| 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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| 08/11/1987 | US4686475 Passive geophysical prospection system based upon the detection of the vertical electric field component of telluric currents and method therefor |
| 08/11/1987 | US4686474 Survey system for collection and real time processing of geophysical data |
| 08/11/1987 | US4686454 Conductor tracer with improved open circuit detection, close-range discrimination and directionality |
| 08/04/1987 | US4684946 Device for transmitting to the surface the signal from a transmitter located at a great depth |
| 08/04/1987 | US4684888 Apparatus subject to random accelerative motion for sensing motion of a magnetically susceptible part |
| 07/29/1987 | EP0229991A2 Apparatus for protection against metallic objects |
| 07/29/1987 | EP0229831A1 Electromagnetic bone healing sensor |
| 07/28/1987 | US4683461 Inductive magnetic field generator |
| 07/22/1987 | EP0229424A2 Time-domain induced polarization logging method and apparatus |
| 07/21/1987 | US4682157 Polar fluid detection system unaffected by power line voltages |
| 07/16/1987 | DE3600446A1 Location of extended conductors running in or under dielectric layer - has electrode movable in relation to conductor in coupling position and capacitive coupling measuring unit |
| 07/14/1987 | CA1224258A1 Electromagnetic detector for metallic materials |
| 07/14/1987 | CA1224257A1 Device for detecting metallic objects in a flow of non-metallic material |
| 07/14/1987 | CA1224250A1 Apparatus for orienting a magnetometer |
| 07/08/1987 | EP0227966A1 Inductive proximity switch |
| 07/07/1987 | US4679032 Procedure and means for producing a contrast image |
| 07/07/1987 | US4678997 Method and apparatus for dielectric well logging of subsurface earth formations with a lumped constant antenna |
| 07/07/1987 | US4678994 Methods and apparatus employing apparent resonant properties of thin conducting materials |
| 07/07/1987 | US4678992 Electronic metal detector |
| 07/07/1987 | US4678371 Burying device for submarine cables and method for guiding the same |
| 07/07/1987 | CA1223936A1 Tactile sensor array: robotic system and manufacturing method utilizing same |
| 07/01/1987 | EP0226574A1 Magnetoresistive sensor for producing electric signals. |
| 07/01/1987 | CN86105110A System and method for data processing |
| 07/01/1987 | CN85204797U Ferromagnetics-detecting device utilizing magnetic field |
| 06/30/1987 | US4677438 Method and apparatus for detecting an object or a condition indicating a defect in a medium |
| 06/30/1987 | US4677425 Apparatus for detecting metal debris particles |
| 06/30/1987 | US4677386 Method of interpreting impedance distribution of an earth formation obtained by a moving array using end emitting current electrodes sequentially activated and a series of potential electrodes |
| 06/30/1987 | US4677385 Methd of logging an earth formation penetrated by a borehole to provide an estimate of impedance distribution with depth using end emitting current electrodes sequentially activated and a multiplicity of potential electrodes of a moving logging array |
| 06/30/1987 | US4677384 Target-identifying metal detector |
| 06/30/1987 | CA1223637A1 Method for geophysical prospecting of complex orebodies |
| 06/23/1987 | US4675658 System including tuned AC magnetic field transmit antenna and untuned AC magnetic field receive antenna |
| 06/23/1987 | US4675611 Method of logging an earth formation penetrated by a borehole to provide an improved estimate of impedance distribution of the formation |
| 06/23/1987 | US4675610 Method of logging an earth formation penetrated by a borehole to provide an improved estimate of impedance distribution with depth using a single continuously emitting current electrode and a multiplicity of potential electrodes of a moving logging array |
| 06/23/1987 | US4675606 Magnetometers for detecting metallic objects in earth's magnetic field |
| 06/09/1987 | US4672321 Method and apparatus for electromagnetically surveying a remote elongate conductor employing a detector assembly having plural electromagnetic transducer assemblies |
| 06/04/1987 | WO1987003380A1 Metal detector sensing head with reduced eddy current coils |
| 06/02/1987 | US4670717 Borehole antenna array for determining radar incidence direction |
| 05/27/1987 | EP0222805A1 Method and apparatus for detecting metals. |
| 05/27/1987 | EP0100324B1 A system for localizing laid cables or pipes |
| 05/20/1987 | EP0222028A1 Metal detector for detecting metal objects |
| 05/13/1987 | EP0221234A1 Apparatus for detecting power lines |
| 05/12/1987 | US4665486 Method and apparatus for reducing statistical variations in nuclear well logs |
| 05/06/1987 | EP0220457A1 Method and apparatus for investigating ferromagnetic objects deposited in non-magnetic materials |
| 05/05/1987 | US4663612 Pattern-comparing security tag detection system |
| 05/05/1987 | US4663593 Method of electromagnetic exploration |
| 04/29/1987 | EP0219855A2 Method for searching and sounding inhomogeneities, and circuitry for carrying out this method |
| 04/28/1987 | US4661799 Loop detector |
| 04/23/1987 | WO1987002324A1 A magnetic self-ranging system for use in the degaussing of ships |
| 04/22/1987 | EP0219234A2 Method for identifying complex lithologies of subsurface formations |
| 04/22/1987 | EP0218669A1 Device for detecting underground cables |
| 04/21/1987 | US4659993 Apparatus including an equipotential housing and plurality of focused current electrodes for electrically logging a well formation at more than one lateral distance from a borehole |
