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| Number | Title | Issue Date |
| 7884612 | Multi-component field sources for subsea exploration A multi-component field source for surveying subsea formations includes at least two electrodes having a direction of motion, wherein the at least two electrodes are configured to produce an electric dipole in an orientation that is not parallel to both the directio... | 02/08/2011 |
| 7562633 | Ocean-going vessels Ocean-going vessels having a load carrying module supported from a pair of spaced apart hulls by legs. The legs may be articulated in two places to provide control of the spacing of the two hulls and to control the elevation of the module off the water. Dynamic cont... | 07/21/2009 |
| 7471089 | Electrode array for marine electric and magnetic field measurements having first and second sets of electrodes connected to respective first and second cables An electrode array for electric and magnetic measurements in a marine environment includes a first set of electrodes connected to a first cable, wherein the first set of electrodes and the first cable are configured to sink to a sea floor in the marine environment; ... | 12/30/2008 |
| 7295013 | Remotely operable measurement system and method employing same A marine measurement system is disclosed for obtaining measurements in an underwater operating environment. The system includes a base structure having a top surface, a bottom surface, and cavities provided therebetween. The cavities are also open to the top surface... | 11/13/2007 |
| 7030617 | System, apparatus, and method for conducting electromagnetic induction surveys A method is provided for conducting an electromagnetic induction survey of a geological formation penetrated by a borehole lined with a conductive casing. The method includes positioning a transmitter in the borehole, whereby the transmitter generates a transmitter ... | 04/18/2006 |
| 6874439 | Flexible ocean-going vessels with surface conforming hulls The vessel has a pair of flexible hulls flexibly coupled to a “cabin” between and above the hulls, thereby allowing the hulls to independently follow the surface of the water. Motor pods are hinged to the back of the hulls to maintain the propulsion system in th... | 04/05/2005 |
| 6842006 | Marine electromagnetic measurement system A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations including a central structure and arms attached to the central structure so that they can pivot relative to the central structure. An electrode is attached to th... | 01/11/2005 |
| 6791331 | Method and apparatus for measuring characteristics of geological formations An electromagnetic tomography system for determining properties of geological formation penetrated by at least one borehole lined with a conductive tubular includes a transmitter disposed in a first borehole and adapted to induce a magnetic field, a first receiver d... | 09/14/2004 |
| 6703838 | Method and apparatus for measuring characteristics of geological formations An electromagnetic tomography system for determining properties of geological formation penetrated by at least one borehole lined with a conductive tubular includes a transmitter disposed in a first borehole and adapted to induce a magnetic field, a first... | 03/09/2004 |
| 6597178 | Sensor for detecting the magnetic field in the area of downhole casing A magnetic receiver with a magnetically permeable core is positioned inside a wellbore casing and operated in a feedback mode to reduce attenuation of a measurable magnetic field. The receiver employs a feedback device to reduce mutual coupling between th... | 07/22/2003 |
| 6577284 | Component field antenna for induction borehole logging An antenna, and method for forming the same, is provided that receives or transmits three (3) components of low frequency magnetic fields while having physical dimensions that can be easily housed inside a slim borehole tool. The antenna includes a permea... | 06/10/2003 |
| 5130655 | Multiple-coil magnetic field sensor with series-connected main coils and parallel-connected feedback coils A borehole magnetic sensor includes a plurality of primary detector coils, aligned along parallel axes, and connected in series with each other. A corresponding plurality of feedback coils, each associated with a respective detector coil, are arranged to ... | 07/14/1992 |
| 4757737 | Whistle synthesizer A whistle synthesizer comprises a microphone, a housing, system electronics within the housing, and controls outside the housing. The player whistles into the microphone, the signals from which are processed to provide an instrument output signal suitable... | 07/19/1988 |
