Patent ID: 8667662

Claim:
A method of manufacturing a double-walled container, said method comprising the steps of: drawing and ironing a single piece of material in a cylindrical shape, including a base and side walls, said base including a circumferential concave portion extending circumferentially around said base, a circumferential leg protruding from said circumferential concave portion and disposed radially inward from said concave portion, and a dome-shaped panel spanning between said circumferential leg; securing a top to said single piece of material, thereby forming an inner container; drawing and ironing a second, single piece of material, forming an outer container having a cylindrical side wall and a base, said base of said outer container including a circumferential concave portion extending circumferentially around said base, a circumferential leg protruding from said circumferential concave portion and disposed radially inward from said concave portion, and a dome-shaped panel spanning between said circumferential leg; providing an upper transition portion on said outer container by roll forming an upper end of said cylindrical sidewall; and placing said outer container over said inner container by press fitting, wherein said upper transition portion of said outer container contacts said cylindrical side wall of said inner container.