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| Number | Title | Issue Date |
| 7348781 | Apparatus for electromagnetic logging of a formation A tool for electromagnetic logging of a formation includes a tool body configured to move in a borehole penetrating the formation; an antenna array disposed on the tool body; and an electronic unit configured to control operation of the antenna array, wherein the an... | 03/25/2008 |
| 7227466 | Expendable metal detector An expendable metal detector system for facilitating the detection of improved explosive devices (IED) where the metal detector is launched toward the suspected IED and using either magnetic field sensors in a passive mode to detect magnetic anomalies or current pul... | 06/05/2007 |
| 7038445 | Method, system and apparatus for ferromagnetic wall monitoring A device and method is taught for detection of flaws and localized wall loss in pipes made of ferromagnetic-based material. The device utilizes a magnetic field generator to create a horizontal magnetic field of flux. A pipe is passed through the magnetic field wher... | 05/02/2006 |
| 7031839 | Multi-frequency focusing for MWD resistivity tools An induction logging tool is used on a MWD bottom hole assembly. Due to the finite, nonzero, conductivity of the mandrel, conventional multi frequency focusing (MFF) does not work. A correction is made to the induction logging data to give measurements simulating a ... | 04/18/2006 |
| 6979972 | Method and apparatus for detecting a stalled stepper motor A method for detecting a state of an electric motor includes: energizing the motor with electrical power such that an associated current applied to the electric motor rises over time toward a reference level; determining an amount of time that elapses between when t... | 12/27/2005 |
| 6967415 | Power source apparatus A power source apparatus comprising: a direct current power source to output a first voltage; a load driven with a second voltage higher than the first voltage; a booster converter to boost an output from the direct current power source to the second voltage; and a ... | 11/22/2005 |
| 6966184 | Photovoltaic power generating apparatus, method of producing same and photovoltaic power generating system A photovoltaic power generating apparatus is provided which comprises a single solar cell element formed on a substrate and a plurality of power conversion devices individually connected to the solar cell element for converting an output of the solar cell element. | 11/22/2005 |
| 6967520 | Gate drive circuit, which makes the gate-charge flow back to the load and the main power source A gate driving circuit having: a direct current power source; a driving signal source for outputting signal; a main switch device, having a gate terminal in which the signal outputted from the driving signal source is inputted, for controlling a conduction state bet... | 11/22/2005 |
| 6965237 | Device for scanning or detecting electromagnetic waves A detecting device for detecting electromagnetic waves generated by electric facilities includes a support having a peripheral surface for attaching a number of wave detectors which detect the electromagnetic waves generated by the electric facilities. The support m... | 11/15/2005 |
| 6905241 | Determination of virgin formation temperature A method for determining virgin formation temperature of earth formations surrounding a borehole is provided. The time duration of drilling fluid circulation and the time after cessation of drilling fluid circulation at the borehole depth regions of interest are tra... | 06/14/2005 |
| 6891376 | Method for attenuating conductive sonde mandrel effects in an electromagnetic induction well logging apparatus An electromagnetic induction logging method is disclosed. The method includes measuring electromagnetic induction response in earth formations surrounding a wellbore. The measuring is performed on an electrically conductive sonde support. The measured response is de... | 05/10/2005 |
| 6714153 | Device for electromagnetic detection of geological properties in a well The invention is a well radar for detecting, by electromagnetic wave reflection, resistivity horizons in production zones in oil wells. Transmitter and receiver antennas are combined in a tubing string antenna module. Two dipole transmitter antenna are positioned in... | 03/30/2004 |
| 6690320 | Time domain reflectometry measurement instrument A time domain reflectometry measuring instrument uses a microprocessor that provides added functionality and capabilities. The circuit electronics and probe are tested and calibrated at the factory. Installation and commissioning by the user is simple. Th... | 02/10/2004 |
| 6657577 | Radar plant and measurement technique for determination of the orientation and the depth of buried objects A plant for generation of information indicative of the depth and the orientation of an object positioned below the surface of the ground is adapted to use electromagnetic radiation emitted from and received by an antenna system associated with the plant.... | 12/02/2003 |
