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Security enclosures

  • US 5,285,734 A
  • Filed: 07/16/1992
  • Issued: 02/15/1994
  • Est. Priority Date: 07/24/1991
  • Status: Expired due to Fees
First Claim
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1. A laminate for use in forming security enclosures comprising:

  • a flexible, electrically insulating sheet carrying lines of electrically conductive material on each side, the lines defining a conductor extending over both sides of the sheet, electrical connection between lines on one side of the sheet and respective lines on the other side of the sheet being provided by line connections located adjacent to edges of the sheet and extending through the sheet, and at least one edge of the laminate the line connections adjacent to said at least one edge being spaced inwardly from said one edge of the sheet and separated from said one edge by a line-carrying portion of sheet, an attempt to penetrate the laminate resulting in damage to the lines and changing a detectable electrical characteristics of the conductor; and

    means for connecting the conductor to means for detecting such changes wherein the sheet further includes a line carrying core portion completely bounded by said line connections and a line carrying extension portion at an edge of the core portion at said at least one edge of the sheet, the core portion having lines on one side of the sheet connected to lines on the other side of the core portion through said line connections and also having lines connected to lines on the extension portion.

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