| 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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| 09/25/1990 | CA1274598A1 Apparatus having capacitive sensor and metal detector for detecting objects concealed behind surfaces |
| 09/20/1990 | WO1990010880A1 Process and device for locating submarines |
| 09/20/1990 | WO1990010879A1 Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables |
| 09/20/1990 | DE4007200A1 Hall effect measuring device - has Hall integrated circuit supported by spring in precise position e.g. for crankshaft angle sensor for IC engine ignition timing |
| 09/19/1990 | EP0388317A1 Process and device for localising a well with metallic casing from another well |
| 09/19/1990 | EP0388041A2 Apparatus for determining direction to and position of an underground conductor |
| 09/19/1990 | EP0387781A2 Ferrous object sensor assembly |
| 09/18/1990 | US4958286 Time-variant filter coefficients |
| 09/13/1990 | DE4001705A1 Vehicle acceleration limiting value switch with ball inertia body - has rocker in base of spherical segment and permanent magnet arranged at end of arm of rocker working with hall transmitter |
| 09/12/1990 | EP0386134A1 Antenna system for magnetic and resonant circuit detection. |
| 09/12/1990 | EP0386108A1 Downhole pulse radar |
| 09/12/1990 | EP0222805B1 Method and apparatus for detecting metals |
| 09/05/1990 | EP0385856A2 Method and apparatus for measuring wellbore diameter using electromagnetic waves |
| 09/05/1990 | EP0385672A2 Induction coil driver |
| 09/05/1990 | EP0385575A2 Proximity sensor and method of making |
| 09/04/1990 | US4954812 Magnetic field alarm indicator |
| 09/04/1990 | CA1273693A1 Search coil assembly for metal detectors and method for making same |
| 09/03/1990 | CA2011390A1 Method and apparatus for measuring wellbore diameter using electromagnetic waves |
| 09/02/1990 | CA2008492A1 Proximity sensor and method of making |
| 09/01/1990 | CA2008442A1 Induction coil driver |
| 08/29/1990 | EP0384823A1 Process and device to determine the resistivity of geological formations |
| 08/29/1990 | EP0268580B1 Magnetic field-dependent, inductive proximity switch |
| 08/23/1990 | WO1990009601A1 Conductor tracing system |
| 08/23/1990 | WO1990009582A1 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 |
| 08/23/1990 | DE4004171A1 Tear detector for mechanical loading test sample - uses capacitive sensor coupled via impedance converter to electronic evaluation circuit |
| 08/22/1990 | EP0382802A1 Measurement probe for locating metallic objects in the human or animal body |
| 08/21/1990 | US4951055 Apparatus for detecting materials buried under the ground |
| 08/21/1990 | US4950995 Method of treating a well bore in connection with electric logging of subsurface formation |
| 08/21/1990 | US4950985 Apparatus for measuring electromagnetic values of a coil, in particular for measuring the position of armature of a coil/armature magnetic system |
| 08/21/1990 | US4949452 Method for making search coil assembly for metal detectors |
| 08/16/1990 | DE4004170A1 Arrangement to detect material failure in structural materials - having probe elements, differential amplifier computer and recording or warning signal unit |
| 08/14/1990 | US4949045 Well logging apparatus having a cylindrical housing with antennas formed in recesses and covered with a waterproof rubber layer |
| 08/14/1990 | US4949037 System for detecting metal in articles using phase change of detection signals |
| 08/01/1990 | EP0379804A2 Transient electromagnetic apparatus for detecting irregularities on conductive containers |
| 08/01/1990 | CN1044345A Excited polarization method with screen transition |
| 07/31/1990 | US4945310 Passive geophysical survey method based upon the detection of the DC component of the vertical electrical potential of natural earth currents |
| 07/31/1990 | US4945309 Method of reducing impulsive noise in electromagnetic geophysical data |
| 07/31/1990 | CA2008783A1 Method for detecting metal objects |
| 07/24/1990 | US4943770 Device for accurately detecting the position of a ferromagnetic material inside biological tissue |
| 07/18/1990 | EP0378179A2 Microwave proximity switch |
| 07/17/1990 | US4942528 Dipmeter processing technique |
| 07/17/1990 | US4942361 Method and apparatus for determining earth resistivities in the presence of extraneous earth currents |
| 07/17/1990 | US4942360 A method and apparatus of discrimination detection using multiple frequencies to determine a recognizable profile of an undesirable substance |
| 07/12/1990 | WO1990007760A1 Electronic article surveillance system with improved differentiation |
| 07/12/1990 | WO1990007705A1 Arrangement for detecting metallic particles carried by a fluid |
| 07/11/1990 | CN1043792A Electroseismic prospecting |
