Wireless railroad grade crossing warning system
Patent 5864304 Issued on January 26, 1999. Estimated Expiration Date: 
August 8, 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.
August 8, 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 1882265 2137719 3758775 3888437 Magnetic detector for an unmanned vehicle control system 4887205 System for providing a warning when vehicles approach a common collision point Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment Moving vehicle identification system Wireless train proximity alert system Patent #: 5554982 InventorsAssigneeApplicationNo. 694378 filed on 08/08/1996US Classes:340/903, Relative distence between vehicles (e.g., collision alert)49/25, RADIANT ENERGY CONTROL246/122R, TRAIN-POSITION INDICATION246/125, ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES246/126, Car-actuated controller246/187B, Non-mechanical control of vehicles from wayside246/473.1, Highway crossing246/473.2, Wigwag type340/901, EXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARM340/905Highway information (e.g., weather, speed limits, etc.)ExaminersPrimary: Hofsass, JefferyAssistant: Tweel, John Jr. International ClassG08G 001/16AbstractA railroad-crossing warning system for protecting pedestrians and motorists from an oncoming train. The warning system has a vehicle detector system for determining whether a vehicle is stuck in an area of the railroad crossing, a train detector system for determining vital train information including the speed and direction of the oncoming train, a display unit for displaying warning messages to the pedestrians and motorists approaching the railroad crossing, and a communication system for communicating the vital train information and the distressed vehicle information to the oncoming train and the display system. The system provides early warning to the operator of the oncoming train to provide more reliable protection for distressed vehicles in the railroad crossing and for motorists and pedestrians approaching the railroad crossing.Field of SearchRelative distence between vehicles (e.g., collision alert)TRAFFIC CONTROL INDICATOR Transmitter in another vehicle (e.g., emergency vehicle) Highway information (e.g., weather, speed limits, etc.) EXTERNAL CONDITION VEHICLE-MOUNTED INDICATOR OR ALARM At remote location Vehicle's arrival or expected arrival at remote location along route indicated at that remote location (e.g., bus arrival systems) RADIANT ENERGY CONTROL WITH TRAFFIC DIRECTOR OR CONTROLLER; E.G., ONE-WAY Highway crossing Wigwag type Light beam projecting TRAIN-POSITION INDICATION Non-mechanical control of vehicles from wayside Highway crossing ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES Car-actuated controller Gates and doors Selective Train telegraphy or telephony | |
