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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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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 |
| 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 |
| 7194816 | Mobile terminal apparatus A mobile terminal apparatus 1 uses an acceleration sensor as a tilt angle sensor 24, and realizes various applications based on this detection result. A processing unit 10 counts the number of steps of a human based on acceleration components of... | 03/27/2007 |
| 7127333 | Remote control system for a vehicle Method and arrangement for providing a remote control system for a vehicle (1) including a primary heading sensor (14) fixedly attached to the vehicle (1). The primary heading sensor (14) is adapted to detect a reference heading (N). A re... | 10/24/2006 |
| 7122980 | Motor driving apparatus and motor driving method A motor driving apparatus includes a comparator, a threshold controller, a position determining unit, a phase-switching controller, and a current output unit. While the rotor is stopped, the phase-switching controller supplies a predetermined phase of winding with a... | 10/17/2006 |
| 6962001 | Magnetic north detecting device and magnetic north detecting method The magnetic north detecting device comprises: a 3-dimensional geomagnetism sensor unit including three geomagnetism sensors for detecting respective components of a geomagnetism magnetic field intensity in respective directions of three coordinate axes perpendicula... | 11/08/2005 |
| 6826843 | Electronic compass apparatus and method An apparatus and method for determining the orientation of Earth's magnetic poles. A magnet is pivotally coupled to a support and is free to orient itself with Earth's magnetic pole. A detector is fixed relative to the support and outputs a signal indicative of the ... | 12/07/2004 |
| 6742270 | Luminescent indication compass A luminescent indication compass includes an electric power supply, a luminescent driver, a luminescent panel, a control panel, a voltage dropping circuit, and an electronic compass module. The electronic compass module may detect the signals of orientation and proc... | 06/01/2004 |
| 6070333 | Electronic compass An electronic compass has a compass housing. An electronic magnetic field sensor is disposed in a fixed position relative to the compass housing. A magnet is rotatably mounted relative to the magnetic field sensor and independently aligned with a terrestr... | 06/06/2000 |
| 6018302 | Mechanical pointer drive for avionics display An avionics display (10) for use in an aircraft navigation system including a navigation receiver. The avionics display (10) includes a needle (12) for indicating the position, heading, glide slope or other navigational parameter of the aircraft and a ste... | 01/25/2000 |
| 5764055 | Magnetism sensor using a magnetism detecting device of a magnetic impedance effect type and control apparatus using the same An alternating bias current is made to flow through a coil wound around an MI device incorporated in an oscillation circuit, and an alternating-current bias magnetic field is applied to the MI device. An amplitude-modulated waveform corresponding to peaks... | 06/09/1998 |
| 5560115 | Gimbaled magnetometer with inductive coupling An apparatus for mounting a magnetometer including a frame and a platform mounted for rotation within the frame. The magnetometer and one or more counterweights are mounted within the platform such that gravity acting on the counterweights maintains the m... | 10/01/1996 |
| 5477470 | Real-time digital orientation device A real time directional orientation apparatus is disclosed for use in a two pi (2π) geometry. The apparatus is to be affixed to an object which translates in space. A cylindrical disk is suspended in a fluid in concert with a magnet. The cylindrical disk... | 12/19/1995 |
| 5282318 | Position sensor A position sensor has a ring of a material of high permeability that is floated on a liquid within a hermetically sealed toroid, so as to hold the ring in a horizontal position. Exciting coils are distributed uniformly about the ring to enclose the cross ... | 02/01/1994 |
| 4750349 | Microcomputer controlled quick ranging technique and digital filter A quick ranging technique controlled by a microcomputer, makes predetermined stepped adjustments to the charge times in a ranging circuit to bring the charge time into a required range, thusly minimizing calibration time for an electronic compass; a digit... | 06/14/1988 |
| 4546550 | Compass An electronic compass for vehicles comprising at least two magnetic sensors arranged in use to be respectively responsive to orthogonal horizontal components of a magnetic field which includes the earth's magnetic field and a spurious magnetic field which... | 10/15/1985 |
| 4539760 | Compass An electronic compass for vehicles comprising three magnetic sensors arranged in use to be respectively responsive to orthogonal components of a magnetic field which includes the earth's magnetic field and a spurious magnetic field which is associated wit... | 09/10/1985 |
| 4531298 | Apparatus and method for controlling northerly turning error in direction indicating navigational instruments A system to control the effect of northerly turning error which may occur in any direction indicating navigation instrument which includes a component responsive to the earth's magnetic field. In one form, an aircraft magnetic compass is compensated by el... | 07/30/1985 |
