Electronic identification device

Details Electronic identification device Electronic identification device

1984-05-11

1988-07-05

Griffin, Robert L.

Communications: electrical

Continuously variable indicating

With meter reading

34082532, 235382, 361172, G06F 704, G06K 500

Patent

active

047558156

ABSTRACT:
The device consists of a key having a passive memory zone and a circulating register, the code contained in the passive zone being intended to be transferred to the circulating register when the key is introduced into a lock, so that the said code may be transferred from the circulating register to the lock to be compared there with a reference code contained in the lock. The key comprises a circuit which is provided with a counter which is incremented each time voltage is applied to the key and a system for resetting the counter to zero, when the code is successfully transferred from the key, so that after a number of attempts determined by the counter of unsuccessful transfer attempts, the passive memory zone is destroyed by the output signal emitted by the counter.

REFERENCES:
patent: 4038637 (1977-07-01), Peters
patent: 4412216 (1983-10-01), Mole et al.
patent: 4481513 (1984-11-01), Mole et al.
patent: 4486751 (1984-12-01), Mole et al.

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