| 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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| 01/15/1992 | EP0466454A2 Coil array for MWD well logging |
| 01/14/1992 | US5081419 High sensitivity well logging system having dual transmitter antennas and intermediate series resonant |
| 01/14/1992 | US5080390 Vehicle with plastic suspension |
| 01/11/1992 | CA2046700A1 Azimuthal toroid array for resistivity logging system |
| 01/09/1992 | WO1992000534A1 Metal detector |
| 01/08/1992 | EP0464892A2 Moving ferromagnetic element detection arrangement |
| 01/07/1992 | US5079502 Proximity sensor having a bridge circuit with a voltage controlled resistance |
| 01/07/1992 | CA1293991C Nuclear magnetism logging tool using high-temperature superconducting squid detectors |
| 12/31/1991 | CA1293769C Electrical well logging interpretation |
| 12/27/1991 | EP0386108A4 Downhole pulse radar |
| 12/26/1991 | WO1991020003A1 An improved system for locating concealed underground objects using digital filtering |
| 12/26/1991 | WO1991020002A1 An improved system for locating concealed underground objects |
| 12/26/1991 | WO1991020001A1 Operator interface for a system for locating concealed underground objects |
| 12/26/1991 | WO1991020000A1 Magnetic detection device for ferromagnetic moored mines |
| 12/24/1991 | US5075626 Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences |
| 12/24/1991 | US5075625 Procedure and device for the detection of inversions of the earth's magnetic field by means of measurement taken in a drill shaft |
| 12/23/1991 | WO1992000229A1 Product monitoring |
| 12/23/1991 | CA2086001A1 Product monitoring |
| 12/18/1991 | CN1057113A Fully automatic geomagnetic field component measuring method and apparatus |
| 12/12/1991 | WO1991019368A1 Method and system for passive detection of electromagnetic events associated with destructive devices |
| 12/12/1991 | DE4018312A1 Locating torpedo passing under or by moving target ship - involves detection and computer evaluation of alternating magnetic field emitted by torpedo using pulses on target ship |
| 12/10/1991 | US5072180 Temperature compensated method and apparatus for detecting the oscillation of a resonant circuit to determine distance or proximity |
| 12/10/1991 | US5072172 Method and apparatus for measuring the thickness of a layer of geologic material using a microstrip antenna |
| 12/07/1991 | WO1991019210A1 Sub-audio magnetics instrument |
| 12/05/1991 | DE4017780A1 Electronic metal component sensor device - uses component sensors providing sequential response signals upon component proximity |
| 12/04/1991 | EP0459478A2 Apparatus determining the relative movement of metal with respect to a metal sensitive detector arrangement |
| 12/04/1991 | EP0459064A1 Borehole measurement of NMR characteristics of earth formations and interpretations thereof |
| 12/04/1991 | CN1056751A Man body approaching sensing method and circuit |
| 12/03/1991 | US5070462 Device for locating a boring machine |
| 12/03/1991 | US5070328 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 |
| 11/27/1991 | EP0457809A1 Conductor tracing system. |
| 11/27/1991 | EP0457788A1 Process and device for monitoring the occurrence or spreading of fractures or cracks in materials, workpieces, component parts, structures or flying objects, in particular in earthquake-prone regions or movement of strata during tunnelling. |
| 11/26/1991 | US5068612 Electromagnetic shield for an inductive search coil assembly |
| 11/26/1991 | CA2041982A1 Magnetic detection apparatus and method of manufacturing same |
| 11/26/1991 | CA1292539C Magnetic locating and tracing system and method using dual-antenna transmitter |
| 11/21/1991 | EP0457316A1 Device for the measurement of the position of a conductor of a cable within the cable covering |
| 11/21/1991 | DE4015902A1 Magnetic field measurement arrangement - has output via loudspeaker and matched to human aural response clips signal and amplifies edges as input amplitude increases |
| 11/19/1991 | US5066917 Long feature vertical or horizontal electrical conductor detection methodology using phase coherent electromagnetic instrumentation |
| 11/19/1991 | US5066916 Technique for separating electromagnetic refracted signals from reflected signals in down hole electromagnetic tools |
| 11/19/1991 | US5066913 Ferrous metal detector for detecting a broken mandrel in a cold pilgering operation |
| 11/13/1991 | EP0456615A1 A method of detecting the position of a mechanical part made of ferromagnetic material |
| 11/13/1991 | EP0171433B1 Identification system and transponder therefor |
| 11/12/1991 | US5065100 Measurement of in-phase and out-of-phase components of low frequency A.C. magnetic fields within cased boreholes to measure geophysical properties of geological formations |
| 11/12/1991 | US5065099 Coil array for a high resolution induction logging tool and method of logging an earth formation |
| 11/12/1991 | US5065098 System for locating concealed underground objects using digital filtering |
| 11/12/1991 | US5065093 Inductive proximity sensor for detecting an object starting electrical conductivity |
