Tamper detection
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 4, 2003
Grant Date -
N/A
app pub date -
Jan 27, 1999
filing date -
Jan 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tamper evidence device for a secure housing containing electronic circuits includes a zinc air cell and a bi-stable latch circuit connected to be powered by the cell. The zinc air cell requires a supply of oxygen for activation of the cell. Normally when the secure housing is intact and unbreached, a pad seals an aperture for ingress of oxygen to the cell and the cell does not generate any electrical power. However if the secure housing is opened or otherwise breached the pad is displaced and oxygen enters the cell and electrical power is generated to power the latch circuit and thereby set the bi-stable latch circuit to provide evidence of the breaching of the secure housing.
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