Footed hot-fill container
AssigneeConstar Plastics Inc.
InventorsDavid A. Brunson, Stephen R. Lynn
Life of this patent
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AssigneeConstar Plastics Inc.
InventorsDavid A. Brunson, Stephen R. Lynn
Estimating the term…
A blow-molded container of thermoplastic resin has a hollow body with a generally cylindrical side wall portion rotationally symmetric about a longitudinal axis of the container. A shoulder portion integrally joins the side wall portion to a finish. An integral base merging with the side wall is defined by an outer surface comprising a plurality of downward projections separated from each other by generally arcuate segments extending essentially from the cylindrical side wall to the longitudinal axis of the container. The shoulder and sidewall portions are tempered during formation of the container to withstand hot filling at a temperature of at least about 170.degree. F. and subsequent introduction of a cryogenic liquid gas to provide an initial pressurization of at least 20 psi at the fill temperature.
A blow-molded container of thermoplastic resin having a finish and a hollow body with a generally cylindrical tempered side wall portion rotationally symmetric about a longitudinaly axis of the container, said container comprising a tempered shoulder portion integrally joining the tempered side wall portion to the finish, the tempered shoulder and the tempered sidewall portions being thermostabilized so as to relax the residual stresses therein to withstand hot filling, and a non-tempered integral base merging with the tempered side wall, the non-tempered base being defined by an outer surface comprising a plurality of non-tempered downward projections separated from each other by generally arcuate segments extending essentially from the cylindrical tempered side wall to the longitudinal axis of the container, a radially outwardly and upwardly curved non-tempered portion defining the lower most extent of the non-tempered downward projections, and an inclined non-tempered outer wall portion located between the cylindrical tempered side wall and the radially outwardly and upwardly curved non-tempered portion.
Dependencies are inferred from the claim text.