| 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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| 03/24/1981 | US4258321 Radio geophysical surveying method and apparatus |
| 03/24/1981 | US4258320 Apparatus and method employing foam sleeves for supporting magnetic sensors in a tubular housing |
| 03/24/1981 | US4258279 Magnetic sensor assembly |
| 03/11/1981 | EP0024961A1 Method of transient current geophysical prospecting |
| 03/11/1981 | EP0024867A1 Apparatus for the detection of stagnant particles |
| 03/10/1981 | US4255711 Coil arrangement for search head of a metal detector |
| 03/10/1981 | US4255710 Plural search frequency directional metal detector apparatus having enhanced sensitivity |
| 03/03/1981 | CA1096939A1 Apparatus and method for determination of subsurface porosity |
| 02/25/1981 | EP0024183A1 A method of detecting faults in the electrically conductive sheath of an electric cable |
| 02/24/1981 | US4253063 Impedance measuring method of and apparatus for detecting escaping leach solution |
| 02/17/1981 | US4251773 Method and apparatus for exploration of geological formation tilt in boreholes |
| 02/10/1981 | US4250451 Magnetic induction imaging system |
| 02/10/1981 | CA1095607A1 Microwave ice detector |
| 02/03/1981 | US4249129 Efficient simultaneous electromagnetic transmission or reception at different frequencies in electromagnetic mapping |
| 02/03/1981 | US4249128 Wide pulse gated metal detector with improved noise rejection |
| 01/27/1981 | US4247898 Apparatus for computing the change in bearing of an object |
| 01/27/1981 | US4247821 Transient electromagnetic prospecting apparatus possessing noise supression features |
| 01/20/1981 | US4246538 Method of investigating the electrical resistivity of the ground and apparatus for use in the method |
| 01/13/1981 | US4245191 Method and apparatus for detecting and measuring inclusions in subsoil |
| 01/13/1981 | CA1093655A1 Intrusion or movement detector |
| 12/30/1980 | CA1092651A1 Geodetic survey method |
| 12/24/1980 | WO1980002878A1 Method of installing electrode unit for bed detection |
| 12/23/1980 | CA1092191A1 Electromagnetic wave logging system for determining resistivity and dielectric constant of earth formations |
| 12/16/1980 | US4239010 Microwave seed sensor for field seed planter |
| 12/12/1980 | EP0014204A4 Metal type detector for drill pipes. |
| 12/11/1980 | WO1980002718A1 Method of drilling productive stratum |
| 11/25/1980 | US4236113 Electrical well logging tool, having an expandable sleeve, for determining if clay is present in an earth formation |
| 11/18/1980 | US4233839 Apparatus and method for determining characteristics of subsurface formations |
| 11/11/1980 | US4233561 Automatic impedance matching conduit locator |
| 11/04/1980 | US4232286 Apparatus to indicate the spacing between a vehicle and a metal article |
| 11/04/1980 | US4232285 Electromagnetic detector responsive to a modification of a magnetic field |
| 10/29/1980 | EP0017801A1 Amorphous antipilferage marker and detection system comprising same |
| 10/29/1980 | EP0017682A2 Method and system for geophysical induction surveying |
| 10/28/1980 | US4230685 Method of magnetic separation of cells and the like, and microspheres for use therein |
| 10/28/1980 | CA1088624A1 Electromagnetic wave propagation well logging utilizing multiple phase shift measurement |
| 10/15/1980 | EP0017597A1 Satellite earth observation system |
| 10/15/1980 | EP0017547A1 Proximity detector and use thereof |
| 10/14/1980 | US4228395 Feature recognition system |
| 10/07/1980 | CA1087271A1 Detecting different fluids, such as oil at the surface of water |
| 10/01/1980 | EP0016552A1 Method of magnetic separation of cells and the like, and microspheres for use therein |
| 09/16/1980 | CA1085922A1 Induced polarization prospecting method |
| 09/02/1980 | US4220913 Apparatus for and methods of electromagnetic surveying of elongated underground conductors |
| 08/26/1980 | US4219776 Method and apparatus for measuring in situ density and fabric of soils |
| 08/26/1980 | US4219773 Well casing finder instrument with movable magnet and magnetically operated switch |
| 08/26/1980 | US4219740 Proximity sensing system and inductance measuring technique |
| 08/20/1980 | EP0014204A1 Metal type detector for drill pipes. |
| 08/19/1980 | US4218678 Synthetic pulse radar including a microprocessor based controller |
| 08/19/1980 | CA1084114A1 Logging probe for making redox potential measurements |
| 07/29/1980 | US4215341 Intrusion or movement detector |
