Patents
Patents for G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation (25,929)
03/1991
03/13/1991CA2025088A1 Device for locating a boring machine
03/12/1991US4998610 Fare box for a mass transit vehicle
03/09/1991WO1991003746A1 Metal detecting system
03/09/1991CA2064856A1 Metal detecting system
03/05/1991US4998058 Apparatus including transmitter, receiver and display housings for locating corresponding points on opposite sides of a structure
03/05/1991CA1281097C Proximity detector between a metallic mass and an element to which isapplied an electric voltage
03/05/1991CA1281071C Method of magnetotelluric exploration
02/1991
02/26/1991US4996484 Method and apparatus for cancelling powerline noise in geophysical electromagnetic exploration
02/26/1991US4996392 Superconductor magnetic image detection device
02/26/1991CA1280687C Flapper pad arrangement for logging sonde
02/21/1991WO1991002267A1 Electromagnetic scanning system
02/20/1991CN1049288A Medical instrument location means
02/20/1991CN1049287A Therapeutic catheter
02/20/1991CN1011723B Electro magnetic logging apparatus with slot antennas
02/19/1991US4994939 Universal lattice for magnetic-electronic article surveillance system
02/19/1991US4994747 Method and apparatus for detecting underground electrically conductive objects
02/19/1991US4994738 Proximity switch for detecting a magnetic inductive field
02/19/1991US4993325 Magnetic field generator
02/13/1991EP0412900A1 Method and device for investigation of soil by electric prospecting on an aquatic site
02/13/1991EP0412721A2 Multi-directionally responsive, dual-status, magnetic article surveillance marker having a persistent state
02/13/1991CN1049255A 电磁扫描系统 Electromagnetic scanning system
02/12/1991US4992741 Capacitive sensor and metal detector with a display for quantitatively displaying signals resulting from concealed objects
02/07/1991DE3924566A1 Arrangement for separating metal particles from granular bulk material - has deflector sealing delivery channel to pass flow to collector when metal is detected
02/05/1991US4991095 Process for three-dimensional mathematical modeling of underground geologic volumes
02/05/1991US4990925 Interferometric radiometer
02/05/1991US4990853 Logging probe
02/05/1991US4990852 Automatic classifier for electric wire detector
02/05/1991US4990850 Ferromagnetic
01/1991
01/31/1991DE3923838A1 Sensor identifying pipe cleaning scrapers - has active part with amplifier, generator, communications coil and passive part contg. LC resonator
01/30/1991EP0410245A2 Multi-Mode Electronic article Surveillance System
01/23/1991EP0140955B1 Baggage inspection apparatus and method for determining the presence of explosives
01/23/1991CN1011353B Apparatus for microinductive investigation of earth formations
01/23/1991CN1011352B Tracking helium (he4) optical pump megnetic instrument
01/23/1991CN1011351B Process for detection and analysis of anomalies within geological for motions
01/23/1991CN1011324B Well logging apparatus using uatural current and circular natural potential
01/22/1991US4987368 Nuclear magnetism logging tool using high-temperature superconducting squid detectors
01/22/1991CA1279387C Method and apparatus for detecting metal objects
01/15/1991CA1279112C Marking tape with wire conductors and methods for use
01/10/1991DE3922303A1 Magnetometer for locating magnetic objects in ground - has measurement value memory, display for valves of one or more measurement paths
01/08/1991US4983281 Metal detector scoop sifter
01/08/1991CA1278826C Method and apparatus for measuring resistivity of geologic formations
12/1990
12/27/1990EP0404549A2 Material detection
12/27/1990EP0404065A1 Sensor having an oscillation circuit
12/27/1990EP0403788A2 Sensor coil arrangement
12/27/1990EP0403632A1 Electronic article surveillance system with improved differentiation
12/27/1990CA1278342C Methods and apparatus for measurement of electronic properties of geological formations through borehole casing
12/25/1990US4980670 Deactivatable E.A.S. marker having a step change in magnetic flux
12/25/1990US4980644 Earthquake detecting magnetometer with movable magnetic compass needle and method of using same
12/25/1990US4980643 Induction logging and apparatus utilizing skew signal measurements in dipping beds
12/25/1990US4980642 Detection of influx of fluids invading a borehole
12/18/1990US4977645 Apparatus for removing foreign metal bodies from a fiber transporting duct
