Electronic travel pass
First Claim
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1. Apparatus for transferring data from one device to another, comprising:
- a portable device,a device that is relatively stationary as compared to said portable device, anddata transfer means for transferring data from said stationary device to said portable device, and from said portable device to said stationary device, comprising means for transmitting data in binary form via said data transfer means from either one of said devices to the other of said devices, by producing a series of pulses and at predetermined times during said series providing, or not providing, a pulse,each said device having a counter for determining said predetermined times, andmeans responsive to at least one pulse of said series for synchronizing the counters.
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Accused Products
Abstract
A data transfer system transfers data between a smartcard and a reader by transmitting a series of binary pulses, where the absence or presence of single predetermined pulses within the series communicate the data bits. By providing a function mode switch on the card, it may be used both for both private transactions and authorizations at a distance.
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Citations
34 Claims
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1. Apparatus for transferring data from one device to another, comprising:
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a portable device, a device that is relatively stationary as compared to said portable device, and data transfer means for transferring data from said stationary device to said portable device, and from said portable device to said stationary device, comprising means for transmitting data in binary form via said data transfer means from either one of said devices to the other of said devices, by producing a series of pulses and at predetermined times during said series providing, or not providing, a pulse, each said device having a counter for determining said predetermined times, and means responsive to at least one pulse of said series for synchronizing the counters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 30)
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11. Apparatus for transferring data from one device to another, comprising:
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a portable device, a device that is relatively stationary as compared to said portable device, transfer means for transferring signals from said stationary device to said portable device, and from said portable device to said stationary device, when and only when said devices are positioned in proximity to each other, said transfer means comprising (a) a first means for transferring signals from one of said devices to the other of said devices, and (b) a second means for transferring signals from one of said devices to the other of said devices, and means associated with one of said devices for applying pulses to the said first means and to said second means, including means rendering the pulses fed to said first means out of phase with the pulses fed to said second means. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. Apparatus for transferring data from one device to another, comprising:
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a portable device, a device that is relatively stationary as compared to said portable device, transfer means for transferring signals from said stationary device to said portable device, and from said portable device to said stationary device, said transfer means comprising (a) a first pair of conducting plates one of which is on one of said devices and the other of which is on the other of said devices, and (b) a second pair of plates one of said second pair of plates being on one of said devices and the other plate of the second pair being of the other of said devices, said pairs of plates constituting means for transferring signals from one of said devices to the other of said devices when each plate on one of said devices is in proximity to a plate on the other device, and Faraday cage means on at least one of the plates of at least one of said devices for enhancing transfer of signals between said devices. - View Dependent Claims (29, 32, 33, 34)
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31. Apparatus for transferring data from one device to another, comprising:
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a portable device, a device that is relatively stationary as compared to said portable device, data transfer means for transmitting data from said stationary device to said portable device, and from said portable device to said stationary device, comprising means for transmitting data in binary form via said data transfer means from either one of said devices to the other of said devices, including clock means for producing a series of groups of pulse positions and also including means for sending data during a predetermined one of said positions of each group and sending pulses during most of the remaining positions of said series.
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Specification