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