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US 5,704,501 AGranted
Container closure assembly including barrier layer with a crystallized, brittle weakened portion
AssigneeEV Family Limited Partnership
InventorEmery I. Valyi
Life of this patent
Estimating the term…
Abstract
A container closure assembly including a container, a barrier layer and a closure member. The barrier layer and closure member completely cover the access opening to the container and the barrier layer includes a weakened portion thereof comprising a crystallized, brittle portion therein which is broken open on removing the closure member.
Claims17
A container closure assembly which comprises:
- a container having an access opening for the container;
- a plastic barrier layer having a rim and a central portion completely covering the access opening and with the barrier layer rim portion attached to said container, said barrier layer including a weakened portion in the central portion of the barrier layer, said weakened portion comprising a crystallized brittle portion in a heat treated zone in the barrier layer central portion;
- a removable closure member adapted to cover said container access opening and barrier layer and engaging said barrier layer, said closure member intimately contacting said barrier layer when said closure member is removed by twisting;
- whereby removal of the closure member by twisting breaks the barrier layer at the weakened portion and opens the container.
1 more element
Dependencies are inferred from the claim text.