| 11/12/1991 | US5064006 Downhole combination tool |
| 11/07/1991 | DE4114784A1 Guiding tool along subterranean path e.g. under river |
| 11/06/1991 | EP0455613A2 Inductive proximity sensor and position transducer with a passive scale |
| 11/05/1991 | US5063306 Proximity sensing device |
| 11/05/1991 | CA2041622A1 Guiding of a tool along a subterranean path |
| 10/31/1991 | DE4012969A1 Locator for non-exposed electrical leads - uses electrical audio frequency generator and signal appts. with exchangeable search probe responding to EM waves |
| 10/29/1991 | US5061941 Composite antenna for electronic article surveillance systems |
| 10/29/1991 | US5061364 Diagnostic filter for detecting conductive and semiconductive particles in a fluid stream |
| 10/23/1991 | EP0453347A1 Method for detection of a ferromagnetic land vehicle |
| 10/22/1991 | US5059907 Method for evaluating the water saturation of subterranean formations from dielectric permittivity measurements |
| 10/16/1991 | EP0451812A2 Electromagnetic sensor element and method for making same |
| 10/15/1991 | US5058077 Compensation technique for eccentered MWD sensors |
| 10/09/1991 | EP0359767B1 Locating process for localizing unknown receiver or transmitter positions |
| 10/09/1991 | CN1055243A Detector of metalliferous objects |
| 10/08/1991 | US5055793 Portable transmitter apparatus for inducing alternating current in a buried metallic line |
| 10/08/1991 | US5055788 Borehole measurement of NMR characteristics of earth formations |
| 10/08/1991 | US5055787 Borehole measurement of NMR characteristics of earth formations |
| 10/03/1991 | WO1991014954A1 Bedrock exploration system using transient electromagnetic measurements |
| 10/02/1991 | CN1055068A Metalliferous objects detector |
| 10/01/1991 | US5053781 High resolution passive microwave sensors for earth remote sensing |
| 09/24/1991 | US5051962 Computerized truck instrumentation system |
| 09/24/1991 | US5051726 Electronic article surveillance system with antenna array for enhanced field falloff |
| 09/24/1991 | US5051671 Proximity sensor and control |
| 09/24/1991 | CA2038850A1 Dipmeter responsive to phase shift differential |
| 09/24/1991 | CA1289648C System for detecting underground objects |
| 09/24/1991 | CA1289620C Method and apparatus for optimizing the reception pattern of the antenna of a propagating electromagnetic wave logging tool |
| 09/19/1991 | WO1991014079A1 System for detecting position of underground excavator and magnetic field producing cable |
| 09/17/1991 | US5049857 Multi-mode electronic article surveillance system |
| 09/17/1991 | US5049822 Method of and apparatus for carrying out measurements on open and closed fractures in a hard rock formation pierced by a borehole |
| 09/10/1991 | US5047718 Improving the discrimination of an impulse technique metal detector by correlating responses inside and outside of a cut-off peak area |
| 09/10/1991 | US5046583 Oil level sensor for an internal combustion engine |
| 09/04/1991 | EP0242391B1 A magnetic self-ranging system for use in the degaussing of ships |
| 09/03/1991 | US5045920 Dual-Hall ferrous-article-proximity sensor |
| 09/03/1991 | US5045795 Azimuthally oriented coil array for MWD resistivity logging |
| 09/03/1991 | US5045789 Detector for detecting foreign matter in object by using discriminant electromagnetic parameters |
| 09/03/1991 | US5045368 Self-dispensing spaced electronic markers |
| 08/29/1991 | DE4005791A1 Detector of metalliferous objects |
| 08/28/1991 | EP0443885A1 Fixing device for an inductive detector on a machine |
| 08/27/1991 | US5043669 Methods and apparatus for measurement of the resistivity of geological formations from within cased wells in presence of acoustic and magnetic energy sources |
| 08/27/1991 | US5043668 Methods and apparatus for measurement of electronic properties of geological formations through borehole casing |
| 08/27/1991 | US5043667 Method of magnetotelluric exploration using areal arrays |
| 08/27/1991 | US5043666 Self-calibrating electromagnetic field sensor for locating buried conduits |
| 08/21/1991 | EP0441857A1 Detection of non-metallic materials |
| 08/20/1991 | US5041975 Borehole correction system for an array induction well-logging apparatus |
| 08/20/1991 | US5041856 In-line metallic debris particle detection probe and resonant evaluation system utilizing the same |
| 08/20/1991 | US5041826 Interrogator |
| 08/20/1991 | US5041792 Stable in ground water brine |
| 08/20/1991 | US5040421 Measuring method of fluctuations of ground and its apparatus |
| 08/14/1991 | EP0441587A2 Multi-channel electrostatic sensor apparatus |
| 08/14/1991 | EP0441381A1 Capacitive occupation detector apparatus |
| 08/13/1991 | US5039946 Metalliferous objects detector having a pair of angularly positioned driving loops and a pair of parallel, coaxial receiving loops |
| 08/13/1991 | CA1287675C2 Sensor and metal detector with a display for quantitatively displaying signals resulting from concealed objects |
| 08/10/1991 | WO1991012119A1 Methods, apparatus and devices relating to magnetic markers for elongated hidden objects |
| 08/09/1991 | CA2035415A1 Capacitive occupation detector apparatus |