Communications: electrical – Continuously variable indicating – With meter reading
Patent
1981-05-19
1983-08-16
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
235380, 34082572, H04Q 900, G06K 1900
Patent
active
043994377
ABSTRACT:
An active transponder device comprises a CMOS integrated circuit including means for receiving an input signal including coded information, a memory for storing said information, and transmitter means for transmitting an output signal including said information, the input signal and the output signal being both low frequency induction communication signals.
Normally, the output signal is emitted in response to an interrogation signal received via the receiving means, and is formed by modulation of that signal with said information after readout from the memory. The transponder operates inherently synchronously, using a single master clock signal which is generated either in an interrogation transmitter or in the programmer for injecting the coded information.
The integrated circuit has a second receiving means used in the injection of the coded information. The injection of a clock-pulse which is in synchronism with the input signal enables the memory to receive the coded information.
The transponder may be used for the identification of e.g. people or articles at the limits of a particular area e.g. a store.
REFERENCES:
patent: 3766523 (1973-10-01), Brocker et al.
patent: 3842246 (1974-10-01), Kohler et al.
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 4236068 (1980-11-01), Walton
patent: 4277837 (1981-07-01), Stuckert
patent: 4298793 (1981-11-01), Melis et al.
Falck John B.
Robson David
Tag Radionics Limited
Yusko Donald J.
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