Patent ID: 7223015

Claim:
A tamper-indicating bag, comprising: first and second walls joined together along spaced joining lines to form an enclosure having an open end; a tamper-evident indicator extending in a longitudinal direction, the tamper-evident indicator including a backing layer joined to said first wall at said open end of said enclosure, a layer of a release material disposed in a predetermined pattern on said backing layer so as to define first regions in which said release material is present and second regions in which said release material is not present, adjacent ones of said first regions being spaced apart by a first distance in said longitudinal direction, and a layer of ink disposed over said release material layer, said ink layer including a plurality of spaces devoid of ink arranged in a selected pattern, adjacent ones of said plurality of spaces being spaced apart in said longitudinal direction by a second distance different from said first distance, said selected pattern being out of registry with said predetermined pattern of said release material so as to define regions in which said ink overlies said release material and regions in which said ink does not overlie said release material; a layer of adhesive adapted to secure said indicator to said second wall in a sealed condition of said enclosure so that said ink layer is disposed between said backing layer and said adhesive layer; said ink layer having a greater adhesion to said second wall than to said backing layer in regions overlying said release material, and having a lower adhesion to said second wall than to said backing layer in regions not overlying said release material so that, upon separation of said backing layer from said second wall, portions of said ink layer will separate from said backing layer while a remainder of said ink layer will not separate from said backing layer, whereby said predetermined pattern will be visible in said indicator.