Security system and lock
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United States of America Patent
Stats
-
Apr 11, 1989
Grant Date -
N/A
app pub date -
Aug 14, 1986
filing date -
Aug 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A code system comprising a temperature-resistance conversion element the change of electric resistance value of which describes a hysteresis loop with respect to a temperature change; a means for changing the temperature of said temperature-resistance conversion element; a means for detecting the change of the electric resistance of said conversion element; and a time counting means of counting the actuation time of said temperature changing means. A hard lock device for use in the code system is also disclosed.
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