Integrated circuits with persistent data storage

Details Integrated circuits with persistent data storage Integrated circuits with persistent data storage

2005-10-31

2010-06-15

Brown, Vernal U (Department: 2612)

Communications: electrical

Selective

Interrogation response

C034S080000, C034S080000, C034S080000, C034S080000, C034S540000

Reexamination Certificate

active

07737825

ABSTRACT:
The circuitry introduced in this invention selectively slows down the functioning of an electronic circuit by maintaining a particular state for a prolonged period of time. This circuitry is used not only to achieve the desired effect in maintaining security from electronic thieves trying to circumvent codes but also in other applications such as enabling a circuit to continue to function in the event of a brief loss of power. For example, in an RFD system, if a reader is frequency hopping, a tag loses power for as long as about 400 milliseconds when the reader changes to other frequencies. In a preferred embodiment, the disclosed circuitry is used in conjunction with a destruct sequence.

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