Hydraulic and earth engineering – Fluid control – treatment – or containment – Flow control
Reexamination Certificate
2006-11-21
2006-11-21
Lagman, Frederick L. (Department: 3673)
Hydraulic and earth engineering
Fluid control, treatment, or containment
Flow control
C405S124000
Reexamination Certificate
active
07137756
ABSTRACT:
A box culvert and gasket assembly is provided that enables fluid-tight bell-and spigot joints to be formed between abutting ends of box culverts. The joints according to the assembly of the present invention can remain fluid-tight up to at least 13 psi of water pressure. The gasket is preferably a one-piece, endless rubber gasket that is applied over the end of a spigot that is rectangular in end elevation. The corners of the rectangular spigot are rounded to enable the gasket to extend continuously over the corner without the need for 45° cuts and splices. Preferably, the gasket is made from a single elongate gasket piece that is cut to size and that has ends that are bonded together via a butt vulcanization technique. A storm drain and sewer assembly and a method of forming a fluid-tight bell-and spigot joint are also provided.
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Hail Mary Rubber Co., Inc., “Rubberman-BW”, 4 page brochure, (date unknown).
Hail Mary Rubber Co., Inc.
Howson and Howson
Lagman Frederick L.
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