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| Number | Title | Issue Date |
| 7439876 | Microwave detection system and method A microwave detection system includes a transmitter configured to transmit a signal along a path to detect an intruder to a monitored zone and a modulating reflector configured to receive the transmitted signal to generate a modulated signal having a characteristic ... | 10/21/2008 |
| 7429935 | Directional audio train signaling system and method A system and method for a directional audio train signaling system that comprises a receiver for receiving a signal indicating the approach of a train to a point of interest and one or more directional audio transmitter systems for transmitting a warning related to ... | 09/30/2008 |
| 7388483 | Monitoring status of railyard equipment using wireless sensing devices A wireless position sensing device is provided for monitoring railyard equipment status. The device comprises a gravity sensing mechanism for sensing an angular displacement with respect to a substantially vertical line, and for generating a displacement signal upon... | 06/17/2008 |
| 7295111 | Microwave detection system and method for detecting intrusion to an off-limits zone A system and method are provided for automatically detecting intrusion in an off-limits zone. The system includes a transmitter transmitting a signal along a path likely to encounter an intruder to the off-limits zone and a modulating reflector for receiving the tra... | 11/13/2007 |
| 7215278 | Radar frequency hopping Apparatus and methods for adjusting or “hopping” the center frequency or the pulse repetition frequency of a radar system improve the co-locatability of multiple radars commonly located in a region. In a Time Domain Downconversion (TDDC) or Ultra-Wideband (UWB) ... | 05/08/2007 |
| 7196636 | Railroad crossing warning system A highway/railroad crossing detection and warning system which uses sets of Doppler radar transmitters and receivers to detect the approach of a train coming from either direction toward a highway crossing. The Doppler radar sets are located an extended distance fro... | 03/27/2007 |
| 7095861 | Audible signaling device with determinate directional radiation An audible signaling device uses one or more digital signal processors to modify the shape of a sound field to put high sound pressure levels only in a predetermined pattern, thus minimizing undesirable high volume levels in adjacent areas. Using digital signal proc... | 08/22/2006 |
| 7088284 | Portable proximity-sensing safety device A warning device in one embodiment includes a housing which is portable, the housing containing preferably a microwave transceiver operating as a proximity-sensing device, a stroboscopic lamp and/or a horn disposed in the housing in electrical connection with the se... | 08/08/2006 |
| 6996461 | Method and system for ensuring that a train does not pass an improperly configured device A train control system includes a positioning system and consults a database to determine when the train is approaching a configurable device such as a switch or grade crossing gate. The system continuously interrogates the device to determine its status as the trai... | 02/07/2006 |
| 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 |
| 6917284 | Railroad collision avoidance system and method for preventing train accidents A railroad collision avoidance system and method are disclosed that utilize impulse radio technology to effectively warn a person when there is a locomotive in their vicinity. In one embodiment, the railroad collision avoidance system includes a transmitting impulse... | 07/12/2005 |
| 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 |
| 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 |
| 6323785 | Automatic railroad alarm system A warning system provides for notification of the approach of a track guided train to a user work area perimeter. The system includes at least one sensor, preferably a plurality of sensors, for sensing the approach of a train. Data is collected and analyz... | 11/27/2001 |
| 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 |
| 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 |
| 6118067 | Method and apparatus for improved solar concentration arrays A lightweight photovoltaic concentrator is disclosed. The concentrator comprises at least two sections each comprising a cell panel, a radiator panel and a reflector panel. In one embodiment, the concentrator system of the present invention comprises at l... | 09/12/2000 |
| 6113037 | Railroad maintenance-of-way personnel warning system apparatus and method therefor A railroad maintenance-of-way personnel warning system and method therefor provides advanced detection and warning of oncoming trains encroaching the construction area. Magnetometer sensors detect an oncoming train whereby a waning signal is transmitted t... | 09/05/2000 |
| 6105905 | Railway gate system A railway gate system comprising a railway station having an elevated platform area for passengers to stand and a recessed area with a track and a train movable therealong. A gate has a continuous upper restraining rail along its length. A plurality of cy... | 08/22/2000 |
| 6020815 | Utility right-of-way safety monitor A system (18 ) for warning workers in the vicinity of a transportation pathway (10 ), such as a railroad track, of the presence of an oncoming vehicle, includes a detector/transmitter assembly (20 ) for detecting the presence of an oncoming vehicle by sen... | 02/01/2000 |
| 5178349 | Railroad signal system An improved railroad signal system is described in which a train is allowed to approach a block even if a red light is activated for the block. A white numbered light is activated indicating the maximum permissible speed of the train. The system includes ... | 01/12/1993 |
| 4703303 | Solid state railroad lights/gate controller A railroad crossing lights/gate controller for effecting operation of the crossing lights and lowering of the crossing gate during normal train operating conditions and during a gate controller failure mode includes a train sensing input, a gate control c... | 10/27/1987 |
| 4318079 | Motorized tire barrier and signal barrier traffic-way controller A motorized traffic-way controller wherein a retractile tire barrier and opening gate barrier are coordinated to operate in unison by a motor drive that is recycled by closing a mode switch through cam controlled "stop" and "go" switches responsive to the... | 03/02/1982 |
