Locking system using a key including an IC memory

Details Locking system using a key including an IC memory Locking system using a key including an IC memory

1992-12-28

1995-06-06

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082531, 70278, G06F 704

Patent

active

054226341

ABSTRACT:
A locking system which is operated with card keys and the locking system is generally provided for a door lock of a guest room in a hotel. The locking system requires no time piece, and a card key including an IC memory can be used many times without illegal use of the key such as forgery or alteration of the key or illegal use by taking the key back intentionally. In the locking system, first and second identification codes have been set in the IC memory. A lock permits an unlocking operation when the first identification code read from the IC memory is coincident with a third identification code preset in the lock. In case of the first and third identification codes different from each other, when the second identification code has been stored in the IC memory, the first and third identification codes are replaced by the second identification code so that the first and third identification codes coincide with each other, and the second identification code is erased from the IC memory.

REFERENCES:
patent: Re29057 (1976-11-01), Enikeieff et al.
patent: Re29846 (1978-11-01), Genest et al.
patent: 4207555 (1980-06-01), Trombly
patent: 4519228 (1985-05-01), Sornes
patent: 4558175 (1985-12-01), Genest et al.

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