Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8074515 | Gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 12/13/2011 |
| 8033170 | Gravity gradiometer The present invention provides a method of tuning properties of a gravity gradiometer for measuring components of the gravity gradient tensor. The gravity gradiometer comprises a pair of first and second transversely arranged sensor masses that are arranged for move... | 10/11/2011 |
| 8028577 | Gravity survey with relative and absolute gravimeters A gravity survey is conducted by obtaining relative gravity measurements from a plurality of survey points using a relative gravimeter, obtaining absolute gravity measurements from a subset of a lesser plurality of the survey points designated as combination survey ... | 10/04/2011 |
| 7980130 | Gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 07/19/2011 |
| 7975544 | Gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 07/12/2011 |
| 7954375 | Inclined axis gravity gradiometer Systems for and methods of detecting gravitational acceleration and gravity gradients are disclosed. The systems and methods include gravity gradiometers whose axes are substantially horizontal. In comparison with prior art systems, the systems presently disclosed p... | 06/07/2011 |
| 7942054 | Gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 05/17/2011 |
| 7938003 | Gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 05/10/2011 |
| 7849739 | Gravity gradiometer A gravity gradiometer is described which comprises a pair of sensor bars arranged in housings. Transducers are arranged adjacent the bars for measuring movement of the bars in response to the gravity gradient tensor. At least one of the transducers has a sensing coi... | 12/14/2010 |
| 7823448 | Actuatory and gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 11/02/2010 |
| 7823449 | Gravity gradiometer A gravity gradiometer and method for forming a pivot flexure web for a gradiometer is disclosed. The gradiometer has measurement bars 41, 43 supported in housings 45 and 47 and transducers 71 for measuring movement of the bars to provide ... | 11/02/2010 |
| 7814790 | Gravity gradiometer The present invention provides a method of tuning properties of a gravity gradiometer for measuring components of the gravity gradient tensor. The gravity gradiometer comprises a pair of first and second transversely arranged sensor masses that are arranged for move... | 10/19/2010 |
| 7784343 | Gravity gradiometer A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A first flexure web (33) pivot... | 08/31/2010 |
| 7637153 | Gravity gradiometer A gravity gradiometer is disclosed which comprises a pair of sensor masses arranged in housings. Transducers are provided for measuring movement of the sensor masses in response to the gravity gradient tensor. The masses are supported for movement by a flexure web b... | 12/29/2009 |
| 7365544 | Methods of adjusting airborne geophysical measurements based on mapping instrument measurements This invention concerns a method of making airborne geophysical measurements. Such measurements may be made from fixed or moving wing airplanes or dirigibles. The method comprises the following steps: taking first real time measurements from one, or more, geophysica... | 04/29/2008 |
| 7360419 | Gravity gradiometer A gravity gradiometer having quadrupole responders in which a mass quadrupole is supported by a torsional spring forming a flexure allowing rotation of the mass quadrupole about its center of mass. The flexure can be a pair of spaced apart posts. The flexure can be ... | 04/22/2008 |
| 7337668 | Accelerometer in closed loop with error detection An accelerometric measurement device with a return loop including accelerometer, a corrector generating a signal for correction of the position of the accelerometer, a closed return loop to apply this correction signal to the accelerometer, a detector to detect an e... | 03/04/2008 |
| 7305879 | Cross-component superconducting gravity gradiometer with improved linearity and sensitivity and method for gravity gradient sensing A cross-component superconducting gravity gradiometer sensitive to off-diagonal components of the gradient tensor includes, for each gradient axis, a pair of closely matched angular accelerometers coupled by superconducting circuitry, including sensing circuits desi... | 12/11/2007 |
| 7240550 | Method and apparatus for material indentification by means of gravitational field analysis Described is a sensor for filling level measurement using a gravitational field analysis, comprising a first and a second gravimeter unit. The measurement is effected in a contactless manner, via the container wall and without input of energy into the filling good. ... | 07/10/2007 |
| 7236885 | Method and system for geophysical data acquisition on an airship A geophysical survey is conducted, using specialized instruments, to measure the gravity field by flying over a terrain of interest. A series of nominally parallel survey lines can be flown until a total region to be surveyed has been covered. The geophysical survey... | 06/26/2007 |
| 7225553 | Gradiometer mounting and isolation system An apparatus for maintaining the orientation of an instrument or other object in one embodiment includes an inner shell of ferromagnetic material. An outer shell surrounds the inner shell, and one or more electromagnets are attached to the inner surface of said oute... | 06/05/2007 |
| 7181967 | Enhancement of sensors for airborne operation Gravity gradiometers (or gravity gradient instrument, GGI) measure one or more components of the gradient of gravity which is expressed as the gradient of a gravity vector. One or more feedback loops extend from the instrument output to one or more of the accelerome... | 02/27/2007 |
| 7113868 | Method and system for processing geophysical survey data A method and system for processing geophysical survey data is provided. Gravity gradiometry data is processed by approximating density values of terrain signals to remove contributions of the terrain from the gravity gradiometry data. Initially, a predicted gravity ... | 09/26/2006 |
