| 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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| 09/30/1993 | WO1993019387A1 Device for sensing aircraft |
| 09/22/1993 | EP0561559A1 Electrically-and-magnetically-coupled, batteryless, portable frequency divider |
| 09/22/1993 | EP0561492A2 Method for estimating formation permeability from wireline logs using neural networks |
| 09/22/1993 | EP0560893A1 System for logging a well during the drilling thereof. |
| 09/21/1993 | US5247281 Capacitive phase shift proximity detector |
| 09/21/1993 | US5247257 Electronic metal detector return signal phase changer |
| 09/21/1993 | CA1322392C Electromagnetic detection system |
| 09/17/1993 | CA2078402A1 Method for estimating formation permeability from wireline logs using neural networks |
| 09/15/1993 | EP0560651A2 Electromagnetic logging method and apparatus |
| 09/15/1993 | EP0331728B1 Apparatus for detecting materials buried under the ground |
| 09/15/1993 | CN1022134C Magnetic defect detector for steel strip |
| 09/14/1993 | US5245307 Search coil assembly for electrically conductive object detection |
| 09/14/1993 | US5245295 Method of detecting a variation in stray capacitance by use of a pll circuit |
| 09/07/1993 | US5243521 Width determination of fractures intersecting a borehole |
| 09/07/1993 | US5243340 Supervision and control of airport lighting and ground movements |
| 09/07/1993 | US5243290 Apparatus and method of logging using slot antenna having two nonparallel elements |
| 08/31/1993 | US5241301 Device and method for real-time monitoring of accidental damage to the protective covering of underground or immersed metal structures or pipelines |
| 08/31/1993 | US5241298 Electrically-and-magnetically-coupled, batteryless, portable, frequency divider |
| 08/31/1993 | US5241273 Method for controlling directional drilling in response to horns detected by electromagnetic energy propagation resistivity measurements |
| 08/31/1993 | US5240350 Apparatus for detecting position of underground excavator and magnetic field producing cable |
| 08/25/1993 | EP0557026A2 A search coil frame assembly for metal detectors and method for making same |
| 08/24/1993 | US5239696 Linear power amplifier utilizing current feedback |
| 08/24/1993 | US5239474 Dipole moment detection and localization |
| 08/24/1993 | US5239267 Method for improving the accuracy of dip determination using adjustable high pass filters |
| 08/24/1993 | US5239209 Zero crossing detection circuit |
| 08/20/1993 | CA2089835A1 Search coil frame assembly for metal detectors and method for making same |
| 08/18/1993 | EP0556114A1 Logging method and apparatus for investigating geometrical characteristics of a borehole |
| 08/18/1993 | EP0457809B1 Conductor tracing system |
| 08/17/1993 | US5237307 Non-contact tamper sensing by electronic means |
| 08/11/1993 | EP0554581A1 Method for producing a flat flexible antenna core for a chip transponder to be incorporated in a badge or similar object, and a thus produced antenna core |
| 08/11/1993 | EP0261227B1 Capacitive sensor and metal detector for detecting concealed objects |
| 08/10/1993 | US5235326 Multi-mode identification system |
| 08/10/1993 | US5235285 Well logging apparatus having toroidal induction antenna for measuring, while drilling, resistivity of earth formations |
| 08/03/1993 | US5233522 Multifrequency dielectric logging tool including antenna system responsive to invaded rock formations |
| 08/03/1993 | US5233304 Electromagnetic source integrated into an element of a well casing |
| 08/03/1993 | US5233300 Detection of explosive and narcotics by low power large sample volume nuclear quadrupole resonance (NQR) |
| 08/03/1993 | US5233294 Inductive proximity sensor and position transducer with a passive scale |
| 07/28/1993 | EP0552268A1 Magnetic field generating assembly. |
| 07/27/1993 | US5231359 Ceramic resonance type electrostatic sensor apparatus |
| 07/27/1993 | US5231355 Locator transmitter having an automatically tuned antenna |
| 07/27/1993 | US5230387 Downhole combination tool |
| 07/27/1993 | US5230386 Method for drilling directional wells |
| 07/22/1993 | WO1993014478A1 Methods and device for remote sensing of objects |
| 07/22/1993 | WO1993014474A1 Method and device for electronic identification |
| 07/22/1993 | WO1993014413A1 Determination of rock core characteristics |
| 07/22/1993 | WO1993014370A1 Method for measuring position and angle |
| 07/22/1993 | DE4301000A1 Capacitive detector system, e.g. for safety belt controller, - contains central electrode between earth and sensor electrodes with potential matching device |
| 07/22/1993 | CA2128433A1 Method for measuring position and angle |
| 07/22/1993 | CA2128432A1 Method and device for electronic identification |
| 07/22/1993 | CA2128431A1 Methods and device for remote sensing of objects |
| 07/21/1993 | EP0552088A1 Well logging method and apparatus using passive azimuthal electrodes |
| 07/21/1993 | EP0551606A2 Metal detector |
