Abstract: Base includes an outer support wall, a support surface extending inwardly from the outer support wall and defining a reference plane, an inner support wall extending upwardly from the support surface, a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane, a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane, an intermediate surface extending radially inward from the second radiused portion, the intermediate surface including a linear portion and an intermediate radiused portion, a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane, and a central portion disposed proximate the third radiused portion.

Abstract: Base includes an outer support wall, a support surface extending inwardly from the outer support wall and defining a reference plane, an inner support wall extending upwardly from the support surface, a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane, a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane, an intermediate surface extending radially inward from the second radiused portion, the intermediate surface including a linear portion and an intermediate radiused portion, a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane, and a central portion disposed proximate the third radiused portion.

Abstract: A blow molded plastic container is provided. The container has a body section having a substantially non-circular cross-sectional shape, the body section having an enclosed bottom portion that forms a bottom end of the container and substantially flat side portions extending upwardly from the bottom end; a finish defining an opening; and a dome extending from the body section to the finish. The dome includes at least one stiffening structure formed by an inwardly indented, vertically extending groove.

Abstract: Base includes an outer support wall, a support surface extending inwardly from the outer support wall and defining a reference plane, an inner support wall extending upwardly from the support surface, a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane, a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane, an intermediate surface extending radially inward from the second radiused portion, the intermediate surface including a linear portion and an intermediate radiused portion, a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane, and a central portion disposed proximate the third radiused portion.

Abstract: Plastic pressure container including a main body portion, a finish portion, and a closure assembly. The main body portion defines an interior space. The finish portion is unitary with the main body portion and defines a mouth in communication with the interior space. The finish portion has an inner surface, an outer surface and an upper rim proximate the mouth. The inner surface has an inner undercut defined therein proximate the upper rim. The outer surface has an outer undercut defined therein proximate the upper rim. The closure assembly is mounted to the finish portion in engagement with both the inner undercut and the outer undercut.

Abstract: Methods and devices for manufacturing plastic preforms and plastic containers are provided. Methods of manufacturing a plastic preform having an inner undercut include forming a preform of plastic in amorphous state and inserting a plug within the mouth of the preform. The plug includes an upper plug member and an expandable element, the expandable element having an initial outer diameter in plan view with the plug in an initial condition and a deployed outer diameter in plan view with the plug in a deployed condition. Methods further include deploying the plug to the deployed condition with the expandable element positioned to engage a side wall proximate the inner undercut and crystallizing the plastic of the preform along the finish portion.

Abstract: A plastic pressure container including a main body portion and a finish portion defining a mouth, the finish portion has an inner surface, an outer surface and an upper rim proximate the mouth. The inner surface has an inner undercut defined therein proximate the upper rim, and the inner undercut has a curved shape in cross-section. The outer surface has an outer undercut defined therein proximate the upper rim, and the outer undercut has a polygonal shape in cross-section. The inner undercut defines a first depth relative to an inner diameter D2 proximate the mouth and the outer undercut defines a second depth relative to an outer diameter D3 proximate the mouth. The second depth is different than the first depth.

Abstract: Base includes an outer support wall, a support surface extending inwardly from the outer support wall and defining a reference plane, an inner support wall extending upwardly from the support surface, a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane, a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane, an intermediate surface extending radially inward from the second radiused portion, the intermediate surface including a linear portion and an intermediate radiused portion, a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane, and a central portion disposed proximate the third radiused portion.

Abstract: A blow molded plastic container is provided. The container has a body section having a substantially non-circular cross-sectional shape, the body section having an enclosed bottom portion that forms a bottom end of the container and substantially flat side portions extending upwardly from the bottom end; a finish defining an opening; and a dome extending from the body section to the finish. The dome includes at least one stiffening structure formed by an inwardly indented, vertically extending groove.

Abstract: A plastic pressure container including a main body portion and a finish portion defining a mouth, the finish portion has an inner surface, an outer surface and an upper rim proximate the mouth. The inner surface has an inner undercut defined therein proximate the upper rim, and the inner undercut has a curved shape in cross-section. The outer surface has an outer undercut defined therein proximate the upper rim, and the outer undercut has a polygonal shape in cross-section. The inner undercut defines a first depth relative to an inner diameter D2 proximate the mouth and the outer undercut defines a second depth relative to an outer diameter D3 proximate the mouth. The second depth is different than the first depth.

Abstract: Plastic pressure container including a main body portion, a finish portion, and a closure assembly. The main body portion defines an interior space. The finish portion is unitary with the main body portion and defines a mouth in communication with the interior space. The finish portion has an inner surface, an outer surface and an upper rim proximate the mouth. The inner surface has an inner undercut defined therein proximate the upper rim. The outer surface has an outer undercut defined therein proximate the upper rim. The closure assembly is mounted to the finish portion in engagement with both the inner undercut and the outer undercut.

