| US 7,616,116 B2 | ||
| Electronic tamper evident seal | ||
| Jakob Ehrensvard, Taby (Sweden); Fredrik Einberg, Huddinge (Sweden); Robert Debrody, Wayne, N.J. (US); Richard Dreisbach, Andover Township, N.J. (US); and George Lundberg, Pompton Plains, N.J. (US) | ||
| Assigned to E. J. Brooks Company, Livingston, N.J. (US) | ||
| Filed on Nov. 13, 2006, as Appl. No. 11/559,221. | ||
| Claims priority of provisional application 60/597174, filed on Nov. 15, 2005. | ||
| Prior Publication US 2007/0120381 A1, May 31, 2007 | ||
| Int. Cl. G08B 13/14 (2006.01) | ||
| U.S. Cl. 340—571 [340/568.1; 340/541; 340/542; 340/652] | 32 Claims |
| 1. An electronic security seal comprising:
a body;
an elongated electrically conductive shackle;
first and second electrically conductive terminals secured to the body and coupled to the shackle in a shackle locked state
wherein the terminals form a complex impedance with the shackle, the impedance manifesting the shackle length between the
terminals;
an electrical circuit for measuring the impedance and for indicating a tamper condition; and
a locking arrangement for adjustably locking the shackle to the body.
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