초록 ▼

A tamper-indicating device which is attached by adhesives to a closure and which includes a sheet of material, sensitive to an ambient condition such as light or oxygen, that effects a time-delayed, irreversible change in appearance in response to exposure to the condition, which is automatically ex

A tamper-indicating device which is attached by adhesives to a closure and which includes a sheet of material, sensitive to an ambient condition such as light or oxygen, that effects a time-delayed, irreversible change in appearance in response to exposure to the condition, which is automatically exposed upon the opening of a closure, such as the removal of a bottle cap from a bottle. The device consists of a lower sheet impermeable to the ambient condition and shaped to be attached at an underside to a lower closure member, an intermediate sheet superposed to the lower sheet and including the sensitive material, and an upper sheet, impermeable to the ambient condition, and superposed to the intermediate sheet and shaped to be attached to an upper closure member. A first, relatively strong adhesive which is used to attach the lower sheet to the lower closure member and to the intermediate sheet, and to attach the upper sheet to the upper closure member. A second, relatively weak adhesive is used to join the upper surface of the intermediate sheet to the underside of the upper sheet at the peripheries of the sheets, so that upon opening the closure, the upper sheet is separated from the intermediate sheet, thereby exposing the sensitive material to ambient light. The adhesives are selected to be impermeable to the ambient conditions as well. The tamper-indicating device may be used with cellophane packages and inserted between upper and lower sheets and positioned to form an integral part of the heat sealed edges of such packages.

대표청구항 ▼

A tamper-indicating device comprising: a lower impermeable sheet shaped to be attached at an underside thereof to a lower closure member; an intermediate sheet superposed to said lower sheet and including means on an upper surface thereof sensitive to an ambient condition, said sensitive means adapt

A tamper-indicating device comprising: a lower impermeable sheet shaped to be attached at an underside thereof to a lower closure member; an intermediate sheet superposed to said lower sheet and including means on an upper surface thereof sensitive to an ambient condition, said sensitive means adapted to effect a time-delayed change in appearance of said upper surface in response to exposure to the ambient condition; an upper impermeable sheet superposed to said intermediate sheet and shaped to be attached at an upper surface thereof to an upper closure member; first adhesive means for attaching said lower sheet to a lower closure member and to said intermediate sheet, and for attaching said upper sheet to an upper closure member; and second adhesive means, weaker than said first adhesive means, for joining said upper surface of said intermediate sheet to an underside of said upper sheet at outer peripheries thereof to form a substantially impermeable seal.