Container structure for removal of vacuum pressure

1. A container having a longitudinal axis, and comprising:

an upper portion including an opening into the container;

a sidewall portion extending from the upper portion to a lower portion, the lower portion including a base; and

a pressure panel located in the lower portion substantially transversely to the longitudinal axis, the pressure panel being movable substantially along the longitudinal axis between an initial position and an inverted position to compensate for a change of pressure induced within the container;

wherein the pressure panel comprises an initiator portion and a control portion, the initiator portion being adapted to move in response to the change of pressure to cause the control portion to invert, and wherein the initiator portion is located closer to the longitudinal axis than is the control portion.

2. The container of claim 1 , wherein the pressure panel is adapted to move from the initial position to the inverted position under an externally applied mechanical force.

3. The container of claim 1 , wherein the pressure panel is adapted to move from the initial position to the inverted position in response to internal vacuum forces within the container.

4. The container of claim 1 , wherein the initiator portion and the control portion define a substantially continuous curve when viewed in a cross-sectional plane extending through the longitudinal axis.

5. The container of claim 1 , wherein when in the initial position, the initiator portion defines a first angle of inclination with respect to the longitudinal axis and the control portion defines a second angle of inclination with respect to the longitudinal axis, with the second angle being smaller than the first angle.

6. The container of claim 1 , wherein when in the initial position, at least a portion of the pressure panel defines an angle of inclination with respect to a plane orthogonal to the longitudinal axis that is greater than about 15 degrees.

7. The container of claim 1 , further comprising a hinge structure connecting the pressure panel to the lower portion.

8. The container of claim 1 , wherein the pressure panel further comprises a centrally located push-up portion.

9. The container of claim 1 , wherein the initiator portion comprises a centrally located push-up portion.

10. The container of claim 9 , wherein the push-up portion is configured to receive a mechanical pusher.

11. A container having a longitudinal axis, and comprising:

an upper portion including an opening into the container;

a sidewall portion extending from the upper portion to a lower portion, the lower portion including a base;

a pressure panel located in the lower portion substantially transversely to the longitudinal axis, the pressure panel being movable substantially along the longitudinal axis between an initial position and an inverted position to compensate for a change of pressure induced within the container; and

a hinge structure connecting the pressure panel to the lower portion;

wherein the pressure panel moves from the initial position to the inverted position in response to internal vacuum forces developed within the container as a result of cooling of liquid contents within the container, wherein the pressure panel comprises an initiator portion and a control portion, the initiator portion being adapted to move in response to the internal vacuum forces to cause the control portion to invert, and wherein the initiator portion is located closer to the longitudinal axis than is the control portion.

12. The container of claim 11 , wherein the initiator portion comprises a centrally located push-up portion.

13. The container of claim 12 , wherein the push-up portion is configured to receive a mechanical pusher.