Patent ID: 7703618

Claim:
A thermoplastic container manufactured by blow molding or stretch-blow molding a heated preform, this container being intended to contain a still liquid; wherein said container has a base comprising: a concave dome with an outward-facing concavity; a substantially planar peripheral annular seating provided around said concave dome and adapted for the container to rest on a support; several grooves radiating from a central region of said concave dome and intersecting said annular seating; wherein each groove, in a region of each groove that intersects with the annular seating, has a portion of increased width; wherein each groove, in the portion of increased width, has two edges which are curved with relatively large radii of curvature and with respective concavities facing each other; and wherein each groove has: a depth (p 1 ) which is substantially constant from the central region of the concave dome as far as approximately the portion of the groove having an increased width; a depth (p 2 ) which is reduced in the portion of the groove having an increased width; and a depth (p 3 ) which gradually decreases on a heel of the base.