| Patents for G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation (25,929) |
|---|
| 03/14/1990 | CN1040439A Electromagnetic instruments for imaging structure in geologic formations |
| 03/13/1990 | US4907346 Terrestrial magnetic sensor |
| 03/06/1990 | US4906973 Walk-through metal detector |
| 03/06/1990 | US4906928 Transient electromagnetic apparatus with receiver having digitally controlled gain ranging amplifier for detecting irregularities on conductive containers |
| 03/06/1990 | US4906926 Proximity sensor for hostile environments |
| 03/06/1990 | US4906925 Apparatus for detecting conductive materials in a moving flow |
| 02/27/1990 | US4904943 Method for detecting long waves and predicting earthquakes |
| 02/27/1990 | US4904942 Electroseismic prospecting by detection of an electromagnetic signal produced by dipolar movement |
| 02/27/1990 | US4903395 Method for making search coil assembly for metal detectors |
| 02/27/1990 | CA1266311A1 Method, system and apparatus for magnetic surveillance of articles |
| 02/21/1990 | CN1039869A Modal transmission method and apparatus for multi-conductor wireline cables |
| 02/20/1990 | US4902997 Search coil assembly for metal detectors |
| 02/20/1990 | US4902981 Well casing potential measurement tool with compensated DC errors |
| 02/20/1990 | US4902976 Probe for detecting the presence of magnetic material in a ground hole |
| 02/20/1990 | CA1266107A1 Metal detector system with automatic ground exclusion balance feature |
| 02/13/1990 | US4901023 Methods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formations |
| 02/08/1990 | WO1990001104A1 A system and method for locating an underground probe |
| 02/07/1990 | CN2052542U Ground detector with electromagnetic pulse |
| 02/06/1990 | US4899112 Well logging apparatus and method for determining formation resistivity at a shallow and a deep depth |
| 01/31/1990 | EP0353035A2 Foreign matter detector |
| 01/31/1990 | EP0352869A2 Modal transmission method and apparatus for multi-conductor wireline cables |
| 01/30/1990 | US4897605 Deep penetration well logging system and method |
| 01/25/1990 | WO1990000749A1 Method and apparatus for selectively detecting objects |
| 01/25/1990 | WO1990000748A1 Metal/mineral detector with received signal sampling |
| 01/23/1990 | US4896117 Method of and apparatus for tracing faults in electrical conductors |
| 01/23/1990 | US4896116 Pulse radar method and apparatus for detecting an object |
| 01/23/1990 | CA1264840A1 Identification system |
| 01/16/1990 | US4894619 Impulse induced eddy current type detector using plural measuring sequences in detecting metal objects |
| 01/16/1990 | US4894618 Metal detector using cross-correlation between components of received signals |
| 01/16/1990 | US4894617 Device for locating steel rods buried in high-density reinforced concrete |
| 01/11/1990 | WO1990000288A1 Method and device for mapping out a path of an underground conduct |
| 01/11/1990 | WO1990000259A1 System for detecting the location and orientation of an object |
| 01/11/1990 | WO1990000030A1 Measurement probe for locating metallic objects in the human or animal body |
| 01/10/1990 | CN1006413B Metal detector |
| 01/09/1990 | US4893084 Formation electromagnetic parameters measuring tool using transmitter reference and reflected signals and a received signal |
| 01/09/1990 | US4891980 Liquid level gauge |
| 01/09/1990 | CA1264363A1 Search coil assembly for metal detector and method for making same |
| 01/03/1990 | EP0349516A1 Method and apparatus for mapping out a path of an underground conduct |
| 01/03/1990 | EP0349110A2 Ground probing radar method and apparatus |
| 01/03/1990 | EP0348606A2 Method and apparatus for verifying the presence of ferromagnetic components in an assembly |
| 01/03/1990 | EP0348386A1 Geoelectrical process based on structural geology calibration for determining hydraulic characteristic values. |
| 01/02/1990 | US4891627 Device for detecting object |
| 12/28/1989 | WO1989012916A1 Antenna system for magnetic and resonant circuit detection |
| 12/27/1989 | EP0348049A2 Surveying of boreholes |
| 12/27/1989 | CA1264087A1 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 |
| 12/27/1989 | CA1264086A1 Method of interpreting impedance distribution of an earth formation penetrated by a borehole using precursor data provided by a moving logging array having a single continuously emitting current electrode and a multiplicity of potential electrodes |
| 12/26/1989 | US4890064 Metal detector sensing head with reduced eddy current coils |
| 12/26/1989 | US4890053 Method and apparatus for detecting a missing object in a set of objects |
| 12/19/1989 | US4888745 Apparatus for marking individual points of an underwater construction |
| 12/14/1989 | DE3819880A1 Method for determining the course of power cables under tension, and a device and two-terminal (two-port) network of periodically varying impendance for carrying out the method |
| 12/12/1989 | US4887040 Device for measuring the impedance of a medium along a measurement line |
