Patents
Sitemap › G01 - Measuring; Testing › G01V - Geophysics; Gravitational measurements; Detecting masses or objects; Tags › G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
Patents for G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation (25,929)
03/1982
03/09/1982CA1119668A1 Checking method for laterolog
02/1982
02/23/1982US4317079 Buried cable locating system
02/23/1982US4317078 Remote position and orientation detection employing magnetic flux linkage
02/23/1982CA1118867A1 Wide pulse gated metal detector with improved noise rejection
02/16/1982US4316250 Dip determination by statistical combination of displacements
02/10/1982EP0045486A2 Apparatus for determining the distance to a concealed conductive object
02/09/1982CA1118045A1 Method and apparatus for determination of subsurface permittivity and conductivity
02/03/1982EP0045243A2 Multiple-array induction logging tool
02/02/1982US4314339 Method of generating subsurface characteristics models
02/02/1982US4314338 Method of generating subsurface characteristic models
01/1982
01/26/1982US4313164 Method of generating subsurface characteristic models
01/13/1982EP0043768A1 System for permeability logging by measuring streaming potential
01/12/1982US4310807 Digital position sensor including L/C sensing oscillator
01/12/1982US4310797 Stud detector using a magnetically actuated switch with magnetic biasing
01/05/1982US4309697 Magnetic surveillance system with odd-even harmonic and phase discrimination
01/05/1982US4309659 Method for detecting a magnetic source by measuring the magnetic field thereabout
01/05/1982US4309658 Portable, buried object detection system with improved signal processing and presentation
01/05/1982CA1115805A1 Method and apparatus for producing uniform electromagnetic fields in an article detection system
12/1981
12/29/1981US4308499 Method utilizing electromagnetic wave pulses for determining the locations of boundary surfaces of underground mineral deposits
12/08/1981CA1114019A1 Electrode-type logging sonde
12/01/1981US4303879 Metal detector circuit with mode selection and automatic tuning
12/01/1981CA1113576A1 Antipilferage system utilizing "figure-8" shaped field producing and detector coils
11/1981
11/26/1981WO1981003382A1 Method and device for prospecting a well during drilling
11/24/1981US4302723 Apparatus and method for determining dip and/or anisotropy of formations surrounding a borehole
11/24/1981US4302722 Induction logging utilizing resistive and reactive induced signal components to determine conductivity and coefficient of anisotropy
11/18/1981EP0039959A2 Hydrocarbon prospecting method and apparatus for the indirect detection of hydrocarbon reservoirs
11/12/1981WO1981003226A1 Apparatus and method for image reproduction of materials using their magnetic and electric properties
11/10/1981US4300098 Microwave electromagnetic logging with mudcake correction
11/10/1981US4300097 Induction balance metal detector with ferrous and non-ferrous metal identification
11/04/1981EP0039210A1 Method and apparatus for conducting remote surveys of the earth's crust
11/03/1981US4298862 Amorphous antipilferage marker
11/03/1981US4298840 Plural electrode method and means for water bottom logging
10/1981
10/28/1981EP0038551A1 Device for the contactless determination of the position and/or of the dielectric properties of objects
10/28/1981EP0038326A1 Device allowing the detection in solids, liquids or gases, of the metal particles included, the location thereof and the determination of their size
10/20/1981US4296379 Ground prospecting method utilizing electrical resistivity measurements for measuring the resistivity of unit blocks of the ground
10/20/1981CA1111123A1 Electronic theft detection system for monitoring wide passageways
10/13/1981US4295096 Electrode prospecting method providing calculable electromagnetic coupling for the indirect detection of hydrocarbon reservoirs
10/13/1981US4295095 Apparatus and method for detecting the location of metallic objects having alternating current passing therethrough
10/13/1981CA1110728A1 Solid state proximity switch
10/13/1981CA1110697A1 Apparatus and method for determining subsurface formation properties
10/06/1981US4293816 Balanced search loop for metal detector
09/1981
09/23/1981EP0036257A1 Equipment for monitoring a signal current in an elongate conductor
09/22/1981US4291280 AC Generator system having stabilized sensitivity for sensing the presence or absence of a conductive object
09/22/1981US4291271 Method for determining pore size distribution and fluid distribution in porous media
