Patent ID: 7017772

Claim:
A pressure container comprising: a. axially extending side walls formed of plastic extending between a top end and a bottom end, wherein the side walls include at their top end a top bead that is thicker than the adjacent portion of the side walls and extends radially outward therefrom; b. a metal top attached at a top seam in pressure-containing relation to the top end of the side walls, the top seam being between the metal top and top end of the side walls; and c. a metal bottom attached at a bottom seam in pressure-containing relation to the bottom end of the side walls; wherein the side walls have at their top end a necked-in portion contacting an end of the metal top and extending to the top seam and a side wall maximum diameter below the necked-in portion, the necked-in portion extending radially inwardly from the side wall maximum diameter sufficiently that the top seam is entirely inward of the side wall maximum diameter, and the end of the metal top is also entirely inward of the side wall maximum diameter and below the top bead; and wherein the side walls extend radially inwardly for no more than the amount that decreases the side wall diameter by 20 percent of the side wall maximum diameter.