| 12/12/1989 | US4887024 Person detecting device |
| 12/05/1989 | US4885540 Automated nuclear magnetic resonance analysis |
| 12/05/1989 | US4885536 Magnetic process for determining a trajectory for finding a magnetic object and apparatus for performing the process |
| 11/29/1989 | EP0343744A2 Method of and apparatus for carrying out measurements on open and closed fractures in a hard rock formation pierced by a borehole |
| 11/28/1989 | US4884030 Method and system for acquisition and separation of the effects of electromagnetic fields to predict earthquakes |
| 11/28/1989 | US4883264 Bill disbursing system |
| 11/28/1989 | CA1263440A1 Oil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well bores |
| 11/23/1989 | EP0342920A2 Method for downhole measurement of formation parameters |
| 11/21/1989 | US4882542 Methods and apparatus for measurement of electronic properties of geological formations through borehole casing |
| 11/15/1989 | EP0341994A2 System and method with passive resonant circuit markers for locating buried electrical conductors |
| 11/15/1989 | EP0341906A2 A security system |
| 11/15/1989 | EP0226574B1 Magnetoresistive sensor for producing electric signals |
| 11/15/1989 | CN2047792U Electrically prospecting instrument using microcomputer |
| 11/14/1989 | US4881062 Yarn break detector for spinning and weaving machines |
| 11/14/1989 | US4881036 Phase shift compensation for metal detection apparatus |
| 11/08/1989 | EP0341109A1 Method for evaluating the organic material content of sediments from data acquired by borehole logging probes |
| 11/02/1989 | EP0340034A2 Random-filament, multi-directionally responsive marker for use in electronic article surveillance systems |
| 10/24/1989 | US4876511 Method and apparatus for testing and calibrating an electromagnetic logging tool |
| 10/19/1989 | DE3811887A1 Automatic gripping device for a composite component |
| 10/18/1989 | EP0337783A2 Foreign matter detector |
| 10/18/1989 | EP0337623A2 Method and apparatus for detecting the absence of an object from a set of objects |
| 10/17/1989 | US4875015 Multi-array borehole resistivity and induced polarization method with mathematical inversion of redundant data |
| 10/17/1989 | US4875014 System and method for locating an underground probe having orthogonally oriented magnetometers |
| 10/11/1989 | EP0198910B1 Process and device for detecting slag |
| 10/10/1989 | US4873533 Marker for locating a buried object |
| 10/10/1989 | US4873494 Inductive loop presence detector with cross talk filter |
| 10/10/1989 | US4873488 Induction logging sonde with metallic support having a coaxial insulating sleeve member |
| 10/05/1989 | WO1989009417A1 Detector |
| 09/26/1989 | US4870381 Search coil assembly for metal detectors |
| 09/26/1989 | CA1261031A1 Fluid detection system |
| 09/26/1989 | CA1261000A1 Focussed resistivity sensor |
| 09/26/1989 | CA1260537A1 Conductivity determination in a formation having a cased well |
| 09/26/1989 | CA1260294A1 Roller track monitoring in rolling mills |
| 09/26/1989 | CA1260146A1 Discriminatory detection at a distance |
| 09/26/1989 | CA1260060A1 Coherent detection system for use in induction well logging apparatus |
| 09/20/1989 | EP0332652A1 Method and apparatus for locating leaks in a multiple layer geomembrane. |
| 09/19/1989 | US4868910 Metal detector with microprocessor control and analysis |
| 09/19/1989 | US4868504 Apparatus and method for locating metal objects and minerals in the ground with return of energy from transmitter coil to power supply |
| 09/19/1989 | US4868499 Object detector with feedback which holds constant the product of the transmitter coil current and frequency to maintain constant sensor voltage output |
| 09/19/1989 | US4868488 Use of a dielectric microwave resonator and sensor circuit for determining the position of a body |
| 09/19/1989 | CA1259656A1 Computer-linked nuclear magnetic logging tool and method having series of sham polarizing cycles for rapidly dispensing components of residual polarization associated with a prior-in-time nml collection cycle as well as reduce tuning errors during ring down |
| 09/13/1989 | EP0331728A1 Apparatus for detecting materials buried under the ground |
| 09/12/1989 | US4866446 Method for radar mapping an area and a radar equipment to carry out the method |
| 09/12/1989 | US4866388 System and method with passive resonant circuit markers for locating buried electrical conductors |
| 09/12/1989 | US4866383 Method and apparatus having load cell responsive to movement of a magnetic field generator for differentiating between materials |
| 09/06/1989 | EP0331269A1 Electromagnetic detection system |
| 09/06/1989 | CN1035361A Lony feature vertical or horizontal electrical conductor methodology using phase coherent electromagnetic instrumentation |
| 08/30/1989 | EP0329709A1 Methods and apparatus for measurement of electronic properties of geologigal formations through borehole casing. |
| 08/30/1989 | EP0329652A1 Device for measurement of a magnetic field which is constant or varies over time. |