| 07/10/1990 | US4940943 Method and apparatus for optimizing the reception pattern of the antenna of a propagating electromagnetic wave logging tool |
| 07/09/1990 | CA2007310A1 Electronic article surveillance system with improved differentiation |
| 07/03/1990 | US4939460 Indigenous electromagnetic radiation based method for detecting geologic deposits |
| 06/27/1990 | EP0375499A1 Magnetic-detection method, and apparatus for carrying out this method |
| 06/26/1990 | US4937580 Geophysical radar apparatus and method |
| 06/26/1990 | CA1270917A1 Method and apparatus for detecting slag in a flowing molten metal |
| 06/26/1990 | CA1270902A1 Nuclear magnetic resonance sensing apparatus and techniques |
| 06/20/1990 | EP0373421A2 Method and apparatus for forcasting seismic events |
| 06/20/1990 | CA2005763A1 Magnetic detection method and device |
| 06/19/1990 | CA1270502A1 Steel cable activated magnetic switch |
| 06/14/1990 | WO1990006488A1 Instrument for measuring reinforcing bars |
| 06/12/1990 | US4933640 Apparatus for locating an elongated conductive body by electromagnetic measurement while drilling |
| 06/12/1990 | US4933638 Borehole measurement of NMR characteristics of earth formations, and interpretations thereof |
| 06/06/1990 | EP0371489A2 Oscillation circuit for proximity switch |
| 06/06/1990 | EP0371261A2 Method for inductively generating electric measuring signal for determining the park and/or position and/or material properties of a test sample, proximity sensor constructed according to this method and its use as a proximity switch |
| 06/05/1990 | US4931740 Electrostatic field gradient sensor |
| 06/05/1990 | US4931739 Meter for measuring the electric charge of a body |
| 06/05/1990 | US4931736 Method of and apparatus for microelectric measuring of inhomogeneities on the walls of boreholes for use in well logging |
| 05/31/1990 | WO1990005923A1 Apparatus and method for electrically prospecting the subsoil |
| 05/30/1990 | EP0370377A2 Inductive proximity sensor |
| 05/30/1990 | CN1008219B Vertical image method for mapping anomalous phenomena in the stratum |
| 05/29/1990 | US4929915 For a logging probe |
| 05/29/1990 | CA1269710A1 Method for determining the distance between adjacent wells |
| 05/17/1990 | WO1990005299A1 Detection of non-metallic materials |
| 05/16/1990 | EP0368762A2 Multifrequency signal transmitter for an array induction well logging apparatus |
| 05/15/1990 | US4926127 Apparatus for the detection of metal objects located within a poor electrically conductive environment |
| 05/15/1990 | US4926120 In-line metallic debris particle detection system |
| 05/15/1990 | CA1269143A1 Metal detector for intake of field chopper |
| 05/14/1990 | EP0329709A4 Methods and apparatus for measurement of electronic properties of geologigal formations through borehole casing. |
| 05/09/1990 | EP0367494A2 Method and apparatus for oil and gas exploration |
| 05/09/1990 | EP0366719A1 Extended range, pulsed induction logging tool and method of use. |
| 05/03/1990 | WO1990004697A1 Downhole combination tool |
| 05/02/1990 | EP0366567A2 Downhole combination tool |
| 05/02/1990 | EP0366221A2 Buried metal detector |
| 04/24/1990 | CA1268230A1 Device for sensing the number of items stored in a compartment |
| 04/19/1990 | WO1990004242A1 Supervision and control of airport lighting and ground movements |
| 04/19/1990 | WO1990004169A1 Method and apparatus for detecting particular substance |
| 04/11/1990 | EP0363259A2 Width determination of fractures intersecting a borehole |
| 04/11/1990 | CN1041222A Proton-rotating magnetometer |
| 04/10/1990 | US4916400 Method for determining characteristics of the interior geometry of a wellbore |
| 04/10/1990 | EP0256004A4 Proximity sensing device. |
| 04/10/1990 | CA1267707A1 Above-ground arrangement for and method of locating a discrete inground boring device |
| 04/04/1990 | EP0361456A2 Magnetic sensor |
| 04/04/1990 | EP0360845A1 Metal detector |
| 04/04/1990 | CN2055603U Object searching head of ultra-narrow band vlf type detector |
| 04/03/1990 | US4914421 Detector for disc records |
| 04/03/1990 | US4914399 Induction coil driver |
| 03/28/1990 | EP0359767A1 Locating process for localizing unknown receiver or transmitter positions. |
| 03/27/1990 | US4912415 Sonde of electrodes on an earth drill for measuring the electric formation resistivity in earth strata |
| 03/27/1990 | US4912414 Induction-type metal detector with increased scanning area capability |
| 03/27/1990 | CA1267192A1 Ferrous object locator and classifier |
| 03/21/1990 | EP0261227A4 Capacitive sensor and metal detector for detecting concealed objects. |
| 03/21/1990 | EP0201525B1 Device for localizing metal objects in a human or animal body |
| 03/14/1990 | EP0358342A1 A microwave radiometer |