Remote interrogation decoding circuitry

Claim 1

SELECTIVE RECEIVER CIRCUITRY FOR DECODING SIGNAL WAVES TRANSMITTED AT A PLURALITY OF DISCRETE FREQUENCIES IN CODES COMBINATION COMPRISING INDIVIDUAL PRETUNED SECTIONS EACH RESPONSIVE TO A PARTICULAR ONE OF SAID SIGNAL FREQUENCIES, A GASEOUS DISCHARGE TUBE IN CIRCUIT CONNECTION WITH EACH OF SAID SECTIONS, MEANS FOR BIASING SAID TUBES TO A FIRST STATE NEAR TO THEIR DISCHARGE VOLTAGE AND MAINTAINING INDIVIDUAL ONES OF SAID DISCHARGE TUBNES IN SAID FIRST STATE IN THE ABSENCE OF A RESPONSIVE SIGNAL FROM ITS RESPECTIVE PRETUNED SECTION; INDIVIDUAL ONES OF SAID DISCHARGE TUBES SWITCHING TO A SECOND STATE, CORRESPONDING TO THE FIRING THEREOF, RESPONSIVE TO THE RECEPTION OF ITS DISCRETE FREQUENCY AT ITS RESPECTIVE PRETUNED SECTION, A DIODE INDIVIDUALLY CONNECTED WITH EACH OF SAID DISCHARGE TUBES WHEREBY EACH SECTION WHEN ENERGIZED WITH A SIGNAL AT ITS PRETUNED FREQUENCY SWITCHES ITS GASEOUS DISCHARGE TUBE TO ITS SECOND STATE FOR ALTERING THE CURRENT THROUGH ITS CORRESPONDING DIODE AND ACTUATING SAID DIODE TO A SIGNAL RESPONSIVE CONDITION, AND DETECTION MEANS IN CIRCUIT WITH ALL OF SAID DIODES TO PROVIDE AN OUTPUT SIGNAL WHEN ALL OF SAID DIODES ARE ACTUATED TO THEIR SIGNAL RESPONSIVE CONDITION UPON THE RECEPTION OF SIGNAL WAVES IN SAID CODED COMBINATION, SAID GASEOUS DISCHARGE TUBE, WHEN IN SAID FIRST STATE ISOLATING ITS RESPECTIVE DIODE FROM SIGNALS OTHER THAN ITS DISCRETE FREQUENCY, FOR ABSOULTELY MAINTAINING THE CONDITION UPON THE RECEPTION OF SIGNAL WAVES IN SAID CODED COMMEANS, TIME DELAY MEANS WITH EACH OF SAID DISCHARGE TUBES TO MAINTAIN THE SIGNAL RESPONSIVE CONDITION IN THE ASSOCIATED DIODE UPON ANY TUBE DISCHARGE FOR AT LEAST THE DURATION PERIOD OF TRANSMISSION OF SAID CODED DISCRETE FREQUENCY COMBINATION AS SUCCESSIVE SIGNAL WAVES, SAID TIME DELAY MEANS INCLUDING CIRCUIT MEANS FOR AUTOMATICALLY RETURNING ITS ASSOCIATED DISCHARGE TUBE TO ITS FIRST STATE, WITHIN SAID DURATION PERIOD.