Train proximity detector
February 12, 2016. 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 1978286 3735342 3760349 Emergency radio frequency warning device Railway anticollision apparatus and method System for providing a warning when vehicles approach a common collision point Railroad grade crossing motorist warning system Computing the length of a railway vehicle or a train of such vehicles Emergency vehicle detection device Passive aircraft proximity detector for use in highway vehicles InventorsAssigneeApplicationNo. 600351 filed on 02/12/1996US Classes:340/933, VEHICLE DETECTORS340/901, EXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARM340/903Relative distence between vehicles (e.g., collision alert)ExaminersPrimary: Hofsass, JefferyAssistant: Tweel, John Jr. Attorney, Agent or FirmInternational ClassG08G 001/01AbstractDisclosed is a train proximity detector for detecting an RF carrier transmitted by a train, for a predefined period of time. Further, the encoded FSK data is decoded to determine if a match with a predefined data signature exists. If a match exists, visual and audio indications are provided to the operator, indicating a close proximity of a train. Modifications to train equipment can be made to cause the transmission of the carrier and FSK data on the activation of the train whistle, which is about 1500 feet from every crossing.Other References
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