Electronic identification system

Details Electronic identification system Electronic identification system

1982-05-12

1984-12-04

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

70278, 235382, E05B 4900, H04Q 300, G07F 708

Patent

active

044867514

ABSTRACT:
The identification system consists of an electronic key comprising a passive memory area (10) and a shift register (9) and a lock capable of being coupled with the key. The lock is capable of supplying a pulse causing the code contained in the memory (10) to be loaded into the register (9). The register (9) is looped on itself via connection (113). Before reading the contents of the register (9) a set number of clock pulses, counted by the control circuit (149) and transmitted by the electronic lock on the H terminal, produces a series of permutations of the contents of the shift register (9). After this permutation phase, the AND gate (157) allows the data contained in the shift register (9) to flow out through the output terminal S due to the action of additional read pulses the number of which is equal to the number of bits in the register (9).

REFERENCES:
patent: 3859634 (1975-01-01), Perron et al.
patent: 3872435 (1975-03-01), Cestaro
patent: 3906460 (1975-09-01), Halpern
patent: 3944976 (1976-03-01), France
patent: 4004133 (1977-01-01), Hannan et al.
patent: 4031434 (1977-06-01), Perron et al.
patent: 4412216 (1983-10-01), Mole et al.

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