Package construction for opening only by a predetermined procedure

Claim 1

A package construction for opening only by a predetermined process comprising a generally flat carrier layer having a through cut-out located in spaced relation within the boundary of the carrier layer to define a hole, a blister formation on said carrier layer spaced from said cut-out and opening to one side of said carrier layer, and a relatively flexible closure layer on said one side of and in facing engagement with said carrier layer extending across and in closing relation with both said blister and cut-out, said carrier and closure layers being releasably adhesively secured together throughout the entire extent of their facing engagement for maximum strength and resistance to blister opening except by the predetermined procedure, and a weakened severance line formed in said carrier and closure layers extending between spaced edge locations of said layers and generally chordally across said cut-out, for deliberate manual separation along said severance line to expose for intentional grasping only a closure layer portion retained with a straight severance edge relatively taut in position extending across said cut-out between spaced bounding edge regions of said hole.