| 04/21/1987 | US4659992 Method and apparatus for electromagnetic logging with reduction of spurious modes |
| 04/21/1987 | US4659989 Inductively balanced metal detector circuit with orthogonal balancing signals and including phase and polarity detection |
| 04/21/1987 | CA1220816A1 Geophysical prospecting system for passive analysis of telluric currents and method therefor |
| 04/14/1987 | US4658215 Method for induced polarization logging |
| 04/07/1987 | US4656422 Oil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well bores |
| 04/01/1987 | EP0216128A1 Synchronous detector |
| 04/01/1987 | EP0216070A1 Instrument for sensing ferromagnetic bodies |
| 03/31/1987 | US4654598 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, and the degree of melting of ice and to predict in situ stress-strain behavior |
| 03/31/1987 | CA1219906A1 Method and apparatus for measuring earth formation resistivity |
| 03/25/1987 | EP0215695A1 Process for localizing an object and determining its orientation in space, and apparatus therefor |
| 03/25/1987 | EP0215266A2 System including tuned AC magnetic field transmit antenna and untuned AC magnetic field receive antenna |
| 03/25/1987 | EP0215244A2 Inductive magnetic field generator |
| 03/25/1987 | EP0215242A2 Selector for AC magnetic inductive field receiver coils |
| 03/24/1987 | US4652864 Microwave proximity sensor |
| 03/24/1987 | US4652861 Method and apparatus for protecting buried optical fiber cable |
| 03/24/1987 | US4652829 Electromagnetic logging apparatus with button antennas for measuring the dielectric constant of formation surrounding a borehole |
| 03/24/1987 | US4652828 Method and apparatus for determining dielectric permittivity of subsurface formations |
| 03/18/1987 | EP0214286A1 Dielectric methods and apparatus for in-situ soil classification |
| 03/17/1987 | US4651101 Induction logging sonde with metallic support |
| 03/17/1987 | US4651100 Antenna construction for well logging of subsurface earth formations |
| 03/17/1987 | US4649755 Sensor for magnetizable materials |
| 03/12/1987 | WO1987001463A1 Metal detector using amplitude cross-correlation |
| 03/11/1987 | EP0214037A2 System and method for data processing |
| 03/10/1987 | US4649375 For use with a crane |
| 03/10/1987 | US4648710 Blind guide device |
| 03/10/1987 | CA1219039A1 Electrode structure to measure borehole resistivity |
| 03/04/1987 | EP0212324A2 Contactless method for testing electrically conductive objects, and apparatus for carrying out this method |
| 03/04/1987 | EP0212275A2 Method for determining the limits of underground natural gas layers |
| 03/03/1987 | US4647910 Selector for AC magnetic inductive field receiver coils |
| 02/24/1987 | US4646067 Security bar rack |
| 02/24/1987 | US4646026 Method and apparatus for measuring resistivity of an earth formation |
| 02/24/1987 | US4646025 Magnetic probe exploration device for determining residual fossil magnetization of well hole rocks |
| 02/24/1987 | US4646022 Computer-linked nuclear magnetic logging tool and method having a sham polarizing cycle for rapidly dispersing components of residual polarization associated with a prior-in-time NML collection cycle |
| 02/24/1987 | US4646021 Computer-linked nuclear magnetic logging tool and method having slowly rising polarizing field turn-on segments for rapidly dispersing precessing components of residual polarization associated with a prior-in-time NML collection cycle |
| 02/24/1987 | US4646020 Computer-linked nuclear magnetic logging tool and method for rapidly dispersing components of residual polarization associated with a prior-in-time NML collection cycle |
| 02/24/1987 | US4646019 Computer-linked nuclear magnetic logging tool and method having a sham polarizing cycle for rapidly dispersing components of residual polarization associated with a prior-in-time NML collection cycle as well as reduce tuning errors during ring down |
| 02/24/1987 | US4646018 Computer-linked NML tool and method having a series of sham polarizing cycles for rapidly dispersing components of residual polarization associated with a prior-in-time NML collection cycle as well as reduce tuning errors during ring down |
| 02/24/1987 | US4646017 Computer-linked nuclear magnetic logging tool and method for rapidly dispersing components of residual polarization associated with a prior-in-time collection cycle as well as reduce tuning errors during ring down |
| 02/24/1987 | US4646016 Computer-linked nuclear magnetic logging tool and method having a series of sham polarizing cycles for rapidly dispersing components of residual polarization associated with a prior-in-time NML collection cycle |
| 02/24/1987 | US4646015 Flux gate sensor with improved sense winding gating |
| 02/24/1987 | CA1218412A1 Method and apparatus for deconvolving apparent conductivity measurements in induction well logging |
| 02/17/1987 | US4644286 Article surveillance system receiver using synchronous demodulation and signal integration |
| 02/17/1987 | US4644283 In-situ method for determining pore size distribution, capillary pressure and permeability |
| 02/12/1987 | WO1987000933A1 Detector device |
| 02/12/1987 | DE3527650A1 Method and circuit arrangement |
| 02/10/1987 | US4642786 Method and apparatus for position and orientation measurement using a magnetic field and retransmission |
| 02/10/1987 | US4642570 Method and apparatus for complex resistivity measurements with elimination of electromagnetic coupling effects |
| 02/10/1987 | CA1217815A Multiplex submersible pump telemetry system |
| 02/10/1987 | CA1217814A Nuclear magnetic resonance method and apparatus for remote detection and volumetric measurement of petroleum reserves |