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.
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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