| 07/22/1980 | CA1082308A1 Method and apparatus for determination for adsorbed fluid in subsurface formations |
| 07/15/1980 | US4213093 Portable buried object detection system with error reducing signal processing |
| 07/09/1980 | EP0013224A1 Method and apparatus for measuring the resistivity of fluids in a borehole |
| 07/09/1980 | EP0013068A1 Hydrocarbon prospecting method for the indirect detection of hydrocarbon reservoirs |
| 07/08/1980 | CA1081343A1 Float detecting device for pressurized slurry transfer apparatus |
| 07/01/1980 | US4210869 Rotating telluric field measurements |
| 07/01/1980 | US4210868 Method for detecting an underground flame front using resistance probes |
| 07/01/1980 | US4210867 Induction coil method for detecting underground flame fronts |
| 07/01/1980 | US4210865 Position sensor of linearly moving bodies |
| 07/01/1980 | CA1080821A1 Metal detector |
| 07/01/1980 | CA1080802A1 Dielectric well logging means and method |
| 07/01/1980 | CA1080801A1 Dielectric well logging system and method |
| 06/24/1980 | US4209747 Apparatus and method for determination of subsurface permittivity and conductivity |
| 05/28/1980 | EP0011536A2 Warning device, process for its manufacture and detecting apparatus therefor |
| 05/20/1980 | US4204160 Metal detector circuit with automatic optimum sensitivity adjustment |
| 05/20/1980 | CA1078015A1 Method and apparatus for determination for absorbed fluid in subsurface formations |
| 04/22/1980 | US4199720 Method for investigating the conductivity of layered terrain |
| 04/15/1980 | US4198596 Device for direct and continuous receiving and measuring of electrical magnetic and acoustic signals |
| 04/08/1980 | CA1075314A1 Method and apparatus for detecting faults in buried insulated conductors |
| 04/01/1980 | US4196391 Metal locator with stereotonic indication of translateral position |
| 03/04/1980 | US4191894 Proximity detector |
| 03/04/1980 | CA1073076A1 Beat frequency interference rejection circuitry |
| 02/26/1980 | CA1072653A1 Theft detection system |
| 02/12/1980 | CA1071708A1 Placement of an induced polarization electrode in a drill hole |
| 02/05/1980 | CA1071307A2 Flux valve heading repeater compensation systems |
| 01/22/1980 | US4185238 Apparatus and method for determination of subsurface permittivity and conductivity |
| 01/08/1980 | US4182986 Test, control and gauging method using locked oscillators |
| 01/08/1980 | US4182985 Magnetoresistor bridge probe for locating the position of a magnetic tube support sheet of a nonmagnetic heat exchange conduit |
| 01/01/1980 | US4181879 Mine search coil simulator |
| 12/12/1979 | EP0005872A1 Means for water bottom logging |
| 12/04/1979 | US4176555 Signal amplifier system for controlled carrier signal measuring sensor/transducer of the variable impedance type |
| 11/27/1979 | US4176348 Electronic security device |
| 11/20/1979 | US4175251 Nuclear magnetism logging method and system |
| 11/06/1979 | US4173228 Catheter locating device |
| 11/01/1979 | WO1979000855A1 Metal type detector |
| 10/16/1979 | US4171031 Well logging instrument guide apparatus |
| 10/16/1979 | CA1064584A1 Pulse generator using lc circuit to energize a coil |
| 09/18/1979 | CA1062777A1 Method and apparatus for determining permeable zones in subsurface earth formations |
| 09/11/1979 | CA1062333A1 Movable oil measurement combining dual radio frequency induction and dual induction laterolog measurements |
| 08/21/1979 | US4165480 Prospecting system using rotating superconducting electromagnetic dipole |
| 08/21/1979 | CA1060970A1 Apparatus and method for improving signal discrimination in an electronic detection system |
| 08/21/1979 | CA1060952A1 Method and apparatus for detecting faults in buried insulated conductors |
| 08/07/1979 | US4163977 Double loop receiver-transmitter combination |
| 08/07/1979 | US4163877 Housing for circuitry and loudspeaker of a magnetic locator shields and resiliently mounts the loudspeaker |
| 08/07/1979 | CA1060115A1 Proximity switch |
| 07/17/1979 | US4161687 Method for locating underground anomalies by diffraction of electromagnetic waves passing between spaced boreholes |
| 07/17/1979 | US4161686 Concealed structure tracing translator apparatus including position sensitive bitonic indication means |
| 07/17/1979 | US4161685 Solid state proximity switch |
| 07/17/1979 | US4161659 Solid state proximity switch |
| 07/17/1979 | CA1058704A1 Enclosed nuclear-magnetism logging tool with compensated coil-isolating system |
| 07/03/1979 | US4159638 Thermistor detector circuit and discriminating network for heat absorptive media |