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Callahan Bernard E: Vehicle data recorder employing data compression. Vapor Corporation, Liss Morris, February 4, 1975: US3864731 (16 worldwide citation)

An axle pickup generates signals each time a vehicle travels a predetermined distance. Means are provided for measuring distance travelled as well as measuring changes in vehicle speed. If the speed has varied between sequential signals, or if particular events are detected during sequential signals ...


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Callahan Bernard E, Higgins Philip M: Analog speed detector. Vapor Corporation, Zickert Lloyd L, February 18, 1975: US3867647 (11 worldwide citation)

A speed detector for producing from the output of an axle-mounted transducer an analog output signal indicative of the speed of a moving vehicle. A signal processing circuit responsive to the output of the transducer generates a square-wave control signal which is utilized to control the recurrent c ...


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Callahan Bernard E: Enregistreurs de donnees de trafic a condensation de donnees, Vehicle data recorder employing data compression. Vapor Corporation, July 31, 1979: CA1059619

INVENTOR: BERNARD E. CALLAHAN TITLE: VEHICLE DATA RECORDER EMPLOYING DATA COMPRESSION ABSTRACT OF THE DISCLOSURE: An axle pickup generates signals each time a vehicletravels a predetermined distance. Means are provided for measur-ing distance travelled as well as measuring changes in vehiclespeed. I ...


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Callahan Bernard E, Carlson George A, Kruse Richard H, Noens Richard H, Daniels Richard N, Stumpf Richard A: Systeme vehiculaire de manipulation et de controle de donnees, Vehicular data handling and control system. Vapor Corporation, BORDEN LADNER GERVAIS, November 23, 1982: CA1136276

VEHICULAR DATA HANDLING AND CONTROL SYSTEM ABSTRACT An onboard unit consisting of a tape recorder, andassociated data handling components utilized to provide recordsof vehicular operating informatin including speed, distance,power level, braking level traction motor current and othercontrol events. ...


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Callahan Bernard E, Christianson Edward A: Detecteur de patinage sur roues de vehicules ferroviaires, Slip-slide detector system for railway car wheels. Vapor Canada, BORDEN LADNER GERVAIS, April 14, 1981: CA1099367

ABSTRACT OF THE DISCLOSURE A sensor mounted on each axle of a railroad car gen-erates digital signals related to axle rotation. The digitaloutputs from the sensors are fed to counters which drive adetector which compares the speeds of the axles. When wheelslip indicated by a pulse count difference b ...