Freshness and tamper monitoring closure

A freshness and tampering indicator forming a portion of a closure and container having an outside wall and comprising,

• a circumferential pair of opposed conical sidewalls in the outside wall forming a bellow in the relaxed state, said conical sidewalls extending to at least one fold ring spaced from the outside wall and said conical sidewalls joined to the outside wall by fold rings,
• one of said conical sidewalls flexing from the relaxed to the compressed state to provide an overcentering of the bellow thereby providing a latching of the bellow, said latching of the bellow retained only when the fluid pressure inside the container and closure differs a prescribed amount from the outside fluid pressure.

A freshness and tampering indicator forming a portion of a closure and container having an outside wall comprising,

• a circumferential conical sidewall forming a portion of the outside wall,
• a pair of fold rings joining the conical sidewall to the outside wall, said fold rings retaining substantially fixed diameters as said conical sidewall is flexed from the unfolded to the folded position wherein in said folded position the outside wall portions beyond the conical sidewall overlap.

A collapsible freshness and tampering indicator comprising a substantially cylindrical sidewall and a top joined thereto,

• the improvement comprising at least a portion of said sidewall formed into at least one conical section extending therearound, said conical section joined by fold rings to the sidewall, and
• said fold rings retaining substantially fixed diameters and said conical section flexing from the unfolded to the folded position to provide an overcentering of the conical section during folding thereby latching the conical section in the collapsed position.