Patent ID: 6352158
Filing Date: 2002-03-05
Classification: B65D

Abstract:
A child-resistant blister package for unit dose products, said package comprising a blister layer and a cover layer, said blister layer being formed of a planar material and having at least one perforated line and at least two cells contiguous with said perforated line of said blister layer, said cells having a peripheral planar flanged portion and a blister portion projecting from said flanged portion to form a cavity in which a product is to be located, said cover layer being formed of a planar material and having at least one perforated line and at least two cells contiguous with said perforated line of said cover layer, each cell of said cover layer being of the same shape and size as a corresponding cell of said blister layer, said cover layer being fixedly secured to said blister layer along said flanged portions, with said at least one perforated line of said cover layer being aligned with said at least one perforated line of said blister layer and with said cells of the cover layer being coincident with said cells of said blister layer, said blister layer additionally comprising a generally keyhole shaped opening in at least one of its cells, said keyhole shaped opening comprising an elongated slit having a pair of ends and a hole at a first one of said pair of ends of said slit, said keyhole shaped opening being located in said cell so that said first one of said pair of ends is located adjacent but spaced by a gap of a predetermined length slightly from said at least one perforated line, and with said hole being located directed toward said blister portion, said package being resistant to tearing by a child, but tearable by an adult along said at least one aligned perforated lines and from there across said gap to said slit of said keyhole shaped opening.