09/22/1981US4291267 Method and apparatus for testing the integrity of the electrical insulation of a well logging sonde
09/16/1981EP0035660A2 Detection of articles in adjacent passageways
09/15/1981US4290020 Method and apparatus for detecting subterranean anomalies by generating two parallel magnetic fields
09/09/1981EP0035421A1 Logging sonde housing and process for its manufacture
09/08/1981US4288748 Method for testing metal detectors
09/02/1981EP0034800A1 Prospecting cable
09/01/1981US4287513 Door knob alarm device
08/1981
08/25/1981US4286218 Multiple site magnetotelluric measurements
08/25/1981US4286217 Device for electrode-type electrical logging tools and tool incorporating said device
08/11/1981US4283681 System for detecting an underwater buried cable
08/11/1981US4283680 Electrical bridge balancing circuit
08/11/1981US4283031 System controlling apparatus which compares signals from sensors monitoring passing objects with pre-determined parameter information to control the system
08/11/1981CA1106932A1 Electronic wall stud sensor
08/04/1981US4282486 Dual focused resistivity logging method and apparatus with dynamic range reduction
08/04/1981CA1106448A1 Device and process for direct and continuous receiving and measuring of electrical magnetic and acoustic signals
07/1981
07/29/1981EP0032727A2 Process for the manufacture of a magnetic pass-through detector
07/29/1981EP0032726A2 Magnetic pass-through detector
07/28/1981US4281321 Surveillance system employing a floor mat radiator
07/28/1981US4281289 Method of determining interwell oil field fluid saturation distribution
07/28/1981US4281242 Balancing apparatus for magnetic circuits employed in data storage and retrieval systems
07/28/1981CA1105996A1 Apparatus and method for determination of bound water in subsurface formations
07/14/1981US4278942 Seal and pressure balance system for an electrode-type logging sonde
07/14/1981US4278941 High frequency induction log for determining resistivity and dielectric constant of the earth
07/07/1981US4277771 Electric induction field navigation apparatus
07/07/1981US4277750 Induction probe for the measurement of magnetic susceptibility
07/07/1981CA1104651A1 Dual guard logging apparatus
07/01/1981EP0030997A2 Digital position sensor
06/1981
06/30/1981US4276599 Method of processing well logging data
06/30/1981US4276484 Method and apparatus for controlling current in inductive loads such as large diameter coils
06/30/1981US4275787 Method for monitoring subsurface combustion and gasification processes in coal seams
06/23/1981US4275353 Method and apparatus for the detection of stagnant regions in a fluidized bed or in pneumatic conveying lines
06/23/1981US4274226 Detection of object in path of moving gate
06/16/1981US4274090 Detection of articles in adjacent passageways
06/16/1981US4274089 Detection system
06/16/1981CA1103310A1 Excitation and mapping of natural gases of the earth's surface
06/16/1981CA1103052A1 Thermistor device for identifying an unknown fluid
06/11/1981WO1981001617A1 A method and apparatus for determining the electrical conductivity of the ground
06/10/1981EP0030218A2 A method and apparatus for determining the electrical conductivity of the ground
06/09/1981US4271763 Proximity detector
06/09/1981CA1102900A1 Magnetic detection means
06/09/1981CA1102899A1 Method and apparatus for the promotion of selected harmonic response signals in an article detection system
06/09/1981CA1102875A1 Method and apparatus for the exploration of boreholes
06/03/1981EP0029673A1 Object detection installation
06/03/1981EP0029560A1 Method of detecting and counting objects
06/02/1981US4271393 Apparatus and method for eddy current detection of subsurface discontinuities in conductive bodies
05/1981
05/12/1981US4267522 L.C. oscillator proximity detector
05/12/1981CA1101064A1 Prospecting system
05/12/1981CA1101063A1 Sub-soil prospecting process
05/05/1981US4266193 Means for detecting metal objects
04/1981
04/30/1981WO1981001198A1 Device allowing the detection in solids,liquids or gases,of the metal particles included,the location thereof and the determination of their size
04/28/1981US4264862 Induction logging device with a pair of mutually perpendicular bucking coils
04/21/1981US4263553 Discriminating metal detector with compensation for ground minerals
04/21/1981US4263552 Translative intelligencer apparatus providing polyindicative response
04/21/1981US4263551 Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object
04/21/1981CA1099783A2 Well tool apparatus and method
03/1981
03/24/1981US4258322 Electromagnetic subsoil prospecting process using an asymptotic low frequency range
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