Method of operating a security device, security device and data carriers for use in the method
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United States of America Patent
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-
Dec 13, 1988
Grant Date -
N/A
app pub date -
Feb 17, 1987
filing date -
Jul 9, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lock has means (15,16) for reading from a key (11) a binary encoded number. If the number read from the key is a predetermined number, the lock will store in a memory (19) a further number read from a further key applied immediately after withdrawal of the first key. The device will then recognize the second key, when applied subsequently.
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