Time controlled lock system

Details Time controlled lock system Time controlled lock system

1995-11-08

1999-12-07

Le, Thien Minh

Registers

Systems controlled by data bearing records

Credit or identification card systems

2353825, G06K 500

Patent

active

RE0364266

ABSTRACT:
A lock system, comprising at least one off-line lock and at least one key, e.g. as a key card with encoded data, said lock including an electro/mechanical locking mechanism which can be affected by the key, and a key reader enabled to read the encoded data on the key, memorize said data and compare these data with data stored in the key reader for the purpose of, depending of certain comparable data, affecting the locking mechanism. The data used in the system comprise user identification, lock identification, valid time window and also override criteria e.g. time related criteria for invalidating prior used keys.

REFERENCES:
patent: 3906447 (1975-09-01), Crafton
patent: 4385231 (1983-05-01), Mizutani et al.
patent: 4450535 (1984-05-01), de Pommery et al.
patent: 4519228 (1985-05-01), Sornes
patent: 4562343 (1985-12-01), Wiik et al.
patent: 5089692 (1992-02-01), Tonnesson

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