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| Number | Title | Issue Date |
| 7356966 | Railroad grade crossing assembly An articulate railroad grade crossing assembly. In a preferred embodiment, the crossing assembly has an adjustable reach so that it can be adjusted to completely or partially close roadways of various sizes. In another preferred embodiment, the assembly includes one... | 04/15/2008 |
| 7245232 | Emergency vehicle alert system The emergency vehicle alert system may be used for detection of selected sound frequency signals emitted by warning devices of vehicles. A sensor may sense a selected sound frequency signal spectrum and may be in communication with multiple operational amplifiers. T... | 07/17/2007 |
| 7195211 | Electronically controlled grade crossing gate system and method An electronically controlled grade crossing gate system and method. The system includes a gate arm, a gate arm moving assembly, a position sensor assembly and a controller. The gate arm moving assembly is configured to move the gate arm and the position sensor assem... | 03/27/2007 |
| 6933858 | System and method for detecting obstacles within the area of a railroad grade crossing using a phase modulated microwave signal A system and method for automatically detecting the presence of an obstacle located within a surveillance area associated with a railroad grade crossing. The system includes a transmitter transmitting a signal through the surveillance area and a modulating reflector... | 08/23/2005 |
| 6471162 | Railroad maintenance-of-way personnel warning system apparatus and method therefor A railroad maintenance-of-way personnel warning system and method therefor provides advanced detecting and warning of oncoming trains encroaching the construction area. Magnetometer sensors detect an oncoming train whereby a warning signal is transmitted ... | 10/29/2002 |
| 6457682 | Automated railroad crossing warning system An automated railroad crossing warning system includes a controller for servicing the intersection of a railroad track and a roadway with directional horns oriented in opposite directions to direct horn blasts along the roadway is disclosed. A controller ... | 10/01/2002 |
| 6416021 | Locomotive whistle controlled railroad grade crossing warning system A railroad grade crossing warning device designed to operate at un-guarded grade crossings without the need for expensive train detection sensors. The system utilizes the sound of an approaching locomotive horn or whistle to activate a warning at a grade ... | 07/09/2002 |
| 6340139 | Highway grade crossing vehicle violation detector In one embodiment, the present invention is an alarm monitor for a railroad grade crossing, the grade crossing having an island activation relay that is activated in response to an approaching train, the alarm monitor including a micropower impulse radar ... | 01/22/2002 |
| 6267332 | Railroad safety system A railroad safety system for use at an intersection of a roadway and a railroad track, that comprises a sensor for detecting a hazardous situation and a voice alarm for giving a voice command to warm drivers and pedestrians of the hazardous situation.... | 07/31/2001 |
| 6241197 | Automated rail way crossing A device for monitoring the passage of a train traveling through a rail way crossing, said device including a first and second sensors for sensing the presence of the train on a rail track when the train is in proximity to the sensors, said first and seco... | 06/05/2001 |
| 6158696 | Railroad accident prevention system with ground-retractable vehicle barrier An apparatus that prevents motorists from crossing railroad tracks, when the warning gates are down during approaching of a train consists, of a plurality of tire-piercing cogs which are retracted from the ground when the railroad crossing gate is closed.... | 12/12/2000 |
| 6157322 | Automated railroad crossing warning system An automated railroad crossing warning system includes a housing mounted at the intersection of a railroad track and a roadway with directional horns oriented in opposite directions to direct horn blasts along the roadway. A light is mounted on the housin... | 12/05/2000 |
| 5954299 | Railroad crossing traffic warning system apparatus and method therefore A railroad crossing traffic warning system for alerting a motorist approaching a railroad crossing to the presence of an oncoming train. The system comprises a series of magnetometer sensor probes buried in the right-of way adjacent to a railroad track at... | 09/21/1999 |
| 5924651 | Tactile and audible warning system for railroad workers A train warning system and method for warning personnel in proximity to railroad tracks of an approaching train includes a train sensor operable with the railroad tracks for detecting passage of a train over the railroad tracks at a given location. The tr... | 07/20/1999 |
| 5735492 | Railroad crossing traffic warning system apparatus and method therefore A railroad crossing traffic warning system for alerting a motorist approaching a railroad crossing to the presence of an oncoming train. The system comprises a series of magnetometer sensor probes buried in the right-of way adjacent to a railroad track at... | 04/07/1998 |
| 4613103 | Crossing bell and flasher A model railroad crossing bell and flasher employs spaced photocell detectors along the model railroad track. A comparator receives the photocell detector output signals and upon detecting a train shadow provides power to a first oscillator which actuates... | 09/23/1986 |
