Plastisol coatings for easy-open container ends

Claim 1

AN END CLOSURE ADAPTED TO BE ATTACHED TO A TUBULAR CONTAINER BODY, COMPRISING: A SUBSTANTIALLY FLAT PANEL HAVING AN APERTURE THEREIN; A THIN RELATIVELY RIGID PLUG WITHIN SAID APERTURE AND SECURED TO SAID PANEL ALONG THE MAJOR PORTION OF THE PERIPHERY OF SAID PLUG; A PULL TAB FOR MANUALLY REMOVING A TEAR OUT AREA IN SAID PLUG, SAID TAB EXTENDING AWAY FROM SAID APERTURE AT A POINT WHERE SAID PLUG IS FREE FROM SECUREMENT TO SAID PANEL; SAID TEAR OUT AREA DEFINED BY WEAKENED LINES IN SAID PLUG; A RELATIVELY HARD SEALING MATERIAL SEALING SAID PLUG WITH SAID PANEL ALONG SAID MAJOR SECURED PORTION OF THE PERIPHERY OF SAID PLUG; AND A SOFT PLIABLE SEALING MATERIAL HERMETICALLY SEALING SAID PLUG WITH SAID PANEL WHERE SAID PLUG AND SAID TAB JOIN SO THAT WHEN SAID TAB IS MANUALLY PULLED TO REMOVE SAID TEAR OUT AREA FROM SAID PLUG, SAID SOFT PLIABLE SEALING MATERIAL WILL STRETCH DURING INITIAL RUPTURE ALONG THE LINES OF WEAKNESS AND SAID SOFT MATERIAL WILL SUBSEQUENTLY TEAR TO REDUCE THE TENSIONAL FORCES TENDING TO FRACTURE SAID PULL TAB FROM SAID PLUG WHEN BOTH METAL RUPTURE AND SEALING MATERIAL TEARING OCCUR SUBSTANTIALLY SIMULTANEOUSLY DURING PULLING OF SAID TAB.