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Passive (non-contact) recharging of secondary battery cell(s) powering RFID transponder tags

  • US 5,300,875 A
  • Filed: 06/08/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 06/08/1992
  • Status: Expired due to Term
First Claim
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1. A radio frequency (RF) transceiver system comprising:

  • a) communication circuitry having control logic and memory;

    b) a secondary battery unit for powering said communication circuitry;

    c) a secondary battery trickle charging unit for charging said secondary battery unit; and

    d) a power unit for supplying voltage and current to said secondary battery trickle charging unit, said power unit is selected from the group including a radio frequency receiving antenna system, a seismic transducer, a piezoelectric transducer, photovoltaic cells and an acoustic transducer;

    wherein said communication circuitry, said secondary battery unit, said secondary battery trickle charging unit and said power unit are all combined to form a single radio frequency transceiver package.

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