Railway crossing collision avoidance system
Patent 5699986 Issued on December 23, 1997. Estimated Expiration Date: 
July 15, 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.
July 15, 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 3777139 3929307 Highway crossing system with improved ring sustain feature Process and device for transmitting data between vehicles moving over a track Railroad grade crossing motorist warning system Alarm system Wireless train proximity alert system Patent #: 5554982 InventorAssigneeApplicationNo. 679902 filed on 07/15/1996US Classes:246/125, ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES246/122R, TRAIN-POSITION INDICATION246/126, Car-actuated controller246/473.1, Highway crossing340/902, Transmitter in another vehicle (e.g., emergency vehicle)340/903, Relative distence between vehicles (e.g., collision alert)340/904Transmitter in one vehicle onlyExaminersPrimary: Morano, S. JosephAttorney, Agent or FirmInternational ClassB61L 029/00AbstractWith the vehicle anti-collision system of the present invention, road vehicles in the vicinity of a railway crossing are alerted as a train approaches the crossing. A signalling device operating in conjunction with a GPS receiver located in the train emits a signal to a receiver located at the railway crossing to provide an indication of the rail vehicle's location with respect to the railway crossing. The signal is sent continuously at predetermined intervals to provide the railway crossing with sufficient data to estimate the velocity and time of arrival of the train or railway vehicle at the crossing. The railway crossing processes the information and transmits an alarm signal to approaching road vehicles as the rail vehicle approaches the crossing. The signal emitted by the crossing is received at the road vehicle which provides various levels of alarms depending on how close the rail vehicle is to the crossing.Field of SearchTRAIN-POSITION INDICATIONCar-actuated controller ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES Highway or station, automatic Switch signals Highway crossing Highway crossing EXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARM Transmitter in another vehicle (e.g., emergency vehicle) Relative distence between vehicles (e.g., collision alert) Transmitter in one vehicle only | |
