Tamper-proof transparent security plate

Details Tamper-proof transparent security plate Tamper-proof transparent security plate

1978-02-06

1980-10-14

Caldwell, Sr.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340652, 200 6108, 109 21, 52782, 52789, G08B 1304, G08B 1312, E05G 110

Patent

active

042284252

ABSTRACT:
A tamper-proof transparent security plate has a laminated structure of a break-resistant, normally transparent plate member which becomes opaque upon forceful penetration and a transparent alarm plate containing a plurality of frangible electrically conductive wires extending across an area to be protected. Efforts to break the laminated structure render it opaque, making it extremely difficult to locate and tamper with the wires of the alarm plate. Moreover, a selected subset of the wires can be excluded from a series alarm grid to further thwart efforts to bypass an associated alarm circuit. In a preferred embodiment, the voltage applied to the wires is adjustable to provide an optional heating, de-icing, or defogging capability.

REFERENCES:
patent: 1099480 (1914-06-01), Winter
patent: 1223583 (1917-04-01), Hitchcock
patent: 3696373 (1972-10-01), Dunn et al.
patent: 3825918 (1974-07-01), Laidlaw et al.
patent: 3825920 (1974-07-01), Nelson et al.
patent: 3947837 (1976-03-01), Bitterice

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