| 4428053 | Adaptive compass and north stabilization drive system This system accepts compass outputs from a wide variety of compass output devices such as stepper and synchro devices having different coupling ratios, supply voltages and carrier frequencies. The system then, as part of a PPI radar system, electronically... | 01/24/1984 |
| 4412387 | Digital compass having a ratiometric bearing processor A digital compass including a two-axis earth's magnetic field sensor and a earing processor computes the bearing for local display or transmission from a remote site to a local site for display and/or storage. The bearing processor portion of the digital c... | 11/01/1983 |
| 4402142 | Electronic compass for automotive vehicles An electronic compass for vehicles such as automobiles comprising a float mechanism including a permanent magnet for following the earth's magnetic field and four Hall effect sensors for detecting magnet orientation at points corresponding to the cardinal... | 09/06/1983 |
| 4398353 | Compass data converter The peaks of synchro or step data representative of compass heading are detected and the resulting logic levels are latched into a register by an enable pulse generated in response to the data itself. Three outputs from the register are fed directly to th... | 08/16/1983 |
| 4379366 | Direction finding system A direction finding system of the type finding a present direction on 4N direction divisions defined by 2N boundary levels for automotive vehicles, said system comprising a magnetic sensor circuit for generating a pair of electric signals indicating two p... | 04/12/1983 |
| 4327363 | System for transmitting heading information from a compass to several followers A synchro transmitter having a rotor driven by a compass communicates the heading information from that compass to a plurality of loads via respective synchro receivers whose rotors are energized with direct current or carry permanent magnets and whose st... | 04/27/1982 |
| 4255866 | Nonmagnetic compass A compass device for underwater use and having substantially no magnetic nature or influence utilizes three Hall effect generators in an array wherein two of the generators have their principal axes of magnetic response extending normal to one another an... | 03/17/1981 |
| 4250626 | Electronic compass Set out herein is an electronic compass suitable for public use having a conventional pin supported magnetic needle which is placed over a set of magneto diodes or Hall devices arranged in quadrature. The magneto diodes or Hall devices are thus exposed to... | 02/17/1981 |
| 4232451 | Detector for sensing the angular position of a rotatable magnet A detector to detect angular positions of a rotatable magnet, i.e., a magnetic compass, having one or more flux-sensitive components, namely Hall-elements. The detector includes a substantially flat and circular carrying body to be mounted on the top or b... | 11/11/1980 |
| 4075619 | Remote reading compass display A digital compass display readily movable to different intended mounting positions and including a multidigit numerical indicator mechanically and electrically connected to an end of an electrical cable and of a small size and configuration approximating ... | 02/21/1978 |
| 4067007 | Adaptive compass drive system A radar system having an adaptive compass drive capable of operation over a wide variety of compass outputs and supply voltages and frequencies. For compass outputs in the form of multi-phased analog signals, a digital phase detector converts the signals ... | 01/03/1978 |
| 4060910 | Orientation system An orientation system adapted to be mounted within a vehicle, comprising a display including a rotational heading indicating compass card fabricated from an image retaining electronic display panel responsive to bearing data signals.... | 12/06/1977 |
| 4059064 | Marine auto pilot A marine auto pilot employing a compass with a Hall-effect sensing element in conjunction with a magnetic circuit designed to provide a high intensity magnetic field; electrical circuitry designed to produce high servo-loop gain at frequencies lower than ... | 11/22/1977 |
| 4053829 | Apparatus for detecting the direction of a magnetic field to sense the position of, for example, a rotary element or the like Apparatus for detecting the direction of a magnetic field includes a magnetoresistive device comprising an insulating substrate, first and second ferromagnetic metal film strips on the substrate for providing first and second main current conducting paths... | 10/11/1977 |
| 4047168 | Digital compass and gimbal assembly for two conductor connection A remote reading magnetic compass operative with only two electrical connections for both power and data purposes. The compass includes a disc which is photoelectrically sensed to provide output signals representative of compass heading and is supported b... | 09/06/1977 |
| 3959889 | Method and apparatus for determining a measured direction relative to an external magnetic direction An apparatus is disclosed for determining a measured direction such as the direction of a ship or airplane relative to an external magnetic field such as the magnetic field of the earth. This apparatus comprises means for establishing a magnetic field rot... | 06/01/1976 |
| 3935645 | Apparatus for indicating relative azimuth An arrangement for indicating a relative azimuth between two objects remote from each other, such as a control station and a mobile unit remotely controlled by the station, on which are respectively mounted first and second synchronous transmitters for ge... | 02/03/1976 |
