Patent ID: 8430257

Claim:
A vessel comprising: a cylindrical section coaxially disposed about a central axis of the vessel, the cylindrical section comprising an inside vessel surface, an outside vessel surface opposing the inside vessel surface, an upper end region circumscribing a vessel opening, and a lower end region axially spaced from the upper end region; a bottom section disposed at the lower end region; a flange coaxially disposed about the central axis, the flange comprising a main flange portion extending radially outward from the outside vessel surface at the upper end region, and a bottom surface facing generally toward the lower end region and perpendicular to the inside vessel surface, wherein the bottom surface lies in a horizontal plane and is entirely coplanar with the horizontal plane; and a shoulder coaxially disposed about the central axis in the upper end region, the shoulder extending radially outward from the outside vessel surface and located axially between the flange and the lower end region, the shoulder comprising an outside shoulder surface concentric with the inside vessel surface relative to the central axis.