UNION SWITCH & SIGNAL INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6135665 Clamp for railroad coupler headExpiredNov 10, 97Oct 24, 00[F16C]
6108220 Solid state fail-safe control of an AC load utilizing synchronous switchingExpiredFeb 20, 98Aug 22, 00[H02M]
6097302 System and method for monitoring a plural segment light-emitting displayExpiredJun 23, 99Aug 01, 00[G09F]
6087950 Detector for sensing motion and direction of a railway deviceExpiredSep 01, 99Jul 11, 00[G08B]
6052050 Two-wire signal transmitter and method for maintaining integrity of electrical contactsExpiredFeb 13, 98Apr 18, 00[H04M]
6008731 Detector for sensing motion and direction of a railway vehicleExpiredJul 30, 97Dec 28, 99[G08B]
5922034 Programmable relay driverExpiredDec 06, 96Jul 13, 99[G06G]
5812102 Vital monitoring system for seven-segment display used in railroad applicationsExpiredMar 12, 97Sep 22, 98[G06F]
5791602 Plate antenna method using integral noise mitigation for railway cab signalExpiredJan 10, 97Aug 11, 98[B61L]
5764162 Micropower impulse radar based wheel detectorExpiredMay 02, 96Jun 09, 98[G08G]
5747954 Highway crossing guard mechanism controllerExpiredJan 30, 97May 05, 98[B61L]
5711497 Cab signaling apparatus and methodExpiredDec 15, 95Jan 27, 98[B60L]
5697584 Railroad searchlight signal with solid state illuminant and aspect indicationExpiredMay 13, 96Dec 16, 97[B61L]
5675868 Latching device for a door of a railway train stop housingExpiredOct 04, 96Oct 14, 97[E05D]
5676337 Railway car retarder systemExpiredJan 06, 95Oct 14, 97[B61K]
5664744 Railway highway crossing signalExpiredJul 11, 95Sep 09, 97[B61L]
5639047 Railroad signal with remote light sourceExpiredMay 10, 96Jun 17, 97[B61L]
5622339 Plate antenna method using integral noise mitigation for railway cab signalExpiredFeb 21, 95Apr 22, 97[B61L]
5598992 Railway switch circuit controllerExpiredJul 26, 95Feb 04, 97[B61L]
5561762 Malicious fault list generation methodExpiredJun 06, 95Oct 01, 96[G06F]

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