| 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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| 08/08/1991 | DE4003683A1 Protection of human body against pressure or shocks - involves controlled inflation of suit in response to sensing of e.g. gravity, temp. and body position |
| 08/07/1991 | EP0440370A1 Composite antenna for electronic article surveillance systems |
| 08/07/1991 | CN1053679A Diaguostic filter for detecting conductive and semiconductive particles in fluid stream |
| 08/06/1991 | US5038378 Method and apparatus for smoothing measurements and detecting boundaries of features |
| 08/06/1991 | US5038108 Determing parameters of a geological environment |
| 08/06/1991 | US5038107 Method and apparatus for making induction measurements through casing |
| 08/06/1991 | US5038106 Detector of metalliferous objects having two pairs of receiving loops symmetrical and orthogonal to a driving loop |
| 08/02/1991 | CA2035070A1 Composite antenna for electronic article surveillance systems |
| 07/30/1991 | US5036283 Method and apparatus for measuring the resistivity of earth formations using anti-parallel active and passive focussing electrodes |
| 07/30/1991 | US5035540 Shallow water pipeline tracker system |
| 07/27/1991 | CA2034997A1 Diagnostic filter for detecting conductive and semiconductive particles in a fluid stream |
| 07/25/1991 | WO1991010923A1 Connector for trailing instrumentation |
| 07/25/1991 | WO1991009277A3 Position sensor |
| 07/23/1991 | US5034704 High frequency oscillation type proximity switch |
| 07/23/1991 | US5034690 Method and apparatus for quantitatively determining whether at least one of two or more ferromagnetic components is missing from an assembly |
| 07/23/1991 | US5034689 Detector for detecting foreign matter in an object by detecting electromagnetic parameters of the object |
| 07/18/1991 | CA2031913A1 Sheet detector |
| 07/17/1991 | EP0437364A2 Technique for separating electromagnetic refracted signals from reflected signals in down hole electromagnetic tools |
| 07/17/1991 | EP0436675A1 Process and device for locating submarines. |
| 07/17/1991 | CN1013228B Auto trace harmonization method for proton-rotating magnetometer |
| 07/16/1991 | US5032794 Method and apparatus for monitoring changes in underwater sediment levels |
| 07/16/1991 | US5031896 Sheet detector |
| 07/16/1991 | CA1286390C Method of and system and apparatus for locating and/or tracking stolen or missing vehicles and the like |
| 07/11/1991 | WO1991010092A1 A method and an arrangement for protecting a conductive object from damage by another moving object |
| 07/11/1991 | DE4102606A1 Metal detector for earth or walls - uses analogue multiplier to compare sinusoidal signal of frequency determined by oscillator with probe coil with set frequency |
| 07/11/1991 | CA2033819A1 Technique for separating electromagnetic refracted signals from reflected signals in down hole electromagnetic tools |
| 07/10/1991 | CN1052955A Underground water exploration with secondary time difference in induced polarization and equipment thereof |
| 07/09/1991 | US5030940 Electronic article surveillance tag and method for implementing same |
| 07/09/1991 | US5030913 Multiple sensor magnetometer with temporal noise rejection and controllable spatial response on a moving platform |
| 07/03/1991 | EP0435168A2 Differential coil type proximity switch |
| 07/02/1991 | US5029300 Metal detector protected from malfunction caused by radio waves |
| 07/02/1991 | US5029291 Electromagnetic sensor element and methods and apparatus for making and using same |
| 07/02/1991 | US5029275 Apparatus having floating magnet unit with light reflecting mirror for detecting and indicating to an observer the presence upon a person entering a public place of ferromagnetic material that may be put to harmful use |
| 07/02/1991 | US5028870 Sensor system method and apparatus for discrimination of metallic objects based on a variation in self inductance |
| 06/29/1991 | CA2033304A1 Locatable object suitable for underground use and methods of locating same |
| 06/27/1991 | WO1991009277A2 Position sensor |
| 06/26/1991 | EP0434439A2 Method and apparatus for making induction measurements through casing |
| 06/26/1991 | CN1013002B Electromagnetic instrument for imaging structure in geologic formations |
| 06/26/1991 | CN1013001B Electromagnetic array profiling survey method |
| 06/25/1991 | US5027065 Particle sensor plug with wireless casing connection |
| 06/19/1991 | EP0433110A1 Tubing element forming an electromagnetic borehole source |
| 06/18/1991 | US5025227 Metal detection circuit |
| 06/18/1991 | US5025218 Pulsed field system for detecting the presence of a target in a subsurface environment |
| 06/13/1991 | DE3940894A1 Positionssensor Position sensor |
| 06/12/1991 | EP0431935A2 High pressure proximity sensor |
| 06/12/1991 | EP0431745A2 Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems |
| 06/12/1991 | EP0431343A2 Audible tag for magnetic electronic article surveillance systems |
