Methods and apparatus employing spontaneous resonance |
| 07/19/1988 | US4758788 Metal detector for intake of field chopper |
| 07/14/1988 | WO1988005172A1 Geoelectrical process based on structural geology calibration for determining hydraulic characteristic values |
| 07/13/1988 | EP0274450A2 A device for measuring the proximity of a metal object |
| 07/12/1988 | US4757262 Method for geophysical exploration using electromagnetic array |
| 07/06/1988 | EP0273481A2 Non-oriented gear tooth sensor using a Hall cell |
| 07/05/1988 | US4755944 Method for obtaining dielectric constant and conductivity information on subsoil structure using continuous complex geotomography |
| 06/30/1988 | WO1988004644A1 Device for detecting end breakage |
| 06/23/1988 | DE3737774A1 Metal detector |
| 06/21/1988 | US4752882 Method for determining the effective water saturation in a low-resistivity hydrocarbon-bearing rock formation based upon rock matrix conductance |
| 06/21/1988 | US4752881 Electrical resistivity geological surveying apparatus and method utilizing plural cable sections with controlled distributed electrode/cable conductor switching |
| 06/21/1988 | US4752778 Microwave barrier |
| 06/15/1988 | EP0271245A2 Method and apparatus for detecting counterfeit articles |
| 06/14/1988 | US4751516 Antenna system for magnetic and resonant circuit detection |
| 06/14/1988 | US4751476 Detector device and method for distinguishing between fluids having different dielectric properties |
| 06/09/1988 | DE3731330A1 Metal detector |
| 06/08/1988 | EP0270434A1 Device for measuring magnetic fields |
| 06/07/1988 | CA1237769A1 System and method for real time data collection surveying and processing |
| 06/07/1988 | CA1237764A2 Method for the magnetization of well casing |
| 06/02/1988 | WO1988004064A1 Synthetically focused resistivity method and apparatus for detecting subsurface cavities |
| 06/02/1988 | WO1988004063A1 Apparatus for detecting materials buried under the ground |
| 06/02/1988 | WO1988004056A1 Method and apparatus for locating leaks in a multiple layer geomembrane |
| 06/01/1988 | EP0268580A1 Magnetic field-dependent, inductive proximity switch. |
| 05/31/1988 | US4748415 For measurement of geological formation properties |
| 05/25/1988 | EP0268420A2 Marker for detecting buried object |
| 05/19/1988 | WO1988003657A1 Methods and apparatus for measurement of electronic properties of geologigal formations through borehole casing |
| 05/19/1988 | WO1988003654A1 Device for measurement of a magnetic field which is constant or varies over time |
| 05/17/1988 | US4745363 Non-oriented direct coupled gear tooth sensor using a Hall cell |
| 05/11/1988 | EP0267021A2 Means of detecting metal in a stream of particulate matter |
| 05/11/1988 | DE3735694A1 Electronic switching device operating contactlessly |
| 05/10/1988 | US4744030 Method and apparatus for measuring internal casing wear |
| 05/10/1988 | US4743854 In-situ induced polarization method for determining formation permeability |
| 05/05/1988 | WO1988003276A1 Method of detecting object and apparatus therefor |
| 05/05/1988 | WO1988003273A1 Detection/identification apparatus |
| 05/05/1988 | DE3722782A1 Coaxial cable |
| 05/04/1988 | EP0265844A2 Electronic switching device operating without contact |
| 05/03/1988 | US4742402 Seismoelectric signal recording device |
| 05/03/1988 | US4742340 Method and apparatus for detecting counterfeit articles |
| 05/03/1988 | US4742305 Method for constructing vertical images of anomalies in geological formations |
| 04/27/1988 | EP0264408A1 Inductive proximity sensor |
| 04/26/1988 | US4740757 Method and apparatus for locating leaks in a multiple layer geomembrane liner |
| 04/26/1988 | CA1235771A1 Apparatus for determining the presence of a metallic melt in a passage channel of a metallurgical furnace or of a casting ladle |
| 04/26/1988 | CA1235743A1 Focused very high frequency induction logging |
| 04/19/1988 | US4739325 Apparatus and method for down-hole EM telemetry while drilling |
| 04/19/1988 | US4739272 Apparatus for microinductive investigation of earth formations with improved electroquasistatic shielding |
| 04/19/1988 | US4739262 Determining the earth's horizontal magnetic gradient along exploration line |
| 04/19/1988 | US4739255 Method for analyzing thinly bedded sand/shale formations |
| 04/19/1988 | US4738812 Method of forming an electrode structure |
| 04/13/1988 | CN87100047A Tri-lateral logger with deep and shallow measuring capability |
| 04/12/1988 | US4737719 Coherent detection system for use in induction well logging apparatus |
| 04/12/1988 | CA1235179A1 Drill stem logging system with electomagnetic waves using electrostatically shielded transmitter and receiver elements |
| 04/05/1988 | US4736300 Automatic gain control of formation measurements by varying induced current flow |
| 04/05/1988 | CA1234892A1 Security tag detection system |
| 04/05/1988 | CA1234870A1 Method for preventing the drilling of a new well into one of a plurality of production wells |
| 03/30/1988 | EP0261227A1 Capacitive sensor and metal detector for detecting concealed objects. |
| 03/30/1988 | EP0261142A1 Metal detection in conducting media using a two frequency signal |
| 03/30/1988 | CN87210850U Proton magnetometer system for portabel computer |
| 03/30/1988 | CN87104495A Device |
| 03/23/1988 | EP0260340A1 Control device comprising a magnetic-field detector |
| 03/23/1988 | CN86105449A Method and instrument of adjacent spherical focussed log |
| 03/15/1988 | US4731591 Inductive proximity switch having switched capacitor for controlling hysteresis |
| 03/09/1988 | EP0258935A1 A method of checking the loading and unloading of tankers by means of an electromagnetic identification system, and an identification system for use in said method |
| 03/09/1988 | EP0258931A2 Method for determining the position of underwater-lying objects relative to an underwater-movable apparatus |
| 03/08/1988 | US4730188 Identification system |
| 03/08/1988 | US4730162 Time-domain induced polarization logging method and apparatus with gated amplification level |
| 03/08/1988 | US4730161 Dual frequency well logging system for determining the water resistivity and water saturation of an earth formation |
| 03/02/1988 | EP0257624A2 Marking tape with wire conductors and method for use |
| 03/01/1988 | US4728897 Microwave reflection survey technique for determining depth and orientation of buried objects |
| 03/01/1988 | US4728892 NMR imaging of materials |
| 03/01/1988 | CA1233510A1 Method and apparatus for dielectric well logging of subsurface earth formations |
| 02/24/1988 | EP0256004A1 Proximity sensing device |
| 02/23/1988 | US4727329 Method and system for measuring displacement of buried fluid transmission pipelines |
| 02/16/1988 | US4725778 Field testing insulation between two conducting bodies subject to leakage |
| 02/11/1988 | WO1988001063A1 Conductivity determination in a formation having a cased well |
| 02/09/1988 | US4724390 Non-superconducting apparatus for detecting magnetic and electromagnetic fields |