Vehicle identification apparatus

Claim 1

A RAILROAD CAR IDENTIFICATION APPARATUS COMPRISING A TRANSPONDER TO BE MOUNTED ON A RAILROAD CAR ADAPTED TO RUN ON RAILROAD TRACKS, SAID TRANSPONDER CONSISTING OF A PLURALITY OF CRYSTALS TUNED TO DIFFERENT FREQUENCIES, AN ANTENNA MOUNTED ON SAID CAR, SAID ANTENNA BEING CONNECTED IN ENERGY TRANSFER CONNECTION TO SAID CRYSTALS, AND A TRASMITTER-RECEIVER DEVICE SAID DEVICE COMPRISING AN ANTENNA LOCATED ALONG SAID TRACK, MEANS FOR PRODUCING PERIODIC PULSES OF AN UNMODULATED WAVE OF A FREQUENCY TO ENERGIZE ALL OF SAID TRANSPONDER CRYSTALS CONNECTED TO SAID FIRST NAMED ANTENNA UPON ENERGY TRANSFER FROM SAID LAST NAMED ANTENNA TO SAID FIRST NAMED ANTENNA, A RECEIVER HAVING AN INPUT TERMINAL CONNECTED TO SAID PULSE PRODUCING MEANS AND HAVING AN OUTPUT TERMINALS, MEANS FOR PREVENTING SAID RECEIVER FROM RECEIVING SAID PULSES DURING THE PRODUCTION THEREOF, A PLURALITY OF CRYSTALS CONNECTED TO THE OUTPUT TERMINALS OF SAID RECEIVER, WHEREBY UPON APPLYING PULSES TO SAID SECOND MENTIONED ANTENNA, SAID CRYSTALS OF SAID CAR ARE ENERGIZED AND UPON THE CESSATION OF SAID PULSES, CORRESPONDING CRYSTALS CONNECTED TO SAID RECEIVER ARE ENERGIZED, AND