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GASOLINE PUMP MULTIPLEXER SYSTEM FOR REMOTE INDICATORS FOR SELF-SERVICE GASOLINE PUMPS

  • US 3,641,536 A
  • Filed: 04/14/1970
  • Issued: 02/08/1972
  • Est. Priority Date: 04/14/1970
  • Status: Expired due to Term
First Claim
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1. In a dispensing system having at least one dispensing apparatus which is capable of generating separate triggering pulses corresponding to fractional parts of at least two different units of measurement related to the dispensed product, a multiplexer system comprising:

  • a pulse width modulator responsive to one of said triggering pulses for generating a series of pulses having a first duration separated by intervals having a second duration, said pulse width modulator also being responsive to another of said triggering pulses for generating a series of pulses having said second duration separated by intervals having said first duration, and said pulse width modulator further being responsive to the simultaneOus occurrence of the two triggering pulses for generating a series of pulses having said first duration separated by intervals having said first duration, a gated carrier frequency oscillator connected to said pulse width modulator and providing a pulse modulated output, transmission means receiving said pulse modulated output from said gated carrier frequency oscillator for transmitting the modulated signal to a central point, receiver means at said central point for receiving the transmitted signal and providing a detected output, pulse sorter means connected to receive the detected output from said receiver for providing a first output in response to a series of pulses having said first duration and a second output in response to a series of pulses separated by intervals having said first duration, and indicator means connected to each of said first and second outputs of said pulse sorter means for providing an indication at the central point whenever either of said triggering pulses occur.

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