| 7107833 | Inertial reference unit with internal backup attitude heading reference system An inertial reference unit (IRU) is described which includes a processor programmed to provide inertial data from received inertial signals, a primary sensor unit providing the inertial signals to the processor, and an input/output (I/O) unit communicatively coupled... | 09/19/2006 |
| 7091811 | Fixing member A device for absorbing axial and radial short-circuit forces in a cable-wound inductor. A fixing member includes an inner envelope surface that surrounds the cable winding of the inductor. ... | 08/15/2006 |
| 7069780 | Gravity techniques for drilling and logging Techniques for using gravity in applications such as drilling and logging. Techniques are present for (1) gravity well logging using gravity sensors arrays; (2) creating density pseudosections using gravity measurements; (3) performing Gravity Measurement While Dril... | 07/04/2006 |
| 7065449 | Method and system for evaluating geophysical survey data A method and system for evaluating geophysical survey data is provided. Two neighboring flight paths of a geophysical survey are likely to have geophysical characteristics in common because neighboring flight paths cover geographic areas in a close proximity to one ... | 06/20/2006 |
| 7047170 | Method of determining boundary interface changes in a natural resource deposit A method of determining changes in the boundary interface in a sub-surface oil reservoir between the to-be-recovered oil and a driveout fluid, such as steam, uses time-displaced gravity gradient measurements to provide an indication of the changes in the gravity gra... | 05/16/2006 |
| 7043366 | Method for enhancing depth and spatial resolution of one and two dimensional residual surfaces derived from scalar potential data An improved method is disclosed for collecting or assembling scalar potential data measurements that are to be subsequently prepared as a surface representation for analysis via frequency domain transform filters. Measurements are made over a geographic reference re... | 05/09/2006 |
| 7002341 | Superconducting quantum interference apparatus and method for high resolution imaging of samples A method and apparatus performs high resolution imaging. The disclosed apparatus includes a low temperature SQUID sensor mounted in close proximity to a dewar thin window. A radiation shield has an extension surrounding the detection coil. ... | 02/21/2006 |
| 6993433 | Modeling gravity and tensor gravity data using poisson's equation for airborne, surface and borehole applications The present invention is a method for determining a parameter of interest of a region of interest of the earth. At least one component of potential fields data is measured at a plurality of locations over a region of interest including a subterranean formation of in... | 01/31/2006 |
| 6954698 | System and method for surveying underground density distributions A method for geographical surveying includes the steps of determining an observation grid comprising observation points above a solution volume in the ground; making gravitational measurements at the observation points over a survey area; compiling a matrix having e... | 10/11/2005 |
| 6883372 | Airborne gravity gradiometers This invention concerns gravity gradiometers for airborne surveys for minerals. The gravity gradiometer comprises an inertially stabilized platform, a rotor that is between 0.4 and 1.5 m in diameter mounted in the stabilized platform, and between twelve and seventy ... | 04/26/2005 |
| 6871542 | Apparatus for the measurement of gravitational gradients An apparatus for the measurement of quasi-static gravity gradients comprising a flexible string and output means for producing an output which is a function of the gravity gradients, wherein the string is fixed at both ends, and wherein the apparatus comprises sensi... | 03/29/2005 |
| 6837106 | Gravity gradiometry A gravity gradiometer is combined with a two-stage actively controlled isolation system. The gravity gradiometer and two stage isolation system may then be mounted within (or on) a mobile vehicle such as, for example, an aircraft. It has been recognized by the inven... | 01/04/2005 |
| 6813564 | Method for monitoring seafloor subsidence and for gravity monitoring an underground hydrocarbon reservoir The invention is a method for monitoring subsidence of the sea-bed (14) of a survey area (8) caused by compaction of an underground hydrocarbon reservoir (1), and comprises the following steps: Conducting at least two series (S1, . . ... | 11/02/2004 |
| 6799459 | Gravity gradiometer and method for calculating a gravity tensor with increased accuracy A method includes measuring an acceleration along an input axis of an accelerometer mounted to a gradiometer disc, the accelerometer having a coordinate axis that is parallel to a spin axis of the disc, and includes calculating a gravity tensor element as a function... | 10/05/2004 |
| 6778918 | Methods for monitoring fluid front movements in hydrocarbon reservoirs using permanent sensors A method of monitoring a fluid front movement is provided. The method includes: determining at least two techniques for monitoring the fluid front movement; determining a configuration of monitoring sensors, corresponding to the at least two monitoring techniques, f... | 08/17/2004 |
| 6776035 | Method and device for calibration of dual-axis tilt meter The invention is directed toward a subsurface gravity measurement device and a method for calibrating the same that includes a tilt meter and a gravity sensor. The method includes associating tilt information produced by the gravity sensor as a function of a relatio... | 08/17/2004 |
| 6668646 | Gravity meter A gravity meter comprises a casing, a vacuum tube mounted in the casing in a vibration-free manner, a sensor mechanism mounted within the vacuum tube, the sensor mechanism comprising two masses of different size acting on the respective arms of a beam bal... | 12/30/2003 |
