Abstract: A reinforcing structure for a door includes a first region constructed from a first grade of corrugated paperboard and second and third regions constructed from a second grade of corrugated paperboard. The first region may be expandable and the second and third regions may be non-expandable. A method for installing the reinforcing structure in a door having a frame and two opposed skins with recessed areas includes installing the reinforcing structure on the surfaces of the recessed areas between the skins.

Abstract: The invention relates to a corner protector of a window having a frame with an integral flange. The corner protector comprises a plurality of corrugated layers. The corrugated layers form two portions. A first portion is configured to be attached to a first portion of a window frame. A second portion is configured to be attached to a second portion of a window frame, wherein a corner is located intermediate the first portion and the second portion of the window frame. A free portion of the first portion of the member extends beyond the corner and overlaps the second portion of the member.

Abstract: An improved hollow paneled door construction using an improved void filler that is expandable and which has components of a specific thickness except for relieved sections of reduced thickness to overlie the panels between the doorskins.

Abstract: A blow-molded plastic container having a body comprising a neck portion, a generally cylindrical sidewall portion and a bottom structure. The bottom structure comprises a central portion, a plurality of ribs extending downwardly from the bottle sidewall to the central portion, and a plurality of feet extending below the central portion from the sidewall portion. The ribs are defined by an upper curvilinear surface and, in cross-section are of an substantially U-shape having a relatively tight radius, the upper rib surfaces lying on a generally hemispherical curvature in the interior of said container.

Abstract: A container of blow-moulded oriented thermoplastic material includes a base structure comprising a convex annular surface (which may be divided into a plurality of feet (118) by radial webs (112) and a central re-entrant portion (116). In blow-moulding the container, a moulded preform is enclosed within a mould heated, and stretched such that its bottom surface impinges upon a projecting surface of the mould bottom corresponding to the topmost surface (158) of the re-entrant portion. After blow-moulding, the material of the re-entrant portion (116) remains unoriented and relatively thick in comparison to the material of the remainder of the base. The unoriented material in the base is substantially confined to the re-entrant portion (116) which itself is strengthened by its relatively thick walls and the base thus exhibits improved creep and stress cracking properties.