Patent ID: 8096434

Claim:
A container made of a thermoplastic, manufactured by blow molding or stretch blow molding of a heated perform, said container having: a bottom which is domed, so as to have a general shape of a spherical cap which comprises a concavity facing an outside of the container, and defines an annular seat which extends along a periphery of the bottom, said bottom having reinforcing impressions projecting toward an inside of the container and radiating around a central indentation formed in the bottom, each of said reinforcing impressions comprising: domed trapezoidal segments of an approximately trapezoidal general shape with a short side located toward a center of the bottom; a concavity facing toward an inside of the concavity of the spherical cap, an arch that forms an upper surface of each of the domed trapezoidal segments, the arch starting at the annular seat and extending to the central indentation as a single continuous concave surface, and two side walls which oppose one another and extend from the bottom to the upper surface of the domed trapezoidal segments, wherein each wall has an upper edge which is continuously smoothly curved with a curvature of the same sign along an entire length of the upper edge and extends from the annular seat to the short side of a corresponding domed trapezoidal segment, each arch extends between the upper edges of corresponding two side walls, and the concavities of said reinforcing impressions and the concavity of said spherical cap form a double structure with a double concavity of the same orientation.