Abstract: Plastic pressure container including a main body portion, a finish portion, and a closure assembly. The main body portion defines an interior space. The finish portion is unitary with the main body portion and defines a mouth in communication with the interior space. The finish portion has an inner surface, an outer surface and an upper rim proximate the mouth. The inner surface has an inner undercut defined therein proximate the upper rim. The outer surface has an outer undercut defined therein proximate the upper rim. The closure assembly is mounted to the finish portion in engagement with both the inner undercut and the outer undercut.

Abstract: A plastic container and closure, and system and method of making the same. Container can include a solid bottom end, an outer sidewall extending from solid bottom end, a shoulder portion extending from outer sidewall, and neck portion extending from shoulder portion, forming an open end of container. Solid bottom end includes a circumferential heel portion having a plurality of radially asymmetrical projections and recesses disposed on an outer periphery of the heel portion, the plurality being configured to increase heel portion rigidity while maintaining substantially uniform material thickness. Shoulder portion forms an angle with a plane perpendicular to the container central axis. At an angle of 50° a desirable failure mode may be achieved where the yield strength of the shoulder portion is balanced against that of the heel portion and the outer sidewall to maximize the top load strength of the container.

Abstract: A stackable container assembly that is particularly suited for packaging heavy bulk products such as paint includes a container having a main body and a removable lid having an upstanding rim portion that has an upper surface. The container has a flexible bottom portion that has a lower surface that includes at least one support surface for supporting the container assembly on an underlying horizontal surface. The lower surface further includes at least one projection that is disposed radially inwardly from the support surface. The flexible bottom portion is advantageously configured so that the projection will flex radially downwardly and outwardly into a position that is adjacent to an upstanding rim portion of an underlying container assembly when the container assembly is stacked on top of another container assembly. This ensures accurate registration and positioning of the container assemblies during stacking.

Abstract: A plastic container and closure, and system and method of making the same. Container can include a solid bottom end, an outer sidewall extending from solid bottom end, a shoulder portion extending from outer sidewall, and neck portion extending from shoulder portion, forming an open end of container. Solid bottom end includes a circumferential heel portion having a plurality of radially asymmetrical projections and recesses disposed on an outer periphery of the heel portion, the plurality being configured to increase heel portion rigidity while maintaining substantially uniform material thickness. Shoulder portion forms an angle with a plane perpendicular to the container central axis. At an angle of 50° a desirable failure mode may be achieved where the yield strength of the shoulder portion is balanced against that of the heel portion and the outer sidewall to maximize the top load strength of the container.

Abstract: A plastic container and closure and method of making the same. The container can include a solid bottom end, an outer sidewall extending from the solid bottom end, and a neck portion extending from the outer sidewall to create an open end of the container. The neck portion may have a spout portion having an aperture formed therein. The spout portion can be inverted to form a flange receptacle. The closure can include a sealing portion which includes a first receptacle, a spring portion that includes a second receptacle, and a planar center area configured in the center of the closure and extending inward from the spring portion. The container may be filled with a product and the closure secured to the container, over the open end, to create a primary seal and a secondary seal. When the closure is secured to the container, the spring portion can exert a sealing pressure against the neck portion of the container to create the primary seal.

Abstract: A stackable container assembly that is particularly suited for packaging heavy bulk products such as paint includes a container having a main body and a removable lid having an upstanding rim portion that has an upper surface. The container has a flexible bottom portion that has a lower surface that includes at least one support surface for supporting the container assembly on an underlying horizontal surface. The lower surface further includes at least one projection that is disposed radially inwardly from the support surface. The flexible bottom portion is advantageously configured so that the projection will flex radially downwardly and outwardly into a position that is adjacent to an upstanding rim portion of an underlying container assembly when the container assembly is stacked on top of another container assembly. This ensures accurate registration and positioning of the container assemblies during stacking.

Abstract: A plastic container and closure and method of making the same. The container can include a solid bottom end, an outer sidewall extending from the solid bottom end, and a neck portion extending from the outer sidewall to create an open end of the container. The neck portion may have a spout portion having an aperture formed therein. The spout portion can be inverted to form a flange receptacle. The closure can include a sealing portion which includes a first receptacle, a spring portion that includes a second receptacle, and a planar center area configured in the center of the closure and extending inward from the spring portion. The container may be filled with a product and the closure secured to the container, over the open end, to create a primary seal and a secondary seal. When the closure is secured to the container, the spring portion can exert a sealing pressure against the neck portion of the container to create the primary seal.

Abstract: A container having a grip ring. The grip ring is located between a dome portion and a body portion of the container and has an inset grip surface for receiving a thumb and fingers. The grip ring is located and sized relative to the dome and body portions, such that, when the container is grasped about the grip ring, the container contents can be poured in a balanced and facile manner. In addition, the location and configuration of the grip ring provides the container with circumferential hoop strength which resists unwanted ovalization distortion of the dome and body portion of the container.