12/18/1990CA1278065C Inductance divider sensor
12/18/1990CA1277852C Method and apparatus for detecting metals
12/09/1990WO1990015347A1 Method and device for locating branches in drains
12/09/1990CA2033977A1 Method and device for locating branches in drains
12/05/1990EP0401136A1 Detection circuit and method for temperature-compensating of the oscillation of a resonating circuit
12/04/1990US4975646 Detector system for recognizing a magnetic material
12/04/1990CA1277226C Method and apparatus for distinguishing dispersed and laminated clay in earth formations
11/1990
11/29/1990WO1990014604A1 Proximity sensor
11/29/1990WO1990014603A1 Process and device for determining the dynamic profile of an object
11/29/1990DE3916856A1 Locating equipment preventing drilling of concealed metal parts - has circuit detecting low current in lines to drill and metal part and activating current cut=off
11/28/1990EP0399824A2 An electrical liquid level sensor for an internal combustion engine
11/28/1990EP0399563A2 High frequency oscillation type proximity switch
11/28/1990EP0399536A1 Medical instrument location means
11/28/1990EP0399026A1 Instrument for measuring reinforcing bars
11/27/1990USRE33458 Method for constructing vertical images of anomalies in geological formations
11/27/1990US4972593 Method and apparatus for measuring the undistorted magnetic field of the earth
11/27/1990CA1277027C Antenna structure for use with a transmitter located at a great depth
11/27/1990CA1277001C Proximity sensing device
11/22/1990EP0398800A1 Particle sensor with electric detection
11/22/1990EP0398728A2 Ceramic resonance type electrostatic sensor apparatus
11/22/1990EP0397655A1 Apparatus and method for electrically prospecting the subsoil.
11/22/1990DE3916500A1 Verfahren zur ermittlung des bewegungsablaufes eines gegenstandes, insbesondere eines gegenstandes in einem raum Method for determining the sequence of motion of an object, in particular of an object in a space
11/21/1990CN1047062A Steel rope broken wire test device with high sensitive magnetic sensor
11/20/1990US4972150 Plural coil induction device and method for determining in a borehole the azimuth and slope of a discontinuity layer in a homogeneous environment
11/20/1990US4972149 Electromagnetic propagation thin bed resistivity well logging system and method
11/20/1990US4972146 Saturble core device with DC component elimination for measuring an external magnetic field
11/13/1990US4970463 Temperature stable proximity sensor with sensing of flux emanating from the lateral surface of a magnet
11/13/1990CA1276233C Method and apparatus for locating leaks in a multiple layer geomembrane
11/08/1990DE4000018A1 Sensor system with combined transmitting and receiving coils - compensates prim. signal of transmitter for EM sounding by switching receiving coil compensation coil
11/06/1990US4968953 Oscillation circuit for proximity switch
11/06/1990US4968940 Well logging apparatus and method using two spaced apart transmitters with two receivers located between the transmitters
10/1990
10/30/1990US4967199 Ground probing radar method and apparatus
10/30/1990US4967185 Multi-directionally responsive, dual-status, magnetic article surveillance marker having continuous keeper
10/30/1990CA1275696C Dipmeter processing technique
10/24/1990EP0393774A1 Circuit and data transmission device containing such activation
10/24/1990EP0393387A2 Coil arrangement for an inductive detection apparatus
10/24/1990EP0393359A2 Inductive proximity switch
10/24/1990EP0393300A1 A device for processing an electromagnetic wave
10/23/1990US4965522 Multifrequency signal transmitter with attenuation of selected harmonies for an array induction well logging apparatus
10/23/1990CA1275465C Method of checking the loading and unloading of tankers by means ofan electromagnetic identification system, and an identification system for use in said method
10/23/1990CA1275442C Well logging apparatus and method
10/18/1990WO1990012316A1 Product monitoring
10/10/1990EP0332652A4 Method and apparatus for locating leaks in a multiple layer geomembrane
10/03/1990CN1045866A Composite well logging of complete gradient
10/02/1990US4961143 Method of predicting volcanic eruptions
09/1990
09/30/1990WO1990011199A1 Vehicle with plastic suspension
09/26/1990EP0366719A4 Extended range, pulsed induction logging tool and method of use
09/26/1990CN2062844U High-resolution electronic gold detector
09/25/1990US4959636 Search head for metal detectors