Patent ID: 8870006

Claim:
A pressure-responsive container comprising: a lower portion including an enclosed base; an upper portion including a dome and a finish; and a generally cylindrical body portion extending vertically along a longitudinal axis between the lower portion and the upper portion, the body portion including an upper sidewall and a lower sidewall, the body portion further comprising: at least one circumferential rib disposed between the upper and lower sidewalls, the rib comprising: a single, substantially straight upper wall, wherein an entire length of said upper wall defines a first angle less than 35 degrees with respect to a horizontal reference line that is transverse to the longitudinal axis; a curved upper transition extending from said upper wall to said upper sidewall, said curved upper transition having a single radius of curvature between said upper wall and said upper sidewall; a single, substantially straight lower wall, wherein an entire length of said lower wall defines a second angle less than 35 degrees from the horizontal reference line; a curved lower transition extending from the lower wall to the lower sidewall, said curved lower transition having a single radius of curvature between said lower wall and said lower sidewall; and a curved central portion extending between the upper wall and the lower wall; wherein the substantially straight upper wall and the substantially straight lower wall are adapted to hinge with respect to each other in response to a vacuum created inside the container such that a height of the container is reduced while the body portion retains a substantially cylindrical shape.