Optical location tracking devices
Patent 5393970 Issued on February 28, 1995. Estimated Expiration Date: 
September 13, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 13, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3268185 Solar tracking apparatus Cordless digital graphics input device Indicator to data processing interface Ambient-light-responsive touch screen data input method and system Apparatus to digitize graphic and scenic information and to determine the position of a stylus for input into a computer or the like Wireless pen-type input device for use with a computer Patent #: 5166668 InventorsAssigneeApplicationNo. 119537 filed on 09/13/1993US Classes:250/206.2, Detection of positional information in two or more planes (e.g., azimuth and elevation; hour angle and declination)250/203.4, Sun250/203.6, Airborne target, or spaceborne target other than the sun (e.g., star or missile)250/206.1Having means to generate positional information in at least one plane of a target moving relative to one or more photodetectorsExaminersPrimary: Sikes, William L.Assistant: Abraham, Fetsum Foreign Patent References
International ClassesG01J 001/20G01S 003/784 AbstractA practical location tracking device provides cost-efficient methods for inputting three-dimensional location information. This device comprises light sources and light receiving elements. Each light receiving element comprises two or more closely spaced planar light detectors with their light receiving surfaces facing different spatial directions. Three dimensional location is determined by comparing the relative light intensities detected by those light detectors.Field of SearchSunAirborne target, or spaceborne target other than the sun (e.g., star or missile) Having means to generate positional information in at least one plane of a target moving relative to one or more photodetectors Detection of positional information in two or more planes (e.g., azimuth and elevation; hour angle and declination) | |
