Patent ID: 8714437

Claim:
A printable sheet material for forming an envelope having an opening structure comprising: a front panel having an integral separable portion; a first seal flap connected to said front panel by an upper fold line; a back panel connected to said front panel by a lower fold line, upper and lower edges of said separable portion being adjacent said upper and lower fold lines respectively, said upper and lower edges being formed by a pair of tearable lines positioned in said front panel, a tearing starting mechanism integrated into a V-shaped third tearable line extending between said pair of tearable lines, said three tearable lines permitting said separable portion to be at least partially separated from a remaining portion of said front panel; and a patch affixed to said remaining portion of said front panel solely by an adhesive attachment device on said front panel and positioned behind said separable portion, said patch being releasably attached to said separable portion by an affixation mechanism at an affixation point, whereby when said separable portion is detached from said front panel along said tearable lines and from said patch at said affixation point, said patch is exposed and remains affixed to said front panel solely by said adhesive attachment device, and including at least one release cut formed in one of said separable portion and said patch adjacent said affixation point.