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| Number | Title | Issue Date |
| 7295017 | Method and system for calculating railroad track ballast resistance A method of estimating a resistance value for ballast, over a given length of track, used at a crossing on a railroad track that has a crossing warning system where a inductance of the track over the given length, an inductance of the track over the given length of ... | 11/13/2007 |
| 7210570 | Device for the dynamic weighing of postal items The device for dynamically weighing postal items (P) comprises a plate (1) floatingly mounted on a weight sensor, and a conveyor belt mounted on the plate to move the postal items in a longitudinal direction (D) of the conveyor. The conveyor has two parallel ... | 05/01/2007 |
| 7202797 | System and a method for detecting, locating and discerning an approach towards a linear installation A system and a method for detecting, locating and identifying incidents of approaching a linear installation (e.g.—buried pipe line, railway, fence etc.), that includes plurality of sensing units positions in an array along the length of the linear installation, a... | 04/10/2007 |
| 7075427 | Traffic warning system The present invention is directed to a train detection system for detecting the velocity, presence, and direction of a railroad car which may be utilized in existing railroad crossing installations. The train detection system is suitable for self-testing of its comp... | 07/11/2006 |
| 6966146 | Two directional crossing gate arm protection assembly A railroad crossing gate assembly includes a gate arm adapter, which is pivotally mounted to allow a lowered gate arm to rotate in response to a generally perpendicular force in a generally horizontal plane either toward or away from a railroad crossing. The gate ar... | 11/22/2005 |
| 5924652 | Island presence detected A reliable and consistent electrical contact path between the rails of a section of railroad track established by the shunting effect of the wheels and axles of a train is ensured by applying time-spaced, short duration electrical pulses to the rails at a... | 07/20/1999 |
| 5502367 | Highway crossing control Highway crossing gate control circuit in which a permanent magnet motor is controlled to drive up and drive down the gate arm by utilization of a single motor control relay and controller contacts which sense the position of the gate arm. The motor polari... | 03/26/1996 |
| 5170970 | Method and apparatus for improving rail shunts A reliable and consistent electrical contact path between the rails of a railroad track established by the shunting effect of the wheels and axles of a train is ensured by applying an alternating current signal to the rails at a voltage level sufficient t... | 12/15/1992 |
| 4672223 | Proving safe operation To ensure the safe operation of an electronic circuit, for example an amplitude modulated carrier signal generator, an output of the circuit is analyzed to prove the presence of predetermined signal characteristics, for example the carrier signal, or a mo... | 06/09/1987 |
| 4365777 | Train approach detector A train approach detector uses frequencies in the audio spectrum to activate grade crossing protection devices in advance of and during the presence of railroad trains at grade crossings. The detector is completely solid state, and includes one transmitte... | 12/28/1982 |
| 4324376 | Railroad highway crossing warning system A railroad highway crossing warning system including pickup coils for sensing current flowing in the track rails of an approach zone, a circuit for sensing the voltage across the track rails, band-pass filter circuits for filtering the voltage and current... | 04/13/1982 |
| 4307860 | Railroad grade crossing constant warning protection system A train detection system for protecting a railroad highway crossing having an a.c. transmitter center-feeding voltage signals into the track rails and having a receiver including at least a pair of coils located on opposite sides of the crossing and dispo... | 12/29/1981 |
| 4283031 | System controlling apparatus which compares signals from sensors monitoring passing objects with pre-determined parameter information to control the system A system controlling apparatus wherein an array of sensors are used for detecting information and for providing signals indicative of information concerning passing articles such as presence of an article at a sensor, number of articles passing, the direc... | 08/11/1981 |
| 4251041 | Multiplexing means for motion detectors at grade crossings At a railroad crossing, a single motion detection unit is selectively coupled to an occupied track in such manner that safe, effective and efficient control is obtained over the crossing alarm device. The means for coupling the motion detection unit inclu... | 02/17/1981 |
| 4172576 | Highway crossing system with motion detecting apparatus A highway crossing warning system includes a motion detector transmitter and receiver respectively coupled to the track rails adjacent the highway crossing for detecting motion of an approaching train. Wrap-around approach sections initiate operation of t... | 10/30/1979 |
| 4151969 | System for selectively determining the location of a railway car moving along a railway track The velocity of a railway car travelling along a particular track can be determined by measuring the distance travelled by the car during a predetermined time interval. This distance travelled is measured by determining the location of the car with respec... | 05/01/1979 |
| 4120471 | Highway crossing system with improved ring sustain feature A highway crossing warning system includes a motion detector transmitter and receiver respectively coupled to the track rails adjacent the highway crossing for detecting motion of an approaching train. Wrap-around approach sections initiate operation of t... | 10/17/1978 |
| 4026505 | Variable high pass coupler A high pass coupler or filter network provides a bypass for relatively high frequency AC signals, while providing DC signal isolation and avoiding loading the track for relatively low frequency AC signals, around a set of insulated joints in a railroad tr... | 05/31/1977 |
| 3977634 | Computer for motion sensing device setup A system for calibrating a receiver in a railroad grade crossing protection system having a transmitter and receiver connected to the rails and a defined approach track section, utilizes the receiver detected motion voltage to determine low ballast resist... | 08/31/1976 |
| 3958782 | Shunt enhancement logic circuit A signaling circuit adapted to be used with railroad tracks or the like for ensuring fail-safe performance in respect to the operation of a control device, such as a track relay, which must function in a fail-safe manner, typically to become deenergized a... | 05/25/1976 |
| 3944173 | Railroad crossing motion sensing system An apparatus for detecting an approaching train within a track section utilizes a transmitter coupled to the rails at a feed point for applying a current to the track section. There is a receiver coupled to the track section for producing a signal represe... | 03/16/1976 |
