Tear-open sealed containers and closures therefor

Claim 1

A SEALED CONTAINER AND COVER ARRANGEMENT WHICH CAN BE UNSEALED BY REMOVAL OF THE COVER WITHOUT RECOURSE TO A KNIFE OR OTHER TOOL AND WHICH PROVIDES FOR RECAPPING OF THE UNSEALED CONTAINER BY THE REMOVED COVER COMPRISING A CONTAINER BODY HAVING COVER-RETAINING STRUCTURE ADJACENT ITS OPEN END, AND A COVER COMPRISING TWO LAYERS OF SUBSTANTIALLY DIFFERENT STRENGTH HAVING THEIR ADJACENT FACES BONDED TOGETHER, AT LEAST THE OUTER STRONGER LAYER OF SAID COVER EXTENDING ACROSS SAID OPEN END OF THE CONTAINER WITH ITS PERIPHERAL AREA IN GRIPPING ENGAGEMENT WITH SAID COVER-RETAINING STRUCTURE OF THE CONTAINER BODY, ONLY THE INNER AND WEAKER OF SAID LAYERS OF THE COVER BEING SEALED THROUGHOUT A MARGINAL AREA OF THE COVER TO THE CONTAINER BODY TO PROVIDE HERMETIC SEALING OF THE CONTAINER BY SAID INNER LAYER OF THE COVER, THE BOND BETWEEN SAID INNER, WEAKER LAYER OF THE COVER AND SAID CONTAINER BODY BEING STRONGER THAN THE BOND BETWEEN SAID LAYERS OF THE COVER, THE LIFTING OF SAID COVER RELEASING SAID GRIPPING ENGAGEMENT BETWEEN ITS OUTER LAYER AND SAID COVERRETAINING STRUCTURE OF THE CONTAINER BODY AND ALSO BREAKING THE BOND BETWEEN SAID LAYERS OF THE COVER AND SO LEAVING SAID MARGINAL AREA OF THE INNER LAYER OF THE COVER ATTACHED SOLELY TO THE CONTAINER BODY FOR ACCESS TO THE INTERIOR OF SAID CONTAINER BODY, SAID OUTER LAYER OF THE REMOVED COVER REMAINING ESSENTIALLY INTACT FOR SUBSEQUENT RECAPPING OF THE UNSEALED CONTAINER BY RESTORATION OF SAID GRIPPING ENGAGEMENT BETWEEN SAID RETAINING STRUCTURE OF THE CONTAINER BODY AND SAID PERIPHERAL AREA OF THE COVER.