Patent ID: 9250709
Filing Date: 2016-02-02
CPC Classification: G06F,H04M

Claim Text:
1. A device comprising: an enclosure; circuitry located on an electrical circuit board within said enclosure; at least one switch assembly operative to sense when said enclosure is opened; and tamper indication circuitry operative to receive an input from said at least one switch assembly and to provide an output indication of possible tampering with said circuitry located on said electrical circuit board within said enclosure, said at least one switch assembly including a raised resilient dome and an arrangement of electrical contacts located on said electrical circuit board, said electrical contacts including at least first, second and third mutually concentric conductive pads all underlying said dome; said at least first, second and third mutually concentric conductive pads and said raised resilient dome being configured and arranged such that as long as said enclosure is closed in a non-tampered state, said raised resilient dome is in electrical contact with some but not all of said at least first, second and third mutually concentric conductive pads, said tamper indication circuitry being operative such that when electrical connections between said at least first, second and third mutually concentric conductive pads change from those in said non-tampered state, an output indication of possible tampering is provided.