Patent ID: 7898907

Claim:
A time indicator that provides a color indicia after a predetermined period of time has passed after activation, comprising: a substrate having an upper surface and a lower surface and a first portion and a second portion joined at a fold line, the first portion being smaller in area than the second portion; an adhesive coating the upper surface of at least the second portion of the substrate, a first reactant adhered to the upper surface of the first portion of the substrate; a second reactant adhered to the upper surface of the second portion of the substrate; whereby, when the first portion is folded along the fold line so that the upper surfaces of the substrate contact each other, a portion of the adhesive on the second portion remains exposed and the first reactant and second reactant contact each other to activate the indicator and to provide the color indicia after the predetermined period of time after activation passes and wherein an edge of the first portion extends from one end of the fold line to the other end of the fold line and the edge is adjacent to the portion of the adhesive on the second portion that remains exposed along an entire length of the edge.