Tamperproof container closure

Claim 1

IN COMBINATION, (A) A CONTAINER HAVING A DISPENSING END, (B) A CAP ON SAID CONTAINER, (C) SAID CAP BEING OF FRANGIBLE MATERIAL AND HAVING A COLLAR PORTION IN ENCIRCLING RELATION TO SAID DISPENSING END, (D) MEANS ON SAID CAP COLLAR AND SAID DISPENSING END OF THE CONTAINER RETAINING SAID CAP IN CLOSING RELATION TO SAID DISPENSING END, (E) SAID COLLAR PORTION HAVING A PERIPHERAL FIRST WALL EXTENDING AXIALLY OUTWARDLY FORM THE UPPER END OF THE CONTAINER NECK AND A SECOND WALL CONNECTED TO THE FIRST WALL AND EXTENDING RADIALLY INWARDLY WITH RESPECT TO SAID FIRST WALL IN AXIALLY OUTWARDLY SPACED RELATION TO SAID DISPENSING END OF SAID CONTAINER AND SAID SECOND WALL TERMINATING AT ITS INNER EDGE IN A DOME PORTION, (F) A FRACTURE LINE IN SAID INWARDLY EXTENDING WALL AND EXTENDING AROUND THE CAP SO THAT IMPACT AND PRESSURE ON SAID DOME PORTION WILL BREAK THE CAP ALONG SAID FRACTURE LINE AND MOVE SAID DOME PORTION TOWARD SAID DESPENSING END AND PERMIT REMOVAL OF THE DOME PORTION FOR ACCESS TO THE DISPENSING END OF THE CONTAINER, (G) SAID FRACTURE LINE HAVING CIRCUMFERENTIALLY SPACED PORTIONS OF DIFFERENT RADIALLY OUTWARD SPACING FROM SAID DOME PORTION DEFINING LUGS ON THE DOME PORTION AND COLLAR, (H) SAID LUGS BEING ENGAGEABLE AFTER FRACTURE FOR SECURING THE DOME PORTION ON THE COLLAR PORTION IN CLOSING POSITION.