Vehicle location system
Patent 5055851 Issued on October 8, 1991. Estimated Expiration Date: 
November 29, 2009. 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.
November 29, 2009. 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 ReferencesInventorApplicationNo. 443465 filed on 11/29/1989US Classes:342/457, Land vehicle location (e.g., bus, police car340/539.1, Radio340/539.13, Tracking location (e.g., GPS, etc.)380/58, Characters on peripheral surface (e.g., cylinder section)380/59, MISCELLANEOUS455/456.5At system equipment (i.e., base station)ExaminersPrimary: Tarcza, Thomas H.Assistant: Cain, David Attorney, Agent or FirmForeign Patent References
International ClassG01S 003/02AbstractA system for determining a location of a selected vehicle from which an alarm signal is generated which includes a fixed array of cellular sites each site having a wireless signal detecting and generating units each of which is capable of receiving an input alarm signal having a signal strength which is a function of the distance between the position of the vehicle generating the alarm signal and the position of each of the wireless signal detecting units. Each unit also is capable of transmitting an output signal which is a function of the strength of the input alarm signal. The system also includes a main wireless signal detecting apparatus for receiving an output signal from each of the wireless signal detecting and generating units and a control monitoring unit which is coupled to the main woreless signal detecting apparatus, for receiving output signals there from, each of the output signals being a function of the strength of the received input alarm signal, for determining the approximate location of the selected vehicle from which the alarm signal is generated. | |
