Patent ID: 7568589

Claim:
A container having a vertical axis and comprising a base and lid formed of a sheet of plastic, the base and lid each having first and second sides and the second sides of the base and lid are latched together to prevent initial opening thereat, said container forming an arrangement at said first side of the base and lid that requires a large lift force on the lid to initially separate the lid first side from the base first side, but after the initial separation followed by closing of the lid it requires a smaller lift force to separate the lid first side from the base first side, wherein: at said first side, said lid and base are joined by a join line in an integral portion of said plastic where said plastic is folded, with said join line being weakened to be less resistant to tearing along said join line than along the rest of the plastic sheeting, to facilitate tearing at said join line; at said first side of said lid and base, said lid has a projection that can be grasped, to lift said lid first side with sufficient force to tear apart said lid and base along said join line; said base and lid have adjacent flat rims lying beside said join line and said join line has a pair of join line portions spaced apart along said join line where said lid and base are not joined; said projection comprising a radially-projecting lid tab that lies in said space between join line portions, said lid tab projecting radially outward beyond said join line, to enable said lid tab to be grasped to lift said lid first side.