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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 |
| 7197343 | Portable electronic apparatus with azimuth measuring function, magnetic sensor suitable for the apparatus, and azimuth measuring method for the apparatus A portable phone has a CPU and a magnetic sensor unit including an X-axis magnetic sensor, a Y-axis magnetic sensor, and a temperature sensor. CPU measures at first and second temperatures the influence of a magnetic field of permanent magnets upon an output Sx of t... | 03/27/2007 |
| 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 |
| 6871412 | Alignment tool and method for aligning large machinery Apparatus and method for the alignment of large machinery, including a tool for supporting each corner of the machine during alignment. The tool during the alignment operation is substantially frictionless and is capable of limited, controlled movement to accomplish... | 03/29/2005 |
| 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 |
| 4656751 | Magnetic compass A magnetic compass comprises: a gimbal mounted direct read card supported on a bearing in the equatorial plane of the compass in a compass bowl; and a housing having a base to which the compass bowl and corrector magnets are mounted; the corrector magnets... | 04/14/1987 |
| 4058782 | Method and apparatus for compensation of interference magnetic fields Compensating magnets are located on the article being tested which are adjustable to provide a range of magnetic moments. In a first version, each compensating magnet consists of an annular permanent magnet received on a rod-like element positioned on the... | 11/15/1977 |
