Identification system
First Claim
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1. In a remotely powered portable member having circuitry for storing and transmitting coded information, the improvement comprising:
- first coupling means for receiving a signal of a predetermined frequency transmitted via one of a magnetic field and an electric field;
power means connected to said first coupling means for deriving operating power from the received signal for use by said circuitry;
circuit means connecting said circuitry to said first coupling means, for utilizing said predetermined frequency as a clock signal for timing of said circuitry; and
second coupling means connected to said circuitry for transmitting coded information stored by said circuitry via the other one of the magnetic field and the electric field.
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Abstract
A remotely powered portable member having circuitry for storing and transmitting coded information. A first coupling device is provided for receiving a signal transmitted via one of a magnetic field and an electric field. A power circuit is connected to the first coupling device for deriving operating power from the received signal for use by the circuitry. A second coupling device is connected to the circuitry for transmitting coded information stored by the circuitry via the other one of the magnetic field and electric field.
378 Citations
24 Claims
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1. In a remotely powered portable member having circuitry for storing and transmitting coded information, the improvement comprising:
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first coupling means for receiving a signal of a predetermined frequency transmitted via one of a magnetic field and an electric field; power means connected to said first coupling means for deriving operating power from the received signal for use by said circuitry; circuit means connecting said circuitry to said first coupling means, for utilizing said predetermined frequency as a clock signal for timing of said circuitry; and second coupling means connected to said circuitry for transmitting coded information stored by said circuitry via the other one of the magnetic field and the electric field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A remotely powered portable member having circuitry for storing and transmitting coded information comprising:
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a read-only memory for storing coded information first coupling means for receiving a signal of a predetermined frequency transmitted via a magnetic field; power means connected to said first coupling means for deriving power from the received signal for use by the circuitry in said portable member; circuit means, connected to said first coupling means and responsive to said predetermined frequency of a received signal, for reading said coded information from said read only memory; means for generating a carrier signal; modulating means for modulating said carrier signal with the read coded information from said memory; and second coupling means connected to the output of said modulating means for transmitting the modulated carrier signal via an electric field. - View Dependent Claims (21, 22, 23, 24)
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Specification