Electronic lock system with timer/calendar features

Details Electronic lock system with timer/calendar features Electronic lock system with timer/calendar features

E - Fixed Constructions

05

B

342/11.1

E05B 49/00 (2006.01) G07C 1/32 (2006.01) G07C 9/00 (2006.01) E05B 19/00 (2006.01) E05B 47/00 (2006.01)

Patent

CA 1306531

ELECTRONIC LOCK SYSTEM WITH TIMER/CALENDAR FEATURES Abstract An electronic lock system is disclosed in which a key can be assigned a limited lifetime, such as by storing data indicative of an expiration date in a key memory. Whenever the key is used with a lock, the lock first examines this key data and verifies that the key is still timely before performing any operations. After a key's expiration date has passed, it is useless unless a new expiration date is stored in its memory. By this arrangement, keys that are lost or stolen soon lose their efficacy and no longer pose a threat to system security. The invention also permits the lock administrator to issue keys with different useful lives so that, for example, a person who needs a key for only one day can be issued a key that expires the next day. A variety of other operational features are also disclosed.

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