| 06/11/1991 | US5023551 Nuclear magnetic resonance pulse sequences for use with borehole logging tools |
| 06/11/1991 | US5022484 Logging method and apparatus using a sonde equipped with measuring pads |
| 06/09/1991 | CA2029245A1 Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems |
| 06/06/1991 | CA2020952A1 Audible tag for magnetic electronic article surveillance systems |
| 06/05/1991 | EP0348386B1 Geoelectrical process based on structural geology calibration for determining hydraulic characteristic values |
| 06/04/1991 | US5021767 Method and an apparatus for electronically identifying articles moving along a surface |
| 06/04/1991 | US5021765 Security system having detector means sensitive to the proximity of at least one detected object |
| 06/04/1991 | US5021737 Proximity sensor resistant to axial and torsional forces |
| 06/04/1991 | CA1284674C Extended range, pulsed induction logging tool and method of use |
| 05/22/1991 | EP0428502A1 Device for detecting objects behind a surface |
| 05/22/1991 | EP0428384A2 Universal lattice for magnetic electronic article surveillance system |
| 05/22/1991 | EP0427848A1 Method and device for locating branches in drains |
| 05/22/1991 | CN1051625A Method for receiving electromagnetic radiation before seism and equipment thereof |
| 05/21/1991 | US5016343 Method of making a proximity sensor |
| 05/21/1991 | CA1284357C Sonde for measuring the electric formation resistivity in earth strata |
| 05/16/1991 | WO1991006854A1 Method for use in assessing the physical state of ground materials and apparatus for use therein |
| 05/16/1991 | CA2029938A1 Electromagnetic source for permanent installation into a well |
| 05/16/1991 | CA2026976A1 Universal lattice for magnetic-electronic article surveillance system |
| 05/15/1991 | EP0427288A2 Method for measuring fluctuations of ground, and apparatus therefore |
| 05/15/1991 | EP0426851A1 Apparatus for detecting particular substance |
| 05/08/1991 | EP0426564A2 Method and apparatus for filtering data signals produced by exploration of earth formations |
| 05/08/1991 | EP0426563A2 Method and apparatus for logging spontaneous potential |
| 05/07/1991 | US5014008 System for detecting the location and orientation of a temporarily inaccessible object |
| 05/07/1991 | US5014005 Hall-effect sensor with component positioning element for detecting crankshaft angle |
| 05/02/1991 | EP0425319A2 Method and apparatus for tracking catheters |
| 05/02/1991 | EP0424371A1 Method and apparatus for selectively detecting objects |
| 04/30/1991 | US5012206 Inductive proximity switch |
| 04/30/1991 | US5012193 Method and apparatus for filtering data signals produced by exploration of earth formations |
| 04/25/1991 | DE3934593A1 Security sensor for contactless metal detection - has generator prim. coils coupled to sec. detector coils, pref. via ferrite core |
| 04/24/1991 | EP0424308A2 Geophysical survey system |
| 04/18/1991 | DE3931497A1 Arrangement for detecting contaminants in fluid esp. lubricant - converts flow into rotary flow in sensor head for separation by specific wt. and subsequent measurement |
| 04/17/1991 | EP0422985A1 Process and device for the detection of earth magnetic field inversions by measurements in a borehole |
| 04/16/1991 | US5008660 Electromagnetic detection system |
| 04/16/1991 | US5008625 Method and apparatus for logging and displaying a two dimensional image of spontaneous potential |
| 04/16/1991 | CA1283188C End sensor |
| 04/11/1991 | DE3933630A1 Differential coil arrangement for metal object detection - has whole number of coil segments connected together symmetrical to central main plane |
| 04/10/1991 | CN1050611A Magnetic defect detector for steel strip |
| 04/09/1991 | US5006806 Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as burried fiber optic cables |
| 04/09/1991 | US5006802 Magnetic detection method and device for the implementation thereof |
| 04/09/1991 | US5006791 Electrostatic detector and method for detecting conductors |
| 04/09/1991 | US5005592 Method and apparatus for tracking catheters |
| 04/04/1991 | WO1991004502A1 Induced field mineral value detector |
| 04/03/1991 | EP0420147A1 Magnetic defect detector for steel strip |
| 03/20/1991 | EP0418069A2 Metal detecting apparatus and apparatus for testing metal detecting apparatus |
| 03/20/1991 | EP0417959A2 An assembly for locating the position of an object |
| 03/20/1991 | EP0417242A1 Product monitoring |
| 03/19/1991 | WO1991004503A1 Electronic markers with predetermined spacing |
| 03/19/1991 | US5001675 Phase and amplitude calibration system for electromagnetic propagation based earth formation evaluation instruments |
| 03/19/1991 | US5001430 Apparatus for locating concealed electrical conductors |
| 03/19/1991 | US5001425 Ferromagnetic object detector with comparison of signal maximums from a pair of detection coils |
| 03/19/1991 | US4999920 Surveying of boreholes |
| 03/19/1991 | CA2066602A1 Electronic markers with predetermined spacing |
| 03/13/1991 | EP0416162A1 Innovative stud finder |