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 |
| 7353614 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One suc... | 04/08/2008 |
| 7331115 | Vehicle compass compensation A compass compensation system is provided for automatically and continuously calibrating an electronic compass for a vehicle, without requiring an initial manual calibration or preset of the vehicle magnetic signature. The system initially adjusts a two axis sensor ... | 02/19/2008 |
| 7325320 | Method for estimating the accuracy of azimuthal orientations and portable sighting device In a method according to the invention for estimating the accuracy of azimuthal orientations (a) of a measuring device (1) having an electronic magnetic compass (2), a plurality of determinations of an azimuthal orientation (a, a′, a″, a′″, aâ€... | 02/05/2008 |
| 7266902 | Method and device for fastening a sensor A method and device for securing a sensor, a stereo camera in motor vehicles in particular, in which accurate alignment of the sensor holding element is achieved during assembly using an adjusting gauge having the dimensions of the sensor and optionally pins which a... | 09/11/2007 |
| 7249419 | Portable terminal apparatus with auto caliblation of orientation measurement A portable terminal apparatus is mounted in a casing and has a magnetic sensor that detects a magnetic field around the casing with an offset and outputs magnetic data representing the detected magnetic field, and a tilt sensor that detects a tilt of the casing and ... | 07/31/2007 |
| 7248983 | Electronic compass and method of controlling an electronic compass using independent calibration and compass heading modules A method for controlling an electronic compass includes receiving raw magnetic field data into a calibration module and determining a calibration output based upon the raw magnetic field data. The raw magnetic field data is also received into a compass heading modul... | 07/24/2007 |
| 7168176 | Geomagnetic sensor for informing users whether detected azimuth angle is acceptable, and a method thereof A geomagnetic sensor which informs a user that information with respect to a distorted azimuth angle may be detected. The geomagnetic sensor includes a geomagnetism detection module including an X axis fluxgate and a Y axis fluxgate orthogonal to each other and dete... | 01/30/2007 |
| 7031875 | Pointing systems for addressing objects Systems are arranged to provide a user information which relates to objects of interest. A user may point a hand held device toward an object to address it. The device determines which objects are being addressed by making position and attitude measurements and furt... | 04/18/2006 |
| 7020971 | Compass orientation compensation A compass system comprises an electronic compass capable of providing a raw compass reading, at least one adjustment factor relating to a position of the electronic compass, and a compensation device selectively providing a compensated compass reading based on the r... | 04/04/2006 |
| 6960912 | Magnetic field sensor device In a magnetic sensor device, a positioning element is provided with receptacles for receiving one magnetic field sensor element each. The positioning element and the magnetic field sensor elements are manufactured in a way that they fit exactly together so that the ... | 11/01/2005 |
| 6950731 | Traffic pattern approach computer A mechanical computer used in tandem with a GPS to approach, enter and fly the traffic pattern of any uncontrolled airport. Pilots must navigate to a relatively small area or approach point before entering the traffic pattern of an uncontrolled airport. While airpor... | 09/27/2005 |
| 6928366 | Electronic compass system An electronic compass system includes a magnetic sensor circuit having at least two sensing elements for sensing perpendicular components of the Earth's magnetic field vector. A processing circuit is coupled to the sensor circuit to filter, process, and compute a he... | 08/09/2005 |
| 6922902 | Vehicle compass compensation A compass compensation system is provided for automatically and continuously calibrating an electronic compass for a vehicle, without requiring an initial manual calibration or preset of the vehicle magnetic signature. The system initially adjusts a two axis sensor ... | 08/02/2005 |
| 6662459 | Electronic azimuth meter and timepiece A method for adjusting an electronic azimuth meter comprising the steps of performing a magnetic field generating sequence by generating a sequence of magnetic fields used for adjusting the electronic azimuth meter, the sequence of magnetic fields commenc... | 12/16/2003 |
| 6643941 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criter... | 11/11/2003 |
| 6606799 | Electronic azimuth meter and electronic time piece having electronic azimuth meter An electronic azimuth meter includes an electronic azimuth meter main body and X-direction and Y-direction magnetic sensors for detecting magnetic field components in orthogonal two directions of the main body, the main body includes a magnetic part magne... | 08/19/2003 |
| 6543146 | Electronic compass and compensation of large magnetic errors for operation over all orientations A three-axis algebraic model is used to numerically compensate for magnetic errors in measured magnetic field values in an electronic compass for any orientation of the compass. This model is based on physical principles and uses a linear algebra approach... | 04/08/2003 |
| 6513252 | Vehicle compass compensation A compass compensation system is provided for automatically continuously calibrating an electronic compass for a vehicle, without requiring an initial manual calibration or preset of the vehicle magnetic signature. The system initially adjusts a two axis ... | 02/04/2003 |
| 6466871 | Method for calibrating and verifying the attitude of a compass A method for calibrating the attitude of a compass in relation to the platform on which the compass is installed. The compass includes an attitude determining device and an optical sighting device and the compass is integrally mounted on a platform. The m... | 10/15/2002 |
| 6356851 | Accelerated calibration for electronic compass module A system for calibrating an electronic compass for a vehicle of the type employing a Forward and Lateral magnetoresistive magnetic field sensor. As the vehicle changes headings, the system periodically samples and digitally stores the peaks of the sensor ... | 03/12/2002 |
| 6301794 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criter... | 10/16/2001 |
