Pipe wall segment and pipe having sidewall
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 17, 1998
Grant Date -
N/A
app pub date -
Oct 25, 1995
filing date -
Apr 30, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved pipe construction is disclosed having an inner and outer surface, intermediate walls having a top and bottom, and a plurality of primary internal cells. Each of the primary internal cells has a cell surface wall, collapsible ribs attached to the intermediate walls, collapsible apertures positioned on opposite sides of the intermediate walls and apertures, and internal flanks. Each of the collapsible apertures has an inner wall surface, with each inner wall surface having a deformable surface portion. Each of the end apertures is positioned between the collapsible apertures and primary internal cells. Each of the end apertures has an inner wall surface. The internal flanks are positioned intermediate the end apertures and the collapsible apertures. A method of forming the pipe of this structure is also disclosed.
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