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Security features

  • US 6,444,377 B1
  • Filed: 12/29/1999
  • Issued: 09/03/2002
  • Est. Priority Date: 12/29/1998
  • Status: Expired due to Term
First Claim
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1. A security substrate for a security substrate document comprising a permeable base substrate security feature having at least one activatable layer and at least one visually apparent liquid impermeable masking layer, said masking layer comprising a security element which has a layer comprising a security element which has a layer of metal supported on a flexible strip, said at least one activatable layer comprising a composition which is generally non-mobile, said composition further including at least one detectable component, in which under dry conditions said at least one masking layer wholly covers the activatable layer and renders it non-detectable, wherein when the activatable layer is wetted with a liquid via the base substrate, the composition becomes mobile and leaches into the substrate surrounding the masking layer to thereby highlight the masking layer.

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