| 07/21/1993 | EP0329709B1 Methods and apparatus for measurement of electronic properties of geologigal formations through borehole casing |
| 07/20/1993 | US5229765 SP noise cancellation technique |
| 07/20/1993 | US5228351 Arrangement for measuring the field angle of a magnetic field as a function of axial position within a magnet bore tube |
| 07/14/1993 | CN1021602C Electric measuring method of depth under well |
| 07/13/1993 | US5227799 Road void search radar system |
| 07/13/1993 | US5227764 Electromagnetic proximity sensor |
| 07/13/1993 | US5227667 Microwave proximity switch |
| 07/08/1993 | WO1993013435A1 Electronic device for multiplexing a plurality of ac-driven loads |
| 07/07/1993 | CN1021521C Composite well logging of complete gradient |
| 07/06/1993 | CA1319953C2 Null balanced well logging in hydrocarbon contaminated groundwater |
| 07/01/1993 | DE4143212A1 Spinner yarn break monitor - has sender-receiver assembly to check gap between them and can be tested |
| 07/01/1993 | DE4142680A1 Evaluation circuit for inductive sensor - includes coil with inductance dependent on measurement parameter, oscillator and synchronous rectifier, and allows separate measurement of coil's resistance and inductance |
| 06/30/1993 | EP0549444A1 Device for multiplexing several AC excited loads |
| 06/30/1993 | CN1073780A Microcomputer controlled multiple-way electrode switching device |
| 06/29/1993 | US5223794 Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps |
| 06/23/1993 | CN2136988Y Transient field three-component searching unit (probe) |
| 06/16/1993 | EP0546509A2 Apparatus on harvesting machines for the recognition of ferromagnetic foreign bodies in the crop |
| 06/10/1993 | WO1993011451A1 Nuclear magnetic resonance detection of geologic structures |
| 06/09/1993 | EP0545422A1 Multiple pulse responder and detection system and method of making and using same |
| 06/09/1993 | EP0532604A4 Sub-audio magnetics instrument |
| 06/08/1993 | US5218301 Method and apparatus for determining distance for magnetic and electric field measurements |
| 06/08/1993 | US5218300 Method and equipment for noise-reduction when detecting a target by means of a system of several detector elements |
| 06/05/1993 | CA2083886A1 Multiple pulse responder and detection system and method of making and using same |
| 06/02/1993 | EP0544585A1 Nuclear magnetic resonance pulse sequences for determining bound fluid volume |
| 06/02/1993 | EP0544584A1 Well logging method and apparatus using azimuthal electrodes |
| 06/02/1993 | EP0544583A1 Well logging method and apparatus using annular and azimuthal electrodes |
| 06/02/1993 | EP0436675B1 Process and device for locating submarines |
| 05/27/1993 | WO1993010473A1 Method and apparatus for surveying terrain resistivity |
| 05/25/1993 | US5214384 Method including electrical self potential measurements for detecting multiphase flow in a cased hole |
| 05/25/1993 | US5214377 Magnetic debris monitor using magneto-optic sending |
| 05/25/1993 | US5214376 Device for establishing the position of a conductor of an enveloped cable having proximity sensor and a yieldably supported roller driven by the cable |
| 05/19/1993 | EP0541843A1 Wire presence and identification system |
| 05/18/1993 | US5212495 Composite shell for protecting an antenna of a formation evaluation tool |
| 05/18/1993 | US5212447 Apparatus and technique for nmr diffusion measurement |
| 05/18/1993 | US5211165 Tracking system to follow the position and orientation of a device with radiofrequency field gradients |
| 05/13/1993 | WO1993009425A1 Metal grain detecting sensor, metal grain detecting method and metal grain detecting apparatus |
| 05/13/1993 | DE4136587A1 Ammunition locating unit distinguishing between live munition and shrapnel etc. - uses sonic or ultrasonic exciter for direct application of sonic waves for exciting ground and evaluates reflected signal |
| 05/12/1993 | EP0541520A2 Detector for detecting discontinuities in a pipe |
| 05/12/1993 | EP0541425A2 Dipmeter apparatus and method for investigating earth formations |
| 05/12/1993 | EP0541392A1 Metal detection |
| 05/12/1993 | CN2133002Y Cable detector of underground pipeline |
| 05/11/1993 | US5210691 Method and apparatus for producing a more accurate resistivity log from data recorded by an induction sonde in a borehole |
| 05/11/1993 | US5210495 Electromagnetic logging method and apparatus with scanned magnetic dipole direction |
| 05/11/1993 | US5210489 Arrangement with field correcting structure producing a homogeneous magnetic field at a sensor zone for detecting movement of a ferromagnetic element |
| 05/05/1993 | EP0540425A2 Method and apparatus for investigating earth formations |
| 05/05/1993 | EP0403632A4 Electronic article surveillance system with improved differentiation |
| 05/04/1993 | US5208539 Method for determining electromagnetically the locations of underground ore deposits |
| 04/28/1993 | EP0539272A2 Method and apparatus for detecting and quantifying hydrocarbon bearing laminated reservoirs on a workstation |