Plastic bottle, has base with re-entrant concave central part surrounded by annular part having hollow annular sectors joined to container sidewall

摘要

A plastic container has a base with a re-entrant concave central part connected by a surrounding annular part to a sidewall. The annular part has annular sectors forming hollow zones. The sectors join to the sidewall. An Independent claim is included for a mould for making the above container has a convex surface for forming the central part of the base and protrusions for forming the annular sectors.