Tamper resisting holographic security seal
First Claim
1. A tamper resistant security seal comprising a laminate having a transparent carrier layer;
- an optical, diffraction pattern defining layer; and
an adhesive layer for adhering the seal to a substrate, wherein an optical pattern defined by the optical, diffraction pattern defining layer is visible from outside the laminate, and wherein an attempt to tamper with the seal will cause an irreversible change in the optical pattern characterized in that the optical, diffraction pattern defining layer is formed by a polymeric layer permanently bonded, directly or indirectly, to the transparent carrier layer, such that any attempt to delaminate the carrier from the optical, diffraction pattern defining layer will irreversibly damage the optical pattern;
in that the adhesive is a pressure sensitive adhesive; and
in that the laminate is such that a reduction in temperature below O°
C. will cause one or both of (a) a contraction of the carrier layer more than the other layers such that there is an irreversible change in the optical pattern, and (b) an irreversible change in the optical pattern upon attempted removal of the seal from a substrate, subsequent to such a temperature reduction.
2 Assignments
0 Petitions
Accused Products
Abstract
A tamper resistant security seal is a laminated tape having a transparent carrier layer (2); an optical, diffraction pattern defining layer (3,4); and an adhesive layer (6) for adhering the tape to a substrate. The optical pattern, such as a hologram, defined by the optical pattern defining layer is visible from outside the laminate. The optical diffraction pattern defining layer (3) is formed by a polymeric layer permanently bonded to the transparent carrier layer which, when heated, causes the diffraction pattern to undergo an irreversible change. The adhesive is a pressure sensitive adhesive. An additional removable support layer may be provided on the carrier. The laminate is constructed so that a reduction in temperature below 0° C. will cause an irreversible change in the diffraction pattern, or is such that subsequent to such a temperature reduction, attempted removal of the tape from a substrate will cause an irreversible change in the diffraction pattern.
111 Citations
28 Claims
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1. A tamper resistant security seal comprising a laminate having a transparent carrier layer;
- an optical, diffraction pattern defining layer; and
an adhesive layer for adhering the seal to a substrate, wherein an optical pattern defined by the optical, diffraction pattern defining layer is visible from outside the laminate, and wherein an attempt to tamper with the seal will cause an irreversible change in the optical pattern characterized in that the optical, diffraction pattern defining layer is formed by a polymeric layer permanently bonded, directly or indirectly, to the transparent carrier layer, such that any attempt to delaminate the carrier from the optical, diffraction pattern defining layer will irreversibly damage the optical pattern;
in that the adhesive is a pressure sensitive adhesive; and
in that the laminate is such that a reduction in temperature below O°
C. will cause one or both of (a) a contraction of the carrier layer more than the other layers such that there is an irreversible change in the optical pattern, and (b) an irreversible change in the optical pattern upon attempted removal of the seal from a substrate, subsequent to such a temperature reduction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- an optical, diffraction pattern defining layer; and
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28. A tamper resistant security seal comprising a laminate having a transparent carrier layer;
- an optical, diffraction pattern defining layer; and
an adhesive layer for adhering the seal to a substrate, wherein an optical pattern defined by the optical, diffraction pattern defining layer is visible from outside the laminate, and wherein an attempt to tamper with the seal will cause an irreversible change in the optical pattern wherein;
the optical, diffraction pattern defining layer is formed by a polymeric layer permanently bonded to the transparent carrier layer, such that any attempt to delaminate the carrier from the optical, diffraction pattern defining layer will irreversibly damage the optical pattern;
the adhesive is a pressure sensitive adhesive, and the adhesive layer defines a pattern of areas with and without adhesive; and
a reduction in temperature below 0°
C. will cause one or both of (a) a contraction of the carrier layer more than the other layers such that there is an irreversible change in the optical pattern, and (b) an irreversible change in the optical pattern upon attempted removal of the seal from a substrate, subsequent to such a temperature reduction.
- an optical, diffraction pattern defining layer; and
Specification