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US 5,581,257 AGranted
Radio frequency automatic identification system
AssigneeGordian Holding Corporation
InventorsMorton Greene, G. William Hurley
Life of this patent
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AssigneeGordian Holding Corporation
InventorsMorton Greene, G. William Hurley
Estimating the term…
A radio frequency automatic identification system detects targets which include a plurality of radio frequency resonators. Information is attributed to the target in accordance with the radio frequency response characteristics of the target, such as the resonant frequencies of resonators present, and/or the spatial locations within the target of the resonators. Preferred resonators include thin dipoles, which may be metallizations on a plastic film substrate. Information may be attributed to a target by fabricating the target with resonators disposed at locations to encode information in accordance with a predetermined encoding system; alternatively, resonators may be randomly disposed, and a translation code applied to convert the radio frequency information to particular information in a particular format. Readers for use in the system read the radio frequency response characteristics of a target in the near field of a radiating aperture which is illuminated by a radio frequency source. Items which may be encoded with radio frequency readable information include documents, credit cards, and computer diskettes.
A target for authenticating a document, comprising:
A method for forming a target for use in authenticating a document, comprising the step of disposing a plurality of thin dipoles in a fixed arrangement on a substrate, each of said thin dipoles being formed of an elongated metal article having a fixed spatial position on said substrate, wherein said fixed arrangement of thin dipoles generates a composite RF waveform associated with said document when said plurality of thin dipoles are illuminated with RF energy.
A system for authenticating an object, comprising:
A method for authenticating an object, comprising the steps of:
Dependencies are inferred from the claim text.