Duct section, system and method for constructing same
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United States of America Patent
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Jul 3, 2012
Grant Date -
Feb 18, 2010
app pub date -
Jan 31, 2008
filing date -
Jan 31, 2007
priority date (Note) -
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Abstract
A duct section and system, including a laminated shroud, acting as a secondary duct, for aerospace and other applications, and a method for constructing same. The duct structure incorporates a metallic primary duct tube, with a laminated shroud surrounding the primary duct tube and separated therefrom by an annular gap. The laminated shroud includes a metallic inner layer and a polymeric outer layer. Preferably, the thin metallic layer is a corrosion resistant material such as corrosion resistant stainless steel or titanium. In one embodiment of the invention, the outer polymeric layer is a polyimide material, such as polyimide resin-impregnated fiberglass cloth.
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