Plastic bottle with champagne base

A molded plastic bottle having a sidewall and a bottom structure closing the container at a lower end portion of the sidewall, the bottom structure having an outside surface rotationally symmetric about a longitudinal axis of the bottle, the outside surface comprising:

• a convex heel having an upper margin of diameter D integrally formed with the lower end portion of the sidewall and a lower margin defining an outer portion of a standing ring for supporting the bottle on any underlying surface, the standing ring outer portion having a vertical inside radius of curvature of between about 0.045 D and 0.095 D, and
• a central concavity including a first surface having a lower most portion defining an inner portion of the standing ring and a second surface having an outer margin spaced uniformly inward from the standing ring and integrally formed with the first surface, the second surface being downwardly convex and including a lowermost point coincident with the longitudinal axis and spaced from any underlying supporting surface, the first surface having a vertical curvature radius of at least about 0.8 of D, the standing ring inner portion and outer portion intersecting in an abrupt edge defining a circle lying in a plane normal to said axis, the inner portion of the standing ring being inclined with respect to the plane at an angle of between about 30° and 50°.

A molded plastic bottle having a base with an outside surface rotationally symmetric about a longitudinal axis of the bottle including a convex heel and a central concavity separated from each other by a standing ring for supporting the bottle on any underlying surface, the convex heel having an upper margin of diameter integrally formed with the sidewall of the bottle and a lower margin defining an outer portion of the standing ring, the central concavity including a first surface having a lower most portion defining an inner portion of the standing ring and a second surface having an outer margin spaced uniformly inward from the standing ring and integrally formed with the first surface, the second surface being downwardly convex and including a lowermost point coincident with the longitudinal axis of the bottle that is spaced from any underlying supporting surface, the standing ring inner portion and outer portion intersecting in an abrupt edge with the inner portion of the standing ring generally being inclined with respect to said plane at an angle of between about 30° and 50°.