| 6633252 | Radar plow drillstring steering A radar-plow drillstring steering system comprises a steering plow and a measurements-while-drilling instrument for mounting just behind the drill bit and downhole motor of a drill rod. The instrument includes a radar system connected to upward-looking an... | 10/14/2003 |
| 6396433 | Talking buried object detector A spoken word-producing detector identifies objects by comparing signatures of detected objects with stored signatures of known objects. When the signatures compare, the detector produces stored word sounds associated with the detected object identificati... | 05/28/2002 |
| 6229476 | Liquid level meter A liquid level meter is provided for measuring a level of a liquid (1) in a container (3), which meter measures acceptably in the case of liquids with low dielectric constants, and the installation and maintenance of which are simple and cost effective. T... | 05/08/2001 |
| 6211807 | System using spread spectrum modulation for locating underground objects The location of underground objects such as pipes and conduits are located by detecting electrical signals emitted by the underground objects where the radiated signals include spread spectrum modulated RF signals. The system can operate in a passive or a... | 04/03/2001 |
| 6196703 | Automatic shutoff system A control system is provided for use in conjunction with a lighting fixture which will provide additional safety by avoiding the risk of fire. The safety system provides a number of sensors which are capable of detecting the presence of objects in close p... | 03/06/2001 |
| 5769503 | Method and apparatus for a rotating cutting drum or arm mounted with paired opposite circular polarity antennas and resonant microstrip patch transceiver for measuring coal, trona and potash layers forward, side and around a continuous mining machine For use in explosive atmospheres during mining, an flame proof or explosion proof internal AC alternator is provided to source electrical power from the rotations of a cutting head. A synthetic-pulse stepped-frequency ground-penetrating radar is used with... | 06/23/1998 |
| 5699246 | Method to estimate a corrected response of a measurement apparatus relative to a set of known responses and observed measurements The present invention provides a new method to determine corrected characteristics of materials using the measured quantities obtained by a measurement and an extensive set of database points representing laboratory and modeled results in well defined env... | 12/16/1997 |
| 5650726 | Emitter for an electromagnetic tomography measurement system which connects a greater number of windings to a magnetic core at low frequencies than at high frequencies aN emitter for a system of electromagnetic tomographic measurement, as well as a process and a generator (5) adapted to produce a variable frequency current supplying a solenoid (1), constituted of turns wound about a magnetic core (3). The solenoid (1) i... | 07/22/1997 |
| 5442293 | Method and apparatus for determining fluid content and conductivity in porous materials A method and apparatus for determining the water content and its conductivity in porous media such as soils. The apparatus uses radio frequency electromagnetic fields to sample the environment of a sensor probe. One configuration uses an active oscillator... | 08/15/1995 |
| 5243290 | Apparatus and method of logging using slot antenna having two nonparallel elements A slot antenna has a square aperture and two current probes at angles to each other in the aperture. The two current probes are excited simultaneously or separately with different signals. By adjusting the amplitude or phase of the signals in the current ... | 09/07/1993 |
| 5188426 | Method for controlling the thickness of a layer of material in a seam A method for determining the thickness of a layer of material, such as soil, wood, ice or coal, that utilizes a microstrip antenna as a thickness measuring sensor. The sensor is positioned over the layer and a value for a parameter of the antenna such as ... | 02/23/1993 |
| 5072172 | Method and apparatus for measuring the thickness of a layer of geologic material using a microstrip antenna A method of determining the thickness of a layer of material, such as soil, wood, ice or coal, that utilizes a microstrip antenna as a thickness measuring sensor. The sensor is positioned over the layer and a value for a parameter of the antenna such as c... | 12/10/1991 |
| 4013950 | Apparatus for measuring the electromagnetic impedance of soils Apparatus for measuring the electromagnetic (E/M) impedance of soil is diosed. This impedance is obtained by measuring the voltage standing wave ratio and first minimum with the disclosed apparatus. The apparatus comprises a trombone slotted line in comb... | 03/22/1977 |
