Container with vapor lock closure

Claim 1

A container comprising a container body; and a plastic closure; said container body having a base, an annular side wall with inner and outer surfaces, and an upper edge surface; said side wall including an annular tapered ridge extending down from said upper edge surface; said upper edge surface having inner and outer rounded corners; said ridge having an upper ridge surface extending downwardly and outwardly from said outer corner of said upper edge and a lower ridge surface extending downwardly and inwardly from said upper ridge surface to said outer surface of said side wall; and a rounded third corner between said upper and lower ridge surfaces; said closure having an inverted, generally U-shaped annular groove and a closure guide extending outwardly and downwardly from the lower end of the outer wall of said groove; said groove having an inner wall, an upper wall, an outer wall and a re-entrant wall to define respectively first, second, third and fourth contact surfaces, said surfaces being sized and shaped to sealingly contact said container body at said inner wall surface, said upper edge surface, said upper ridge surface and said lower ridge surface, respectively; said second contact surface being slightly smaller than said upper edge to cause said first and third contact surfaces to clamp said side wall therebetween; said third contact surface being slightly smaller than said upper ridge surface to cause said fourth contact surface and said lower ridge surface to generate wedging forces therebetween and drive said closure into tight abutment with said container at said four contact surfaces, securing said closure to said container; said inner, outer and third rounded corners of said container body being slightly spaced from corresponding corners of said groove of said closure, when said closure is mounted on said container body, to provide a space for adjustment of said groove on said edge of said container body and to assure a sealing relationship between closure and container body at all four of said contact surfaces; said closure guide including an inclined guide wall portion extending downwardly and outwardly from said groove and also including a vertical wall portion extending downwardly from said inclined guide wall portion, the inner surface of said vertical wall portion being radially outward of the outer surface of said outer wall portion of said groove; said closure also including a plurality of substantially vertical fins, each of said fins extending radially outward from said outer wall portion of said groove and from said guide wall portion, each of said fins extending upwardly from the outer surface of said guide wall portion, each of said fins having an upper surface positioned below the upper edge of said outer wall portion of said groove, said upper edge of said fins contacting the lower edges of said vertical wall portion of said closure guide when a plurality of said closures are stacked, said upper edges of said fins providing the sole support for successive closures being stacked.