| 6286222 | System for eliminating magnetic noise generated by vehicle accessories An electronic compass system for eliminating magnetic noise which is integrated with an instrument cluster. A vehicle accessory, such as a stepper motor, also located in the instrument cluster, generates a known, consistent, magnetic field of intensity su... | 09/11/2001 |
| 6286221 | System using magnetic signatures to detect a vehicle event An electronic compass system using magnetic signatures to detect a vehicle event which is integrated with an instrument cluster. A vehicle accessory, such as a rear defrost grid, generates a known, consistent, magnetic field of intensity sufficient to cau... | 09/11/2001 |
| 6243649 | GPS true course guidance correction system for correcting antenna offset error A method for correcting yaw in a DGPS (global positioning system) based guidance system mounted on a vehicle. The method corrects for a yaw induced heading/cross track error due to a DGPS antenna being mounted a significant distance from the point of oper... | 06/05/2001 |
| 6049761 | Vehicular traveling direction measuring system A vehicular traveling direction measuring system derives a weighting constant based on a monitored magnitude of the geomagnetic disturbance around a vehicle. Variance values of geomagnetism indicative data and a deviation magnitude from a standard azimuth... | 04/11/2000 |
| 6014610 | Navigation system and method An electronic compass system and method in which an automatic calibration process is available while the vehicle is in use. The procedure uses a binning process to collect and count data points which automatically triggers the automatic calibration proces... | 01/11/2000 |
| 6009629 | Process for determining the direction of the earth's magnetic field A method for determining the direction of the Earth's magnetic field, which may be interfered with by magnetic materials built into equipment and by electric currents, using an electronic magnetic compass which contains three magnetic field sensors and tw... | 01/04/2000 |
| 5946813 | Method and device for determining correction parameters The invention relates to a method for determining correction parameters for the measured values of a magnetic compass, which is built into a land craft for navigation purposes, and gives the azimuth a of the direction of motion of the vehicle; of a gradio... | 09/07/1999 |
| 5828984 | Data processing method for an electronic compass system A method for converting distorted compass data values into corrected data values which employs linear transforms. A linear transform is formulated and programmed into the read only memory of the microcomputer of the electronic compass system. The microcom... | 10/27/1998 |
| 5481808 | Vehicle orientation sensor and method with magnetic stabilization A device for determining the orientation of a vehicle includes a magnetic field sensor (3) which is arranged in the vicinity of a ferromagnetic outer wall of the body of the vehicle and which is rigidly connected to the wall. External magnetic fields coul... | 01/09/1996 |
| 5440303 | Direction detecting apparatus and method thereof In a direction detecting apparatus for a vehicle, when signals input from an earth magnetic sensor into calculating means are judged to be outside a predetermined judging area, an alarm for prompting magnetization correction is given, thereby the directio... | 08/08/1995 |
| 5349529 | Method of correcting magnetization vector When the body of an automobile equipped with a stand-alone navigation system is magnetized by an external magnetism, an unknown magnetization vector is determined by correcting the known magnetization vector. Even very small changes in the magnetization v... | 09/20/1994 |
| 5287295 | Method and apparatus for calibrating an electronic compass to account for alignment errors in the compass windings An electronic compass (10) having at least two sense windings (11, 12) is mounted in a vehicle. The outputs (x(h), y(h)) of the windings are measured for a number of compass directions (headings). From this data an error difference angle ($c;), from a ... | 02/15/1994 |
| 5201128 | Miniature gimbal mounted magnetic field detectors A miniaturized electronic magnetic compass system, or the like, is mounted in a substantially cylindrical gimbal ring unit of about 0.75 in diameter, and 1.25 in length. Critical to the small size is the pendulum that positions the internal magnetic detec... | 04/13/1993 |
| 5131155 | Apparatus and method for measuring forward direction of vehicle An apparatus and method for measuring a forward direction of a vehicle in which to derive a coordinate position of a center (Ox, Oy) of a directional circle derived from an output of a geomagnetic direction sensor after a magnetizati... | 07/21/1992 |
| 5021962 | Navigation method for vehicles with electronic compass A method for determining the north direction or the travel direction of a vehicle having an electronic compass is proposed by means of which field disturbances at the magnetometer of the compass, occurring during the navigation drive, are measured and eva... | 06/04/1991 |
| 4989333 | Navigation method for vehicles with electronic compass A method for determining the direction of the earth field, the north direction and the travelling direction of a vehicle by way of a magnetometer mounted in the vehicle is based on dynamic compensation or updating of interfering field changes. For this pu... | 02/05/1991 |
| 4870602 | Method for determining route angles A method for the determining route angle and for automatically calibrating course accuracy with a three-axis magnetometer fixed to an aircraft despite the presence of interfering vehicle magnetic fields and instrumentation errors. The method is accomplish... | 09/26/1989 |
| 4782453 | Method of determining the location of a navigational magnetic field sensor in a vehicle To determine the optimal location for a magnetic field sensor in a navigational system in a vehicle, the field sensor is preliminarily and releasably secured at a first location in the vehicle, and then the vehicle is rotated by 360°, for example by movi... | 11/01/1988 |
| 4672565 | Direction detecting system for vehicles A direction detecting system comprises a geomagnetic field sensor for detecting the direction of the earth magnetism by two perpendicular components and a computing circuit for computing a direction and producing a direction signal from the electrical sig... | 06/09/1987 |
